CN115326637B - In-situ density measurement device and method based on diffuse reflection laser heterodyne coherence - Google Patents
In-situ density measurement device and method based on diffuse reflection laser heterodyne coherenceInfo
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- CN115326637B CN115326637B CN202211075809.1A CN202211075809A CN115326637B CN 115326637 B CN115326637 B CN 115326637B CN 202211075809 A CN202211075809 A CN 202211075809A CN 115326637 B CN115326637 B CN 115326637B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
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Abstract
The invention provides an in-situ density measurement device and method based on heterodyne coherence of diffuse reflection laser, wherein the device comprises a laser device for generating detection laser, a heterodyne coherence module arranged behind the laser device for dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through a transmission type diffuse reflection medium density measurement module for detecting a medium to be measured, enabling return light of the measurement light to interfere with the reference light to generate an interference light signal, demodulating the interference light signal and outputting the density of the medium to be measured, and a transmission type diffuse reflection medium density measurement module arranged behind the heterodyne coherence module for coupling the measurement light with the medium to be measured and enabling the return light of the measurement light to return to the heterodyne coherence module through a diffuse reflection object. The device and the method solve the problems of the existing interferometry medium density by combining heterodyne and diffuse reflection objects as a method for detecting light reflection, and realize medium density in-situ measurement under the conditions of large dynamic range and high precision.
Description
Technical Field
The disclosure relates to the technical field of optical density measurement, in particular to an in-situ density measurement device and method based on diffuse reflection laser heterodyne coherence.
Background
Density is an important characteristic and index of a substance, such as atmospheric density and ocean density, is an important content of ecological environment observation, and can realize the observation in the fields of ocean salt circulation, climate change, biochemistry, ocean engineering, ecology and the like.
The optical density measurement in the prior art mainly comprises density detection based on laser deflection, but has low sensitivity, is limited by a V-shaped groove angle and a detector, has low dynamic range, cannot realize gas-liquid two-phase compatible measurement, has the sensitivity characteristic of changing the refractive index of a medium by a surface plasma method through a metal surface, is easy to corrode and cannot work under water for a long time, realizes density detection on the medium to be measured by a high-sensitivity Mach-Zehnder interferometer through a coherence principle, and is the highest method at present, but has higher angle difference of light transmission aiming at different mediums by adopting a specular reflection or transmission mode, has strict requirements on coherence angle of two beams of light, cannot realize medium density measurement due to incapacity of coherence when the refractive index difference of the medium is larger, and has the problems of easy disturbance and small dynamic range.
Disclosure of Invention
In view of the above problems, the present invention provides an in-situ density measurement device and method based on heterodyne coherence of diffuse reflection laser, so as to solve the above technical problems.
One aspect of the present disclosure provides an in-situ density measurement device based on heterodyne coherence of a diffusely reflected laser, comprising:
A laser for generating a detection laser;
The heterodyne coherence module is arranged behind the laser and is used for dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through the transmission diffuse reflection medium density measurement module to detect a medium to be detected, enabling return light of the measurement light to interfere with the reference light to generate an interference light signal, demodulating the interference light signal and outputting the density of the medium to be detected;
The transmission type diffuse reflection medium density measuring module is arranged behind the heterodyne correlation module and is used for coupling the measuring light with the medium to be measured and enabling the return light source of the measuring light to return to the heterodyne correlation module through a diffuse reflection object.
Optionally, the heterodyne coherence module includes:
the first polarization beam splitting prism is used for splitting the detection laser into measuring light and reference light;
a beam splitter prism for making the return light of the measurement light coherent with the reference light;
and the demodulation system is used for demodulating the interference optical signal to obtain and output the density of the medium to be measured.
Optionally, the heterodyne coherence module further comprises:
And the heterodyne modulator is arranged between the first polarization beam splitting prism and the beam splitting prism and is used for heterodyning the reference light.
