CN116026411A - Application of photoelectric dual-mode flexible fiber in pressure-temperature sensor - Google Patents

Abstract

The invention discloses the application of a photoelectric dual-mode flexible fiber in a pressure-temperature sensor. The preparation method of the photoelectric dual-mode flexible fiber includes the following steps: a polymerizable hydrogen bond donor, a non-polymerizable hydrogen bond donor, a hydrogen bond acceptor The body is mixed in proportion to obtain a deep eutectic solvent; a photoinitiator or a photoinitiator and a crosslinking agent are added to the deep eutectic solvent to obtain a spinning precursor for the optical fiber core layer; a photoinitiator and a crosslinking agent are added to the deep eutectic solvent The spinning precursor solution of the optical fiber cladding is obtained by combining the agent; the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding are extruded according to a certain advancing speed; Modular flexible fibers. The photoelectric dual-mode flexible fiber has excellent electrical and optical signal sensing capabilities, and when it is applied in a pressure-temperature sensor, it can simultaneously feed back two external stimulation signals of pressure and temperature, and the mutual influence between the two signals is small .

Description

Application of photoelectric dual-mode flexible fiber in pressure-temperature sensor

technical field

The invention relates to the field of flexible optical fibers, in particular, the invention relates to the application of photoelectric dual-mode flexible fibers in pressure-temperature sensors.

Background technique

Inspired by the fact that the human epidermis can distinguish different mechanical and thermal stimuli, sensors that can feed back multiple sensing signals in an integrated manner are increasingly favored by researchers. However, when multiple stimulus signals are presented using a single sensing unit, the different signals often interfere with each other, reducing sensing accuracy, and calibration is required whenever the usage conditions change, so fabricating a sensor with multiple stimulus responses remains a challenge. . Conventional 3D and 2D sensors are relatively bulky, and the mismatch between the material and the modulus of the skin can cause discomfort during monitoring. The new one-dimensional sensor can integrate multiple responses onto a single fiber ranging from tens of micrometers to several millimeters, and can easily adapt to deformations such as stretching, twisting, and bending. What's more, it can be woven on the clothes that people wear every day, which has excellent air permeability, stretchability, high resistance to damage and not easy to fall off. Therefore, it is of great significance to develop a one-dimensional sensor that can feed back multiple sensing signals.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art, and to provide an application of a photoelectric dual-mode flexible fiber in a pressure-temperature sensor. The photoelectric dual-mode flexible fiber of the present invention has excellent electrical and optical signal sensing capabilities. Its application in the pressure-temperature sensor can feed back two external stimulation signals of pressure and temperature at the same time, and the mutual influence between the two signals is small.

The scheme of the present invention is as follows:

An application of a photoelectric dual-mode flexible fiber in a pressure-temperature sensor, the preparation method of the photoelectric dual-mode flexible fiber comprises the following steps:

(1) The polymerizable hydrogen bond donor, non-polymerizable hydrogen bond donor, and hydrogen bond acceptor are according to the molar ratio (1~3): (0.5~2.5):

1 Mix, mix at 60-90°C to form a clear and transparent deep eutectic solvent, and cool to room temperature;

(2) Add photoinitiator 1 or photoinitiator 1 and crosslinking agent 1 in the deep eutectic solvent, stir evenly, obtain the spinning precursor liquid of optical fiber core layer, wherein the consumption of photoinitiator 1 is deep eutectic solvent 0.4～0.6wt% of the crosslinking agent 1 is 0～0.2wt% of the deep eutectic solvent;

Add photoinitiator 2 and crosslinking agent 2 into the deep eutectic solvent, stir evenly, and obtain the spinning precursor solution of optical fiber cladding, wherein the amount of photoinitiator 2 is 0.05～0.2wt% of the deep eutectic solvent, crosslinking The dosage of agent 2 is 0.4～0.6wt% of the deep eutectic solvent;

(3) Fill the spinning precursor of the optical fiber core layer and the spinning precursor of the optical fiber cladding into the syringe pump 1 and the syringe pump 2 respectively, and the ratio of the syringe pump 1 and the syringe pump 2 is 1:2～2 according to the propulsion rate: 1 Extrude to the double-layer coaxial spinning head, and the needle of the spinning head is connected to the silicone tube;

(4) The spinning solution flowing down vertically is irradiated and solidified by the ultraviolet light region to obtain a photoelectric dual-mode flexible fiber, which is wound and collected by the wire collecting device.

