WO2025065841A1 - Infrared microscopic nondestructive testing method for fabric fibers - Google Patents

Abstract

An infrared microscopic nondestructive testing method for fabric fibers, comprising: instrument initialization; Fourier infrared spectrum detection; infrared microscopic imaging detection; and fabric fiber analysis. The method can perform precise infrared spectrum analysis and infrared broadband imaging while satisfying volume requirements, and perform pattern recognition and component analysis of fabric fibers by means of information fusion, to meet market regulatory requirements.

Description

A nondestructive testing method for fabric fibers using infrared microscopy Technical Field

The invention relates to the technical field of textile detection, and in particular to an infrared microscopic textile fiber nondestructive detection method.

Background Art

There are many types of fabrics, including cotton, linen, wool/viscose fabrics, silk products, viscose, down fabrics, etc. Fabric fiber testing is an important assessment indicator of textile inspection quality and one of the main contents of clothing labeling. The detection of fabric fiber components includes qualitative analysis and quantitative analysis. The detection of fiber components still follows the traditional method of qualitative analysis first and quantitative analysis later.

Qualitative analysis is to determine the type of fiber contained in the sample, usually referring to the fiber composition; quantitative analysis is to determine the amount of fiber contained, usually referring to the fiber content.

At present, the qualitative detection methods of textile fibers include microscopic observation, combustion method, chemical dissolution method, drug coloring method, melting point test method and infrared absorption spectroscopy. However, these methods have certain limitations. Microscopic observation and combustion methods can only identify natural fibers or synthetic fibers; although the chemical dissolution method can identify blended products, the organic solvents used in it have an impact on the health of the test personnel and also pollute the environment; infrared absorption spectroscopy has very high requirements for the test environment temperature, complex sample preparation, and long detection cycle, which cannot meet the requirements of rapid detection. The quantitative process, including the concentration of reagents, test temperature, reaction time, equipment performance, operator experience, etc., has high requirements. Therefore, the process of fiber component detection is relatively cumbersome, and the uncertainty of the test results is relatively large.

Near infrared spectroscopy (NIRS) is mainly used for non-destructive measurement of electromagnetic waves in the range of 800nm~2500nm. Unlike mass spectrometry and chromatography, this technology does not require purification and has been widely used in food, agriculture, medicine, oil refining and chemical industries. Qualitative analysis of near infrared spectroscopy is a method of using samples of known categories to establish a near infrared spectroscopy identification model and then examine whether unknown samples belong to this category of substances. It is mainly used for cluster analysis and discriminant analysis of substances.

The existing technology lacks the ability to simultaneously acquire high-resolution infrared spectra and wide-spectrum infrared images to detect textures such as the coarse weave and interweaving patterns of fabric fibers, as well as joint detection technology for component analysis and pattern recognition. It is impossible to perform fine infrared spectral analysis of specific small areas, and it is impossible to perform joint detection of the interweaving patterns of detection objects within the field of view.

Summary of the invention

The purpose of the present invention is to provide an infrared microscopic nondestructive testing method for fabric fibers in view of the problems in the prior art.

To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

An infrared microscopic nondestructive testing method for fabric fibers, characterized in that: a fabric fiber detector including a Fourier infrared spectrum detection optical path and an infrared microscopic imaging optical path is used for testing, wherein the Fourier infrared spectrum detection optical path includes an infrared light source, a beam splitter, a moving mirror, a static mirror, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, the orthogonal optical axis is perpendicular to the infrared optical axis, the beam splitter is placed at an angle of 45 degrees to the orthogonal optical axis, and the moving mirror mechanism controls the moving mirror to translate along the orthogonal optical axis.

The infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path multiplex an infrared light source, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, and are also provided with a cutting-in mirror and a total reflecting mirror. The cutting-in mechanism controls the cutting-in mirror to cut in or out of the infrared optical axis. When the cutting-in mirror cuts in the infrared optical axis, the infrared microscopic imaging optical path works, and when the cutting-in mirror cuts out of the infrared optical axis, the Fourier infrared spectrum detection optical path works. The infrared microscopic fabric detector is provided with a positioning cover, and the size of the positioning cover makes the fabric fiber sample be on the focal plane of the cassette microscope objective lens.