Optionally, the heterodyne correlation module further includes:
the second polarization beam splitting prism is arranged between the first polarization beam splitting prism and the beam splitting prism and is used for reflecting the return light of the measuring light to the beam splitting prism;
and the reflecting mirror is arranged between the heterodyne modulator and the beam splitting prism and is used for reflecting the reference light to the beam splitting prism.
Optionally, the transmission type diffuse reflection medium density measurement module includes:
the medium to be measured measuring area is used for setting the medium to be measured;
and the diffuse reflection object is used for uniformly reflecting the measuring light to form return light returned in the original path after the measuring light passes through the measuring area of the medium to be measured.
Optionally, the transmissive diffuse reflection medium density measurement module further comprises:
the first optical window and the second optical window are arranged on two sides of the medium measuring area to be measured.
Optionally, the diffuse reflecting object is arranged on the vibration isolation pad.
Another aspect of the present disclosure provides an in-situ density measurement method based on diffuse reflection laser heterodyne coherence, which is applied to the in-situ density measurement device based on diffuse reflection laser heterodyne coherence in the first aspect, and the method includes:
Emitting detection laser;
Dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through a transmission type diffuse reflection medium density measurement module to detect the coupling with the medium to be detected, enabling a return light source path of the measurement light to return to the heterodyne coherence module through a diffuse reflection object, and interfering with the reference light to generate an interference light signal;
demodulating the interference light signal and outputting a phase change signal of the measuring light caused by the medium to be measured;
and obtaining the density of the medium to be measured based on the phase change signal.
Optionally, the demodulating the interference light signal, outputting the phase change of the measurement light caused by the medium to be measured includes:
converting the interference light information into an electrical signal;
And demodulating the electric signal based on a heterodyne intermediate frequency signal demodulation algorithm to obtain a phase change signal of the medium to be detected.
Optionally, the obtaining the density of the medium to be measured based on the phase change includes:
Obtaining the refractive index of the medium to be measured based on the mapping relation between the phase change signal and the refractive index of the medium to be measured;
and obtaining the density of the medium to be measured based on the mapping relation between the refractive index and the density of the medium to be measured.
The above at least one technical scheme adopted in the embodiment of the disclosure can achieve the following beneficial effects:
the in-situ density measurement device and method based on the heterodyne coherence of the diffuse reflection laser can realize the density measurement of gaseous, liquid and gas-liquid media under the high-precision and large dynamic range, and solves the problems existing in the prior interferometry of the density of the media by combining heterodyne and diffuse reflection objects as a method for detecting light reflection on the basis of a Mach-Zehnder interferometer, thereby improving the coherent optical density measurement technology and realizing the in-situ measurement of the density of the media under the large dynamic range and high precision.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of an in-situ density measurement device based on heterodyne coherence of diffusely reflected laser light provided by an embodiment of the present disclosure;
FIG. 2 schematically illustrates a schematic configuration of a heterodyne coherence module provided by an embodiment of the present disclosure;
FIG. 3 schematically illustrates a block diagram of a transmissive diffuse reflection medium density measurement module provided by an embodiment of the present disclosure;
Fig. 4 schematically illustrates a flowchart of an in-situ density measurement method based on heterodyne coherence of diffusely reflected laser light provided by an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Some of the block diagrams and/or flowchart illustrations are shown in the figures. It will be understood that some blocks of the block diagrams and/or flowchart illustrations, or combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the instructions, when executed by the processor, create means for implementing the functions/acts specified in the block diagrams and/or flowchart.
Fig. 1 schematically illustrates a schematic diagram of an in-situ density measurement device based on heterodyne coherence of a diffusely reflected laser light provided by an embodiment of the present disclosure.
As shown in fig. 1, an in-situ density measurement device based on heterodyne coherence of diffuse reflection laser light provided in an embodiment of the present disclosure includes a laser, a heterodyne coherence module, and a transmissive diffuse reflection medium density measurement module.