In one of the embodiments, the polymerizable hydrogen bond donor is one or more of acrylic acid, methacrylic acid, maleic acid, and acrylamide, and the hydrogen bond acceptor is choline chloride, anhydrous beet One or more of alkali, betaine monohydrate, ammonium chloride, methyltriphenylphosphonium bromide, benzyltriphenylphosphorus chloride, N,N-diethylethanolammonium chloride, etc.

In one embodiment, the non-polymerizable hydrogen bond donor is glycerol or oxalic acid dihydrate.

In one of the embodiments, the photoinitiator 1 and the photoinitiator 2 are 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, diphenyl (2,4 , one or more of 6-trimethylbenzoyl) phosphine oxide, 2-hydroxy-2-methylpropiophenone.

In one of the embodiments, the crosslinking agent 1 and the crosslinking agent 2 are tripropylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate One or more of acrylate, neopentyl glycol diacrylate, diethylene glycol phthalate diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and the like.

In one embodiment, the optical bending sensitivity of the optoelectronic dual-mode flexible fiber is 0.043-0.088dB° ^-1 , and the electrical temperature sensitivity is 0.55-1.484%°C ^-1 .

In one of the implementation manners, the intrinsic conductivity of the core material of the photoelectric dual-mode flexible fiber is 0.001-0.08 S m ^-1 .

In one embodiment, the transparency of the photoelectric dual-mode flexible fiber is 90.1-93.2%.

In one of the implementation manners, the application includes the following steps:

(1) Take a 5-15cm photoelectric dual-mode flexible fiber and place it on the surface of the flexible substrate or implant it into the flexible substrate;

(2) Coupling the core layer at both ends of the photoelectric dual-mode flexible fiber with two fiber pigtails, one of which is connected to the laser as the transmitting end, and the other fiber pigtail is connected to the optical power meter as the receiving end ;

(3) Connect the core layer parts at both ends of the photoelectric dual-mode flexible fiber to two conductive wires respectively, and the two conductive wires are respectively connected to the positive pole and the negative pole of the digital source meter;

(4) The laser light emitted by the laser is transmitted to the optical power meter through the core layer of the photoelectric dual-mode flexible fiber as an optical signal sensing system for monitoring pressure changes; the digital source meter, the conductive wire and the core layer of the photoelectric dual-mode flexible fiber are simultaneously used as An electrical signal sensing system is used to monitor temperature changes.

In one embodiment, the flexible base is a flexible base with a thickness of 2-10 cm.

In one embodiment, the pressure-temperature sensor is a one-dimensional sensor.

Compared with the prior art, the present application has the following beneficial effects:

(1) The present invention prepares an intrinsically transparent and conductive step-type shell-core structure fiber, which has excellent electrical and optical signal sensing capabilities;

(2) The photoelectric dual-mode flexible fiber prepared by the present invention can be applied in a pressure-temperature sensor, and can simultaneously feed back two external stimulation signals of pressure and temperature, and the mutual influence between the two signals is small;

(3) The preparation method of the photoelectric dual-mode flexible fiber provided by the present invention is time-consuming, can realize continuous batch preparation, and does not involve additional organic solvents in the preparation process, no toxic gas is generated, and is safe and environmentally friendly.

Description of drawings

Fig. 1 is the AC impedance spectrum of the core material of the optoelectronic dual-mode flexible fiber prepared in Example 1.

FIG. 2 is an ultraviolet spectrum diagram of the core material of the optoelectronic dual-mode flexible fiber prepared in Example 1. FIG.