When the infrared microscopic fabric detector performs non-destructive testing on fabric fibers, the following steps are included:

Step 1, turn on the infrared light source, send instructions to the moving mirror mechanism, set the scanning step length and the starting and ending positions of the moving mirror along the orthogonal optical axis, and move the moving mirror to the starting position;

Step 2: Control the cutting mirror to cut out the infrared light axis, and start the infrared array in the integration mode to perform Fourier infrared spectrum detection.

Step 3, controlling the cutting mirror to cut into the infrared optical axis, and starting the infrared outer array working mode to the imaging mode, and performing infrared microscopic imaging detection;

Step 4, performing spectral analysis on the reflectivity or infrared absorption of the fabric fiber sample to be tested obtained in step 2 to obtain the molecular composition and content in the fabric fiber; performing image processing and analysis on the infrared wide-spectrum image of the same fabric fiber sample to be tested obtained in step 3 to obtain the thickness and interweaving information of the fabric fiber, and assist in component determination and pattern recognition.

While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

As a preferred technical solution of the present invention: the infrared microscopic fabric detector controls the turning on of the infrared light source through the equipped controller, sends instructions to the moving mirror mechanism, controls the cutting mirror to cut in or out of the infrared light axis, controls the working mode of the infrared outer array to the integration mode or the imaging mode, and receives its data.

As a preferred technical solution of the present invention: Step 2 comprises the following steps:

Step 2.1, detecting the intensity value of the standard white plate reflection of each wavelength within the wavelength range, the controller controls the moving mirror mechanism, controls the moving mirror to translate with the set scanning step length, and performs Fourier infrared spectrum detection at the same time. Any position of the scan corresponds to a certain infrared wavelength, the scanning step length corresponds to the spectral resolution, and the start and end positions of the scan correspond to the start and end wavelengths of the infrared detection. When the moving mirror translates to the end position, the detection ends, and the controller records the intensity value of the standard white plate reflection of each wavelength within the detection wavelength range;

Step 2.2, detect the intensity value of the reflection of the fabric fiber sample to be tested at each wavelength within the wavelength range, replace the standard white board with the fabric fiber sample to be tested, move the moving mirror in the opposite direction from the end position to the start position with the same step length, and perform Fourier infrared spectrum detection at the same time. When the moving mirror moves to the start position, the detection ends, and the controller records the intensity value of the reflection of the fabric fiber sample to be tested at each wavelength within the detection wavelength range.

Step 2.3, dividing the reflection intensity value of the tested fabric fiber sample measured in step 2.2 by the reflection intensity value of the standard white board measured in step 2.1, to obtain the reflectivity distribution of the tested fabric fiber sample within the detection wavelength range.

As a preferred technical solution of the present invention: a controller is provided, and the controller controls the turning on of the infrared light source, and controls the infrared array, specifies its working mode and receives its data.

As a preferred technical solution of the present invention: in the Fourier infrared spectrum detection optical path, the infrared light emitted by the infrared light source along the infrared optical axis is divided into two paths by the beam splitter: one path is reflected by the beam splitter and then emitted to the moving mirror along the orthogonal optical axis, reflected by the moving mirror and then passed through the beam splitter; the other path passes through the beam splitter, emitted to the static mirror along the infrared optical axis, reflected by the static mirror and then reflected by the beam splitter;

The moving mirror and the static mirror have different center distances to the beam splitter, resulting in an optical path difference. The two infrared lights are coherent lights, and after merging, they form an equi-inclined interference ring distribution. When the moving mirror is moving and scanning along the orthogonal optical axis, the center of the interference ring corresponds to the central main maximum infrared light intensity distribution of different wavelengths. After passing through the central hole of the perforated reflector B, only the central main maximum infrared light passes through, and then after being reflected by the perforated reflector A, it turns to the main optical axis perpendicular to the orthogonal optical axis, and then is focused to the fabric fiber sample on the focal plane through the cassette microscope objective. A part of the main maximum infrared light corresponding to a specific wavelength reflected by the fabric fiber sample is folded back along the main optical axis, passes through the cassette microscope objective, passes through the central hole of the perforated reflector A, and then is focused to the infrared surface array through the cassette microscope image lens;

The infrared array starts the integration mode under the control of the main controller, accumulates the intensity values of all pixels, and records the accumulated intensity values.