FIG. 3 is the light loss curves of the photoelectric dual-mode flexible fiber prepared in Example 1 under different bending angles.

Fig. 4 is the resistance change curve of the optoelectronic dual-mode flexible fiber prepared in Example 1 in the range of 30-70°C.

Fig. 5 is a graph showing the changes in electrical resistance and optical loss of the optoelectronic dual-mode flexible fiber prepared in Example 1 under different strain conditions.

Fig. 6 is a schematic diagram of a photoelectric dual-mode flexible fiber applied to a pressure-temperature sensor.

Fig. 7 is a diagram of electrical and optical signals corresponding to pressure and temperature stimuli when the photoelectric dual-mode flexible fiber prepared in Example 1 is applied to a pressure-temperature sensor.

Detailed ways

In order to make the application purpose, technical solution and beneficial technical effect of the present application clearer, the present application will be further described in detail below in conjunction with the examples. It should be understood that the embodiments described in this specification are only for explaining the present application, not for limiting the present application.

For brevity, only certain numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unexpressed range; and any lower limit can be combined with any other lower limit to form an unexpressed range, just as any upper limit can be combined with any other upper limit to form an unexpressed range. In addition, every point or individual value between the endpoints of a range is included within that range, although not expressly stated herein. Thus, each point or individual value may serve as its own lower or upper limit in combination with any other point or individual value or with other lower or upper limits to form a range not expressly recited.

In the description herein, it should be noted that, unless otherwise specified, "above" and "below" include the number, and "multiple" in "one or more" means two or more.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation in the present application. The following description more particularly exemplifies exemplary embodiments. At various places throughout the application, guidance is provided through a series of examples, which examples can be used in various combinations. In each instance, the lists are presented as representative groups only and should not be construed as exhaustive.

In the course of research, the inventors found that the polymerizable deep eutectic solvent with a specific composition has certain temperature sensitivity, pressure sensitivity, and photoelectric sensitivity. If its various properties can be applied to sensors that can feed back multiple sensing signals , and each sensing signal does not interfere with each other, it is expected to prepare a new sensor.

This application is made based on the discovery and research of the above problems.

The application provides an application of a photoelectric dual-mode flexible fiber in a pressure-temperature sensor. The preparation method of the photoelectric dual-mode flexible fiber includes the following steps:

(1) Mix the polymerizable hydrogen bond donor, non-polymerizable hydrogen bond donor, and hydrogen bond acceptor according to the molar ratio (1~3):(0.5~2.5):1, and mix at 60~90°C to form a clear Transparent deep eutectic solvent, cooled to room temperature;

(2) Add photoinitiator 1 or photoinitiator 1 and crosslinking agent 1 in the deep eutectic solvent, stir evenly, obtain the spinning precursor liquid of optical fiber core layer, wherein the consumption of photoinitiator 1 is deep eutectic solvent 0.4～0.6wt% of the crosslinking agent 1 is 0～0.2wt% of the deep eutectic solvent;

Add photoinitiator 2 and crosslinking agent 2 into the deep eutectic solvent, stir evenly, and obtain the spinning precursor solution of optical fiber cladding, wherein the amount of photoinitiator 2 is 0.05～0.2wt% of the deep eutectic solvent, crosslinking The dosage of agent 2 is 0.4～0.6wt% of the deep eutectic solvent;

(3) Fill the spinning precursor of the optical fiber core layer and the spinning precursor of the optical fiber cladding into the syringe pump 1 and the syringe pump 2 respectively, and the ratio of the syringe pump 1 and the syringe pump 2 is 1:2～2 according to the propulsion rate: 1 Extrude to the double-layer coaxial spinning head, and the needle of the spinning head is connected to the silicone tube;

(4) The spinning solution flowing down vertically is irradiated and solidified by the ultraviolet light region to obtain a photoelectric dual-mode flexible fiber, which is wound and collected by the wire collecting device.

In any embodiment, the polymerizable hydrogen bond donor is one or more of acrylic acid, methacrylic acid, maleic acid, and acrylamide, and the hydrogen bond acceptor is choline chloride, anhydrous betaine, One or more of betaine monohydrate, ammonium chloride, methyltriphenylphosphonium bromide, benzyltriphenylphosphorus chloride, N,N-diethylethanolammonium chloride, etc.

In any embodiment, the non-polymerizable hydrogen bond donor is glycerol or oxalic acid dihydrate.

In any embodiment, the photoinitiator 1 and photoinitiator 2 are 2-hydroxyl-4'-(2-hydroxyethoxy)-2-methylpropiophenone, diphenyl (2,4,6 -one or more of trimethylbenzoyl)phosphine oxide and 2-hydroxy-2-methylpropiophenone.

In any embodiment, the crosslinking agent 1 and crosslinking agent 2 are tripropylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate , neopentyl glycol diacrylate, diethylene glycol diacrylate phthalate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and the like.

In any embodiment, the ultraviolet light area is an irradiation area surrounded by four ultraviolet curing lamps, the distance between each ultraviolet curing lamp and the center point is 15±2cm, and the distance between the ultraviolet light area and the spinning head The distance is 20±2cm.

In any embodiment, the core material of the optoelectronic dual-mode flexible fiber has an intrinsic electrical conductivity of 0.001-0.08 Sm ^-1 . In any embodiment, the transparency of the optoelectronic dual-mode flexible fiber is 90.1-93.2%.

In any embodiment, the optical bending sensitivity of the optoelectronic dual-mode flexible fiber is 0.043-0.088dB° ^-1 , and the electrical temperature sensitivity is 0.55-1.484%°C ^-1 .

Specifically, the application includes the following steps:

(1) Take a 5-15cm photoelectric dual-mode flexible fiber and place it on the surface of the flexible substrate or implant it into the flexible substrate;

(2) Coupling the core layer at both ends of the photoelectric dual-mode flexible fiber with two fiber pigtails, one of which is connected to the laser as the transmitting end, and the other fiber pigtail is connected to the optical power meter as the receiving end ;

(3) Connect the core layer parts at both ends of the photoelectric dual-mode flexible fiber to two conductive wires respectively, and the two conductive wires are respectively connected to the positive pole and the negative pole of the digital source meter;

(4) The laser light emitted by the laser is transmitted to the optical power meter through the core layer of the photoelectric dual-mode flexible fiber as an optical signal sensing system for monitoring pressure changes; the digital source meter, the conductive wire and the core layer of the photoelectric dual-mode flexible fiber are simultaneously used as An electrical signal sensing system is used to monitor temperature changes.

Further, the flexible base is a flexible base with a thickness of 2-10 cm.

Further, the pressure-temperature sensor is a one-dimensional sensor.

Example

The following examples describe the content disclosed in the present application more specifically, and these examples are for illustrative purposes only, since various modifications and changes within the scope of the disclosed content of the application will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods, and can be directly The instruments used without further processing, as well as in the examples, are commercially available.

Example 1

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 2:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.4wt% of this part of the deep eutectic solvent ) phosphine oxide and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150 rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.1wt% of this part of the deep eutectic solvent , 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 2

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 1:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.5wt% of this part of the deep eutectic solvent ) phosphine oxide and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150 rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.2wt% of this part of the deep eutectic solvent , 0.6wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 3

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 5:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.6wt% of this part of the deep eutectic solvent ) phosphine oxide and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150 rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.05wt% of this part of the deep eutectic solvent , 0.6wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 4

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 2:0.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, and add the photoinitiator 2-hydroxyl-4'-(2-hydroxyethoxy)- 2-methylpropiophenone and 0.1wt% polymerization inhibitor 4-methoxyphenol are stirred at a rotating speed of 150rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning of the optical fiber core layer Precursor;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator 2-hydroxyl-4'-(2-hydroxyethoxyl)-2-methanol that is the quality of this part of the deep eutectic solvent 0.1wt% The crosslinking agent tripropylene glycol diacrylate of 0.5wt% and the polymerization inhibitor 4-methoxyphenol of 0.1wt% are stirred under the rotating speed of 150rpm until initiator, crosslinking agent and polymerization inhibitor Completely dissolve in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 5