As a preferred technical solution of the present invention: in the infrared microscopic imaging optical path, the wide-spectrum infrared light emitted by the infrared light source along the infrared optical axis is reflected by the cutting-in mirror and turned to the cutting-in optical axis perpendicular to the infrared optical axis, and then reflected by the total reflection mirror and turned to the turning optical axis parallel to the infrared optical axis, and then reflected by the perforated reflector B and the perforated reflector A, and then turned to the main optical axis perpendicular to the orthogonal optical axis, and then focused to the fabric fiber sample on the focal plane by the cassette microscope objective lens, the wide-spectrum infrared light reflected by the fabric fiber sample is turned back along the main optical axis, passed through the cassette microscope objective lens, passed through the central hole of the perforated reflector A, and then focused and imaged onto the infrared surface array by the cassette microscope image lens, and the infrared surface array starts the imaging mode under the control of the main controller, and records the wide-spectrum infrared picture for subsequent analysis.

As a preferred technical solution of the present invention: the cassette microscope contains an imaging secondary mirror and an imaging primary mirror, the cassette microscope objective lens contains an object side primary mirror and an object side secondary mirror, the cassette microscope image lens and the cassette microscope objective lens are both designed for infinite imaging, and are coaxially symmetrically placed conjugately on the main optical axis. The cassette microscope objective lens first reflects the light emitted by the textile fiber sample on its focal plane through the object side primary mirror and the object side secondary mirror in succession, and turns it into parallel light with a certain magnification, and then reflects it through the imaging secondary mirror and the imaging primary mirror of the cassette microscope, and reduces the parallel light according to the magnification of the cassette microscope and focuses it to form an infrared surface array on the focal plane.

As a preferred technical solution of the present invention: the surfaces of the imaging secondary mirror, the imaging primary mirror, the object side primary mirror, the object side secondary mirror, the moving mirror, the static mirror, the cutting-in mirror, the perforated reflector B, and the perforated reflector A are all coated with an infrared high-reflection film, which efficiently reflects infrared light within the emission range of the infrared light source.

As a preferred technical solution of the present invention: different magnification ratios of the cassette microscope image lens and the cassette microscope objective lens are used to obtain different image-object magnification ratios on the infrared surface array.

As a preferred technical solution of the present invention: the beam splitter is formed by bonding two identical thin infrared high-transmittance optical glasses, the bonding surface is coated with an infrared semi-reflective and semi-transparent film, and is placed at an angle of 45 degrees to the orthogonal optical axis.

As a preferred technical solution of the present invention: the fabric fiber detector uses a lithium battery as a driving power source.

As a preferred technical solution of the present invention: the fabric fiber detector is equipped with an operating handle for the operator to carry it.

The present invention has the following beneficial effects: an infrared microscopic fabric fiber nondestructive testing method of the present invention utilizes a Fourier infrared spectrum detection optical path, an infrared microscopic imaging optical path multiplexing infrared light source, a holed reflector B, a holed reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, and controls the cutting-in mirror to cut in or out of the infrared optical axis through a cutting-in mechanism, thereby realizing the switching of the infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path, obtaining a high-resolution infrared spectrum and a wide-spectrum infrared image of a completely overlapping detection target, realizing the texture detection of the coarse weaving, interweaving mode and the like at the same position of the fabric fiber, and the comprehensive detection of fiber component analysis and pattern recognition.

The infrared microscopic fabric fiber nondestructive testing method of the present invention utilizes the multiplexing structure of the Fourier infrared spectrum detection optical path and the infrared microscopic imaging optical path, and provides a method for preparing a more compact and miniaturized fabric fiber detector. By providing a positioning cover and the size of the positioning cover, the part to be tested can be quickly placed on the focal plane of the cassette microscope objective lens, so that the fabric can be detected more quickly. Therefore, the present invention provides a compact and miniaturized fabric detector capable of rapid detection.