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 2:2.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator 2-hydroxyl-2-methylpropiophenone and 0.1wt% of the photoinitiator 2-hydroxyl-2-methylpropiophenone and 0.1wt% of the quality 0.4wt% of this part of the deep eutectic solvent The polymerization agent 4-methoxyphenol is stirred at a rotating speed of 150rpm until the initiator and the polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator 2-hydroxyl-2-methyl propiophenone, the crosslinking agent o Diethylene glycol diacrylate phthalate and 0.1wt% polymerization inhibitor 4-methoxyphenol were stirred at a rotating speed of 150 rpm until the initiator, crosslinking agent and polymerization inhibitor were completely dissolved in the deep eutectic solvent , to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 6

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 2:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.4wt% of this part of the deep eutectic solvent ) phosphine oxide, 0.1% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150rpm until the initiator and polymerization inhibitor Completely dissolve in the deep eutectic solvent to obtain the spinning precursor of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.1wt% of this part of the deep eutectic solvent , 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) The spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding are respectively loaded into the syringe pump 1 and the syringe pump 2, and the syringe pump 1 and the syringe pump 2 are respectively charged at a rate of 2.5ml/L and 5mL/h. Push speed to extrude to the double-layer coaxial spinning head, and the needle of the spinning head is connected to a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 7

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 2:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.4wt% of this part of the deep eutectic solvent ) phosphine oxide, 0.2% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150rpm until the initiator and polymerization inhibitor Completely dissolve in the deep eutectic solvent to obtain the spinning precursor of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.1wt% of this part of the deep eutectic solvent , 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) The spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding are respectively loaded into the syringe pump 1 and the syringe pump 2, and the syringe pump 1 and the syringe pump 2 are respectively charged at a rate of 5ml/L and 2.5mL/h. Push speed to extrude to the double-layer coaxial spinning head, and the needle of the spinning head is connected to a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 8

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylic acid, glycerin, and betaine monohydrate in a closed container according to the molar ratio of 2:1.5:1, and stir in an oil bath at 75±5°C until the mixture forms a clear and transparent deep eutectic solvent, and cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.4wt% of this part of the deep eutectic solvent ) phosphine oxide and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150 rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.1wt% of this part of the deep eutectic solvent , 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Example 9

A photoelectric dual-mode flexible fiber, its preparation method specifically includes the following steps:

(1) Mix acrylamide, oxalic acid dihydrate, and betaine monohydrate in a closed container at a molar ratio of 2:1.5:1, and stir in an oil bath at 70±5°C until the mixture forms a clear and transparent eutectic Solvent, cooled to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.4wt% of this part of the deep eutectic solvent ) phosphine oxide and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150 rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.1wt% of this part of the deep eutectic solvent , 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Comparative example 1

A kind of optical fiber, its preparation method specifically comprises the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 4:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.4wt% of this part of the deep eutectic solvent ) phosphine oxide and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150 rpm until the initiator and polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of the optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that the consumption is the quality 0.1wt% of this part of the deep eutectic solvent , 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% inhibitor 4-methoxyphenol, stirring at a speed of 150rpm until the initiator, crosslinking agent and inhibitor The polymerization agent is completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

Comparative example 2

A kind of optical fiber, its preparation method specifically comprises the following steps:

(1) Mix acrylamide, glycerin, and choline chloride in a closed container at a molar ratio of 2:1.5:1, and stir in an oil bath at 65±5°C until the mixture forms a clear and transparent deep eutectic solvent, Cool to room temperature;

(2) Get part of the deep eutectic solvent as the prescription of the optical fiber core layer, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) that consumption is the quality 0.1wt% of this part of the deep eutectic solvent ) phosphine oxide, 0.5wt% crosslinking agent polyethylene glycol diacrylate (MW ≈ 200) and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150rpm until the initiator, crosslinking The agent and the polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor of the optical fiber core layer;