The infrared microscopic nondestructive testing method for fabric fibers of the present invention adopts two working modes, performs precise infrared spectrum analysis and infrared wide-spectrum imaging simultaneously, and performs pattern recognition and component analysis of fabric fibers through information fusion, which has great application prospects in the field of on-site testing of fabric fibers.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of the infrared microscopic nondestructive testing method for textile fibers of the present invention;

FIG2 is a structural diagram of a fabric fiber detector used in the infrared microscopic fabric fiber nondestructive testing method of the present invention;

In the accompanying drawings, there are a detector body 1; a lithium battery 2; a charging port 3; a switch 4; a power supply line 5; a moving mirror 6; an orthogonal optical axis 7; a beam splitter 8; a moving mirror mechanism 9; a cutting mirror 10; a cutting mechanism 11; a main controller 12; an infrared light source 13; an operating handle 14; an infrared optical axis 15; a cutting optical axis 16; a static mirror 17; a total reflecting mirror 18; an infrared surface array 19; a cassette microscope 20; an imaging secondary mirror 21; an imaging primary mirror 22; a turning optical axis 23; a perforated reflector A 24; a perforated reflector B 25; an object side primary mirror 26; a primary optical axis 27; an object side secondary mirror 28; a fabric fiber sample 29; a positioning cover 30; and a cassette microscope objective lens 31.

DETAILED DESCRIPTION

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1, an infrared microscopic nondestructive testing method for fabric fibers of the present invention adopts a fabric fiber detector including a Fourier infrared spectrum detection optical path and an infrared microscopic imaging optical path for testing. The fabric fiber detector includes a detector body 1, including a lithium battery 2, a moving mirror 6, a beam splitter 8, a moving mirror mechanism 9, a cutting mirror 10, a cutting mechanism 11, a main controller 12, an infrared light source 13, a static mirror 17, a total reflector 18, an infrared surface array 19, a cassette microscope 20, a perforated reflector A 24, a perforated reflector B 25 and a cassette microscope objective 31.

The cassette microscope 20 contains an imaging secondary mirror 21 and an imaging primary mirror 22. The cassette microscope objective lens 31 contains an object side primary mirror 26 and an object side secondary mirror 28. Both the cassette microscope 20 and the cassette microscope objective lens 31 are designed for infinite imaging and are placed coaxially symmetrically conjugately on the main optical axis 27. The cassette microscope objective lens 31 first reflects the light emitted by the fabric fiber sample 29 on its focal plane from the object side primary mirror 26 and the object side secondary mirror 28 in succession, and then turns it into parallel light with a certain magnification (the magnification of the cassette microscope objective lens 31, the magnification of this embodiment is 20), and then reflects the imaging secondary mirror 21 and the imaging primary mirror 22 of the cassette microscope 20, and the parallel light is reduced and focused to the infrared array 19 on the focal plane according to the magnification of the cassette microscope 20, the magnification of this embodiment is 5. Different magnification ratios of the cassette microscope image lens 20 and the cassette microscope objective lens 31 can be selected to obtain different image-object magnification ratios on the infrared surface array 19. The magnification ratio in this embodiment is 4.

The moving mirror mechanism 9 can control the moving mirror 6 to translate along the orthogonal optical axis 7. The cutting mechanism 11 can control the cutting mirror 10 to cut into or out of the infrared optical axis 15.

The infrared light source 13 can emit a wide spectrum infrared light within a certain range, which is 1000 cm-1-3300 cm-1 in this embodiment, and the corresponding infrared surface array 19 can sense the infrared light within this range and form an image. The imaging secondary mirror 21, the imaging primary mirror 22, the object primary mirror 26, the object secondary mirror 28, the moving mirror 6, the static mirror 17, the surface of the cutting mirror 10, the holed reflector B 25, and the holed reflector A 24 are all coated with infrared high-reflection films, which can efficiently reflect the infrared light within the emission range of the infrared light source 13.

The Fourier infrared spectrum detection optical path is composed of an infrared light source 13, a beam splitter 8, a moving mirror 6, a static mirror 17, a perforated reflector B 25, a perforated reflector A 24, a cassette microscope objective 31, a cassette microscope image lens 20, and an infrared surface array 19. The orthogonal optical axis 7 is perpendicular to the infrared optical axis 15. The beam splitter 8 is formed by laminating two identical thin infrared high-transmittance optical glasses, and the laminating surface is coated with an infrared semi-reflective and semi-transmissive film, and is placed at an angle of 45 degrees to the orthogonal optical axis 7. In the Fourier infrared spectrum detection mode, the infrared light emitted by the infrared light source 13 along the infrared optical axis 15 is divided into two paths by the beam splitter 8: one path is reflected by the beam splitter 8 and then emitted to the moving mirror 6 along the orthogonal optical axis 7, reflected and returned by the moving mirror 6, and then passes through the beam splitter 8; the other path passes through the beam splitter 8, and is emitted to the static mirror 17 along the infrared optical axis 15, reflected and returned by the static mirror 17, and then reflected by the beam splitter 8. The moving mirror 6 and the static mirror 17 have different center distances to the beam splitter 8, resulting in an optical path difference. Therefore, the two infrared lights are coherent lights, which form an equi-inclined interference ring distribution after merging. When the moving mirror 6 is translated or scanned along the orthogonal optical axis 7, the center of the interference ring corresponds to the central main maximum infrared light intensity distribution of different wavelengths. At a certain detection moment, it is a certain wavelength value. After passing through the central hole of the perforated reflector B 25, only the central main maximum infrared light passes through, and then after being reflected by the perforated reflector A 24, it turns to the main optical axis 27 perpendicular to the orthogonal optical axis 7, and then is focused to the fabric fiber sample 29 on the focal plane through the cassette microscope objective 31. A part of the main maximum infrared light corresponding to a certain wavelength reflected by the fabric fiber sample 29 is turned back along the main optical axis 27, passes through the cassette microscope objective 31, passes through the central hole of the perforated reflector A 24, and then is focused to the infrared surface array 19 through the cassette microscope image lens 20. The infrared array 19 starts the integration mode under the control of the main controller 12, that is, the intensity values of all pixels are accumulated, which is equivalent to a unit detector, and the accumulated intensity value is recorded.

The infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path multiplex the infrared light source 13, the perforated reflector B 25, the perforated reflector A 24, the cassette microscope objective 31, the cassette microscope image lens 20, and the infrared surface array 19. In addition, it contains a cutting mirror 10 and a total reflection mirror 18. When the cutting mirror 10 cuts into the infrared optical axis 15 under the control of the cutting mechanism 11, the infrared microscopic imaging optical path works; conversely, when the cutting mirror 10 cuts out of the infrared optical axis 15 under the control of the cutting mechanism 11, the Fourier infrared spectrum detection optical path works. In the infrared microscopic imaging mode, the wide-spectrum infrared light emitted by the infrared light source 13 along the infrared optical axis 15 is reflected by the cutting mirror 10, turned to the cutting optical axis 16 perpendicular to the infrared optical axis 15, and then reflected by the total reflection mirror 18 to the turning optical axis 23 parallel to the infrared optical axis 15, and then reflected by the hole reflector B 25 and the hole reflector A 24, and then turned to the main optical axis 27 perpendicular to the orthogonal optical axis 7, and then focused to the fabric fiber sample 29 on the focal plane by the cassette microscope objective lens 31, and the wide-spectrum infrared light reflected by the fabric fiber sample 29 is turned back along the main optical axis 27, passed through the cassette microscope objective lens 31, passed through the central hole of the hole reflector A 24, and then focused and imaged onto the infrared surface array 19 by the cassette microscope image lens 20. The infrared surface array 19 starts the imaging mode under the control of the main controller 12, and records the wide-spectrum infrared picture for subsequent analysis.

The lithium battery 2 has a charging interface 3 and a switch 4. The battery charger can charge the lithium battery 2 through the charging interface 3. When the switch 4 is turned on, the lithium battery 2 supplies power to the moving mirror mechanism 9, the cutting mechanism 11, the main controller 12, the infrared light source 13, and the infrared surface array 19 through the power supply line 5.

During on-site inspection, the operator lifts the operating handle 14 to make the positioning cover 30 close to the fabric fiber sample 29. The size of the positioning cover 30 allows the fabric fiber sample 29 to be on the focal plane of the cassette microscope objective lens 31, which is convenient for on-site quick inspection.

The controller 12 is used to turn on the infrared light source 13, control the infrared array 19, specify its working mode and receive its data. The controller 12 is also used to send instructions to the moving mirror mechanism 9 and the cutting mechanism 11, so as to control the scanning step length and the starting and ending positions of the moving mirror 6 along the orthogonal optical axis 7, and control the cutting mirror 10 to cut in and out of the infrared optical axis 15.