Get part of the deep eutectic solvent as the prescription of optical fiber cladding, add the photoinitiator diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide that consumption is the quality 0.4wt% of this part of deep eutectic solvent and 0.1wt% polymerization inhibitor 4-methoxyphenol, stirring at a rotating speed of 150rpm until the initiator and the polymerization inhibitor are completely dissolved in the deep eutectic solvent to obtain the spinning precursor solution of the optical fiber cladding;

(3) Fill the spinning precursor solution of the optical fiber core layer and the spinning precursor solution of the optical fiber cladding into syringe pump 1 and syringe pump 2 respectively, and both syringe pump 1 and syringe pump 2 are extruded to Double-layer coaxial spinning head, the needle of the spinning head is connected with a silicone tube with an inner diameter of 1mm and a length of 1.5cm;

(4) The spinning solution flowing down vertically is solidified and formed in the area of ultraviolet light (optical density ≈ 10mW cm ^–2 , wavelength 365nm) at a height of 20cm to obtain a photoelectric dual-mode flexible fiber. The ultraviolet light area is controlled by four UV curing lamps In the surrounding irradiation area, the distance between each UV curing lamp and the center point is 15cm, and the optical fiber is wound and collected by the collection device below the ultraviolet irradiation area.

In order to investigate the photoelectric dual-mode flexible fiber performance described in the application, the following experiments were carried out:

(1) Conductivity test: The photoelectric dual-mode flexible fiber described in Examples 1 to 9 and the optical fibers of Comparative Example 1 and Comparative Example 2 were used to measure their AC impedance and calculate their conductivity using an electrochemical workstation. The experimental results are shown in Table 1 , the electrical conductivity of the photoelectric dual-mode flexible fiber described in this application is 0.001-0.08S m ^-1 . 1 is the AC impedance spectrum of the core material of the optoelectronic dual-mode flexible fiber prepared in Example 1.

(2) Transparency test: the photoelectric dual-mode flexible fiber described in Examples 1 to 9 and the optical fibers of Comparative Example 1 and Comparative Example 2 were used to record the transmittance in the range of visible light from 400 to 800 nm with a UV spectrophotometer and calculate its transparency , The experimental results are shown in Table 2. The transparency of the photoelectric dual-mode flexible fiber described in this application is 90.1-93.2%. 2 is the ultraviolet spectrum of the core material of the optoelectronic dual-mode flexible fiber prepared in Example 1.

(3) Optical bending sensitivity test: the core layer of the photoelectric dual-mode flexible fiber described in Examples 1 to 9 and the core layer of the optical fiber of Comparative Example 1 and Comparative Example 2 are recorded with an optical power meter under different bending angles. And calculate its optical loss, and obtain the optical bending sensitivity after fitting the curve. The experimental results are shown in Table 1. The optical bending sensitivity of the photoelectric dual-mode flexible fiber described in this application is 0.043～0.088dB° ^-1 , the optical bending sensitivity is high, and it has Excellent optical signal sensing ability. 3 is the light loss curves of the photoelectric dual-mode flexible fiber prepared in Example 1 under different bending angles.

(4) Electrical temperature sensitivity test: the core layer of the photoelectric dual-mode flexible fiber described in Examples 1 to 9 and the core layer of the optical fiber of Comparative Example 1 and Comparative Example 2 are recorded using a digital source meter in the range of 30-70 ° C The electrical resistance change and the electrical temperature sensitivity are calculated. The experimental results are shown in Table 1. The electrical temperature sensitivity of the photoelectric dual-mode flexible fiber described in this application is 0.55-1.484% ℃ ^-1 , the electrical temperature sensitivity is high, and it has excellent electrical signal sensing ability. 4 is the resistance change curve of the optoelectronic dual-mode flexible fiber prepared in Example 1 in the range of 30-70°C.