The present invention provides an infrared microscopic nondestructive testing method for textile fibers, which specifically comprises the following steps:

(1) Instrument initialization

Before on-site testing, the lithium battery 2 is charged through the charging interface 3. During on-site testing, the operator turns on the switch 4, and the lithium battery 2 powers the instrument. The controller 12 turns on the infrared light source 13, sends instructions to the moving mirror mechanism 9, sets the scanning step length and the starting and ending positions of the moving mirror 6 along the orthogonal optical axis 7, and moves the moving mirror 6 to the starting position.

(2) Fourier transform infrared spectroscopy detection

The controller 12 sends instructions to the cutting mechanism 11 to control the cutting mirror 10 to cut out the infrared light axis 15, and starts the working mode of the infrared array 19 to the integration mode. The operator lifts the operating handle 14 to make the positioning cover 30 close to a standard white board. The controller 12 sends instructions to the moving mirror mechanism 9 to control the moving mirror 6 to translate with the set scanning step length. At the same time, Fourier infrared spectrum detection is carried out. At any position of the scan, it corresponds to a certain wavelength of infrared. The scanning step length corresponds to the spectral resolution, and the starting and ending positions of the scan correspond to the starting and ending wavelengths of the infrared detection. The detection ends when the moving mirror 6 translates to the end position. The controller 12 records the detection wavelength range, which is 1000 cm-1-3300cm-1 in this embodiment. The intensity value of the standard white board reflection at each wavelength within the detection wavelength range, that is, the spectral distribution of the infrared light source 13.

The standard white board is replaced with the fabric fiber sample 29 to be tested, and the moving mirror 6 moves in the opposite direction from the end position to the start position with the same step length, and Fourier infrared spectrum detection is performed at the same time, and the detection is terminated when the moving mirror 6 moves to the start position. The controller 12 records the intensity value of the reflection of the fabric fiber sample 29 to be tested at each wavelength within the detection wavelength range, and divides it with the intensity value of the reflection of the standard white board to obtain the reflectivity distribution of the fabric fiber sample 29 to be tested within the detection wavelength range.

(3) Infrared microscopic imaging detection

The controller 12 sends a command to the cutting mechanism 11, controls the cutting mirror 10 to cut into the infrared optical axis 15, and starts the working mode of the infrared outer array 19 to the imaging mode. The controller 12 records the wide-spectrum infrared image reflected by the fabric fiber sample 29 to be tested within the detection wavelength range. The image can remove the color interference of the fabric fiber, the image texture contains the thickness and interweaving information of the fabric fiber, and the image gray contains the composition information.

(4) Fabric fiber analysis

By performing spectral analysis on the reflectivity or infrared absorption of the fabric fiber sample 29 obtained in step 2, the molecular composition and content in the fabric fiber can be obtained. By performing image processing and analysis on the infrared wide-spectrum image of the same fabric fiber sample 29 obtained in step 3, the thickness and interweaving information of the fabric fiber can be obtained, and the composition determination and pattern recognition can be assisted.

The present invention discloses an infrared microscopic nondestructive testing method for fabric fibers. The method adopts a fabric fiber detector including a Fourier transform infrared spectrum detection optical path and an infrared microscopic imaging optical path for testing. The method adopts two working modes, namely, a Fourier transform spectrum detection mode and a wide-spectrum infrared reflection microscopic imaging mode, and reuses the infrared light source, infrared surface array, and cassette microscopic imaging system. Under the condition of meeting certain volume requirements, accurate infrared spectrum analysis and infrared wide-spectrum imaging can be performed simultaneously. Pattern recognition and component analysis of fabric fibers can be performed through information fusion to meet market supervision needs.