Table 1

Remarks: Comparative Example 1 is a rigid material, and the optical bending sensitivity cannot be tested; Comparative Example 2 has a large optical loss, the received optical power signal is very weak, and the optical bending sensitivity is also difficult to test.

Applied experiment

Examples 10-18

As shown in Figure 6, the photoelectric dual-mode flexible fiber described in Examples 1 to 9 is applied to a pressure-temperature sensor, and the specific application method is as follows:

(1) The photoelectric dual-mode flexible fiber of embodiment 1 to 9 is placed on the surface of a 3cm thick sponge cushion by intercepting 5-15cm;

(2) Coupling the core layer at both ends of the photoelectric dual-mode flexible fiber with two polymethyl methacrylate pigtails, one of which is connected to the laser as the transmitting end, and the other pigtail is connected to the optical power meter as the receiving end end;

(3) Connect the core layer parts at both ends of the photoelectric dual-mode flexible fiber to two conductive wires at the same time, and the two conductive wires are respectively connected to the positive pole and the negative pole of the digital source meter;

(4) The laser emits laser light with a wavelength of 532nm, which is transmitted through the core layer of the photoelectric dual-mode flexible fiber to the optical power meter as an optical signal sensing system for monitoring pressure changes; digital source meter, conductive wire and photoelectric dual-mode flexible fiber The core layer is also used as an electrical signal sensing system to monitor temperature changes.

Comparative example 3

The optical fiber described in Comparative Example 1 was applied to a pressure-temperature sensor, and the specific application method was the same as in Examples 10 to 18.

Comparative example 4

The optical fiber described in Comparative Example 2 was applied to a pressure-temperature sensor, and the specific application method was the same as in Examples 10 to 18.

Resistance and optical loss change test: Examples 10 to 18 (the application experiments of embodiments 10 to 18 correspond to the photoelectric dual-mode flexible fibers of embodiments 1 to 9 respectively) and comparative example 3 and comparative example 4 use a digital source meter to test their resistance Change and optical power meter to test the change of the optical power and calculate the change of the loss. The experimental results are shown in Table 2. The experimental results found that when the photoelectric dual-mode flexible fiber described in Examples 1 to 9 is applied to a pressure-temperature sensor, it can receive pressure and temperature stimuli at the same time, indicating that optical signal sensing has pressure stimuli sensitivity, and electrical signal Sensing is sensitive to temperature stimuli. When pressure and temperature stimuli are received at the same time, the two modalities are used to feedback one of the stimuli respectively, and the mutual influence is small. Among them, FIG. 5 shows the resistance and optical loss changes of the optoelectronic dual-mode flexible fiber prepared in Example 1 under different strain conditions. Figure 7 shows the electrical and optical signal changes corresponding to pressure and temperature stimuli when the photoelectric dual-mode flexible fiber prepared in Example 1 is applied to a pressure-temperature sensor (the small picture shows the signal curve after the range of the vertical axis is narrowed) ).

Table 2

experimental project Change in optical loss/change in resistance when the same pressure is applied When changing the same temperature, resistance change/optical loss change Example 10 5.8 21.3 Example 11 8.2 28.1 Example 12 3.8 15.4 Example 13 4.7 18.2 Example 14 6.9 30.4 Example 15 5.2 20.1 Example 16 4.5 19.3 Example 17 6 23.9 Example 18 9.8 10.7 Comparative example 3 Rigid material, unable to test 9.6 Comparative example 4 Large optical loss, weak received optical power signal Large optical loss, weak received optical power signal

Claims (10)

1. The application of the photoelectric dual-mode flexible fiber in the pressure-temperature sensor is characterized in that the preparation method of the photoelectric dual-mode flexible fiber comprises the following steps:

(1) The polymerizable hydrogen bond donor, the non-polymerizable hydrogen bond donor and the hydrogen bond acceptor are mixed according to the molar ratio (1-3): (0.5-2.5): 1, mixing, forming a clear and transparent eutectic solvent by mixing at 60-90 ℃, and cooling to room temperature;