The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims (10)

An infrared microscopic nondestructive testing method for fabric fibers, characterized in that: a fabric fiber detector including a Fourier infrared spectrum detection optical path and an infrared microscopic imaging optical path is used for testing, wherein the Fourier infrared spectrum detection optical path includes an infrared light source, a beam splitter, a moving mirror, a static mirror, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, the orthogonal optical axis is perpendicular to the infrared optical axis, the beam splitter is placed at an angle of 45 degrees to the orthogonal optical axis, and the moving mirror mechanism controls the moving mirror to translate along the orthogonal optical axis. The infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path multiplex an infrared light source, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, and are also provided with a cutting-in mirror and a total reflecting mirror. The cutting-in mechanism controls the cutting-in mirror to cut in or out of the infrared optical axis. When the cutting-in mirror cuts in the infrared optical axis, the infrared microscopic imaging optical path works, and when the cutting-in mirror cuts out of the infrared optical axis, the Fourier infrared spectrum detection optical path works. The infrared microscopic fabric detector is provided with a positioning cover, and the size of the positioning cover makes the fabric fiber sample be on the focal plane of the cassette microscope objective lens. When the infrared microscopic fabric detector performs non-destructive testing on fabric fibers, the following steps are included: Step 1: Initialize the instrument, turn on the infrared light source, send instructions to the moving mirror mechanism, set the scanning step length and start and end positions of the moving mirror along the orthogonal optical axis, and move the moving mirror to the starting position; Step 2: Control the cutting mirror to cut out the infrared light axis, and start the infrared array in the integration mode to perform Fourier infrared spectrum detection. Step 3, controlling the cutting mirror to cut into the infrared optical axis, and starting the infrared outer array working mode to the imaging mode, and performing infrared microscopic imaging detection; Step 4, fabric fiber analysis, performing spectral analysis on the reflectivity or infrared absorption of the fabric fiber sample to be tested obtained in step 2 to obtain the molecular composition and content in the fabric fiber; performing image processing and analysis on the infrared wide-spectrum image of the same fabric fiber sample to be tested obtained in step 3 to obtain the thickness and interweaving information of the fabric fiber, and assist in component determination and pattern recognition. The infrared microscopic textile fiber nondestructive testing method as described in claim 1 is characterized in that the infrared microscopic textile detector controls the turning on of the infrared light source through a controller provided therein, sends instructions to the moving mirror mechanism, controls the cutting mirror to cut in or out of the infrared light axis, controls the working mode of the infrared outer array to be the integration mode or the imaging mode, and receives its data. The infrared microscopic nondestructive testing method for textile fibers as claimed in claim 2 is characterized in that: step 2 comprises the following steps: Step 2.1, detecting the intensity value of the standard white plate reflection of each wavelength within the wavelength range, the controller controls the moving mirror mechanism, controls the moving mirror to translate with the set scanning step length, and performs Fourier infrared spectrum detection at the same time. Any position of the scan corresponds to a certain infrared wavelength, the scanning step length corresponds to the spectral resolution, and the start and end positions of the scan correspond to the start and end wavelengths of the infrared detection. When the moving mirror translates to the end position, the detection ends, and the controller records the intensity value of the standard white plate reflection of each wavelength within the detection wavelength range; Step 2.2, detect the intensity value of the reflection of the fabric fiber sample to be tested at each wavelength within the wavelength range, replace the standard white board with the fabric fiber sample to be tested, move the moving mirror in the opposite direction from the end position to the start position with the same step length, and perform Fourier infrared spectrum detection at the same time. When the moving mirror moves to the start position, the detection ends, and the controller records the intensity value of the reflection of the fabric fiber sample to be tested at each wavelength within the detection wavelength range. Step 2.3, dividing the reflection intensity value of the tested fabric fiber sample measured in step 2.2 by the reflection intensity value of the standard white board measured in step 2.1, to obtain the reflectivity distribution of the tested fabric fiber sample within the detection wavelength range. The infrared microscopic nondestructive testing method for fabric fibers as described in claim 2 is characterized in that: in step 3, the controller sends instructions to the cutting mechanism to control the cutting mirror to cut into the infrared optical axis, and starts the infrared surface array to work in the imaging mode, and the controller records the wide-spectrum infrared image reflected by the fabric fiber sample to be tested within the detection wavelength range. The image removes the color interference of the fabric fiber, the image texture contains the thickness and interweaving information of the fabric fiber, and the image grayscale contains the composition information. The infrared microscopic nondestructive testing method for textile fibers as claimed in claim 1 is characterized by: In the Fourier infrared spectrum detection optical path, the infrared light emitted by the infrared light source along the infrared optical axis is divided into two paths by the beam splitter: one path is reflected by the beam splitter and then emitted to the moving mirror along the orthogonal optical axis, reflected by the moving mirror and then passed through the beam splitter; the other path passes through the beam splitter, emitted to the static mirror along the infrared optical axis, reflected by the static mirror and then reflected by the beam splitter; The moving mirror and the static mirror have different center distances to the beam splitter, resulting in an optical path difference. The two infrared lights are coherent lights, and after merging, they form an equi-inclined interference ring distribution. When the moving mirror is moving and scanning along the orthogonal optical axis, the center of the interference ring corresponds to the central main maximum infrared light intensity distribution of different wavelengths. After passing through the central hole of the perforated reflector B, only the central main maximum infrared light passes through, and then after being reflected by the perforated reflector A, it turns to the main optical axis perpendicular to the orthogonal optical axis, and then is focused to the fabric fiber sample on the focal plane through the cassette microscope objective. A part of the main maximum infrared light corresponding to a specific wavelength reflected by the fabric fiber sample is folded back along the main optical axis, passes through the cassette microscope objective, passes through the central hole of the perforated reflector A, and then is focused to the infrared surface array through the cassette microscope image lens; The infrared array starts the integration mode under the control of the main controller, accumulates the intensity values of all pixels, and records the accumulated intensity values. The infrared microscopic nondestructive testing method for textile fibers as described in claim 1 is characterized in that: in the infrared microscopic imaging optical path, the wide-spectrum infrared light emitted by the infrared light source along the infrared optical axis is reflected by the cutting-in mirror, turned to the cutting-in optical axis perpendicular to the infrared optical axis, and then reflected by the total reflection mirror to turn to the turning optical axis parallel to the infrared optical axis, and after being reflected by the perforated reflector B and the perforated reflector A, it is turned to the main optical axis perpendicular to the orthogonal optical axis, and then is focused to the textile fiber sample on the focal plane by the cassette microscope objective lens, the wide-spectrum infrared light reflected by the textile fiber sample is turned back along the main optical axis, passed through the cassette microscope objective lens, passed through the central hole of the perforated reflector A, and then focused and imaged onto the infrared surface array by the cassette microscope image lens, and the infrared surface array starts the imaging mode under the control of the main controller, and records the wide-spectrum infrared image for subsequent analysis. The infrared microscopic textile fiber nondestructive testing method as described in claim 1 is characterized in that: the card-type microscope image lens contains an imaging secondary mirror and an imaging primary mirror, the card-type microscope objective lens contains an object side primary mirror and an object side secondary mirror, the card-type microscope image lens and the card-type microscope objective lens are both designed for infinite imaging, and are placed coaxially symmetrically conjugately on the main optical axis, the card-type microscope objective lens first reflects the light emitted by the textile fiber sample on its focal plane through the object side primary mirror and the object side secondary mirror in turn, and turns it into parallel light with a certain magnification, and then reflects it through the imaging secondary mirror and the imaging primary mirror of the card-type microscope image lens, and reduces the parallel light according to the magnification of the card-type microscope image lens and focuses it to form an infrared surface array on the focal plane; Or, the surfaces of the imaging secondary mirror, the imaging primary mirror, the object primary mirror, the object secondary mirror, the moving mirror, the static mirror, the cutting mirror, the perforated reflector B, and the perforated reflector A are all coated with an infrared high-reflection film, which efficiently reflects infrared light within the emission range of the infrared light source. The infrared microscopic nondestructive testing method for textile fibers as described in claim 1 is characterized by different magnification ratios of the cassette microscope image lens and the cassette microscope objective lens to obtain different image-object magnification ratios on the infrared surface array. The infrared microscopic nondestructive testing method for textile fibers as described in claim 1 is characterized in that the beam splitter is formed by bonding two identical thin pieces of infrared high-transmittance optical glass, the bonding surface is coated with an infrared semi-reflective and semi-transparent film, and is placed at an angle of 45 degrees to the orthogonal optical axis. The infrared microscopic nondestructive testing method for textile fibers as claimed in claim 1 is characterized in that: the textile fiber detector uses a lithium battery as a driving power source; The fabric fiber tester is equipped with an operating handle for the operator to carry it.