(2) Adding a photoinitiator 1 or a photoinitiator 1 and a cross-linking agent 1 into the eutectic solvent, and uniformly stirring to obtain a spinning precursor solution of the optical fiber core layer, wherein the dosage of the photoinitiator 1 is 0.4-0.6wt% of the eutectic solvent, and the dosage of the cross-linking agent 1 is 0-0.2wt% of the eutectic solvent;

adding a photoinitiator 2 and a cross-linking agent 2 into the eutectic solvent, and uniformly stirring to obtain a spinning precursor liquid of the optical fiber cladding, wherein the dosage of the photoinitiator 2 is 0.05-0.2 wt% of the eutectic solvent, and the dosage of the cross-linking agent 2 is 0.4-0.6 wt% of the eutectic solvent;

(3) Filling spinning precursor liquid of an optical fiber core layer and spinning precursor liquid of an optical fiber cladding layer into a syringe pump 1 and a syringe pump 2 respectively, extruding the syringe pump 1 and the syringe pump 2 to a double-layer coaxial spinning head according to a propulsion rate ratio of 1:2-2:1, and connecting a silicone tube at a spinning head needle head;

(4) And (3) irradiating, solidifying and forming the spinning solution flowing down vertically through an ultraviolet light region to obtain the photoelectric dual-mode flexible fiber, and winding and collecting the photoelectric dual-mode flexible fiber through a line concentration device.

2. The use according to claim 1, wherein the polymerizable hydrogen bond donor is one or more of acrylic acid, methacrylic acid, maleic acid, acrylamide; the hydrogen bond acceptor is one or more of choline chloride, anhydrous betaine, monohydrate betaine, ammonium chloride, methyl triphenyl phosphorus bromide, benzyl triphenyl phosphorus chloride, N-diethyl ethanol ammonium chloride and the like.

3. The use according to claim 1, wherein the non-polymerizable hydrogen bond donor is glycerol or oxalic acid dihydrate.

4. The use according to claim 1, wherein the photoinitiator 1, 2 is one or more of 2-hydroxy-4' - (2-hydroxyethoxy) -2-methylpropaneketone, diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide, 2-hydroxy-2-methylpropaneketone.

5. The use according to claim 1, wherein the crosslinking agent 1, 2 is one or more of tripropylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, 1, 6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol phthalate diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, etc.

6. The use according to claim 1, wherein the optoelectric bimodal flexible fibers have an optical bending sensitivity of 0.043 to 0.088dB ° ^-1 The sensitivity of the electrical temperature is 0.55-1.484% ^-1 。

7. The use according to claim 1, wherein the intrinsic conductivity of the core material of the optoelectronically bimodal flexible fibers is from 0.001 to 0.08Sm ^-1 。

8. The use according to claim 1, wherein the transparency of the opto-electronically bimodal flexible fibers is in the range of 90.1 to 93.2%.

9. The application according to claim 1, characterized in that it comprises the steps of:

(1) Intercepting 5-15cm photoelectric dual-mode flexible fibers and placing the photoelectric dual-mode flexible fibers on the surface of a flexible substrate or implanting the photoelectric dual-mode flexible fibers into the flexible substrate;

(2) Respectively coupling core layer parts at two ends of the photoelectric dual-mode flexible fiber with two optical fiber tail fibers, wherein one optical fiber tail fiber is connected with a laser as a transmitting end, and the other optical fiber tail fiber is connected with an optical power meter as a receiving end;

(3) The core layer parts at the two ends of the photoelectric dual-mode flexible fiber are respectively connected with two conductive wires which are respectively connected with the positive electrode and the negative electrode of the digital source meter;

(4) Transmitting laser emitted by a laser to an optical power meter through a core layer of the photoelectric dual-mode flexible fiber to serve as an optical signal sensing system for monitoring pressure change; the digital source meter, the conductive wire and the core layer of the photoelectric dual-mode flexible fiber are simultaneously used as an electric signal sensing system for monitoring temperature change.

10. The use according to claim 9, wherein the flexible substrate is a flexible substrate having a thickness of 2-10 cm.

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