The laser is used for generating detection laser. Detecting a medium density measuring medium to be measured by laser, and obtaining medium density information by coupling action of the detection laser and the medium to be measured. In this embodiment, the detection laser is a narrow linewidth laser, and the wavelength range of the detection laser is 400-700 nm, so as to implement density information carrying of the medium to be detected.
The heterodyne coherence module is arranged behind the laser and is used for dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through the transmission type diffuse reflection medium density measurement module to detect a medium to be detected, enabling return light of the measurement light to interfere with the reference light to generate an interference light signal, demodulating the interference light signal and outputting the density of the medium to be detected.
The transmission type diffuse reflection medium density measuring module is arranged behind the heterodyne correlation module and is used for coupling the measuring light with the medium to be measured, and the return light source of the measuring light is returned to the heterodyne correlation module through a diffuse reflection object, so that light deflection does not occur, and the coherence condition is met. The module can realize real-time measurement of three media of gas, liquid and gas-liquid mixture, and meets the density measurement requirements of high sensitivity and large dynamic range.
Fig. 2 schematically illustrates a schematic structure of a heterodyne coherence module according to an embodiment of the present disclosure.
As shown in fig. 2, the heterodyne coherence module includes a first polarization splitting prism, a splitting prism, and a demodulation system.
The first polarization splitting prism is used for splitting the detection laser into measurement light and reference light, and the transmission directions of the measurement light and the reference light can be adjusted. There is no overlap in the optical paths of the measurement light and the reference light.
The beam splitting prism is used for making the return light of the measuring light coherent with the reference light and refracting the coherent light signal to the demodulation system.
And the demodulation system is used for demodulating the interference optical signal to obtain and output the density of the medium to be measured.
In this embodiment, a heterodyne modulator is further disposed on the optical path of the reference light, and is specifically disposed between the first polarization splitting prism and the splitting prism, and is configured to heterodyne modulate the reference light.
In this embodiment, the heterodyne coherence module may further include a second polarization splitting prism and a mirror. The device comprises a first polarization beam splitting prism, a second polarization beam splitting prism, a reflecting mirror and a heterodyne modulator, wherein the first polarization beam splitting prism is arranged between the first polarization beam splitting prism and the beam splitting prism and is used for reflecting return light of measuring light to the beam splitting prism, and the reflecting mirror is arranged between the heterodyne modulator and the beam splitting prism and is used for adjusting the direction of reference light and reflecting the reference light to the beam splitting prism.
After being divided into two beams by the polarization beam splitter prism, one beam of detection laser is used as reference light to reach the reflecting mirror after passing through the heterodyne modulator, and the other beam of measurement light is reflected back by the diffuse reflection object after passing through the polarization beam splitter prism and the lens, and reaches the beam splitter prism to interfere with the reference light, so that the density measurement of the medium to be measured is realized by demodulating and outputting the interference light signal through a signal.
Fig. 3 schematically illustrates a block diagram of a transmissive diffuse reflection medium density measurement module provided by an embodiment of the present disclosure.
As shown in fig. 3, the transmission type diffuse reflection medium density measuring module at least comprises a medium measuring area to be measured and a diffuse reflection object.
The medium to be measured measuring area is used for setting the medium to be measured. The medium to be measured can be gaseous, liquid or gas-liquid medium, and has transmissivity. The first optical window and the second optical window can be arranged on two sides of the medium measuring area to be measured. The detection laser is reflected by the reflector, reaches the detection area through the optical window, reaches the diffuse reflection object through the optical window, passes through the diffuse reflection object, passes through the optical window, passes through the to-be-detected area, the optical window and the reflector, and is received by the lens in the heterodyne coherence module, so that coherence is realized.
And the diffuse reflection object is used for uniformly reflecting the measuring light to form return light returned in the original path after the measuring light passes through the measuring area of the medium to be measured. The diffuse reflection object is a lambertian body with the surface capable of realizing diffuse reflection, and the diffuse reflection object can uniformly reflect the detection light beams in all directions, wherein the lower end of the diffuse reflection object is isolated from external environment vibration through the vibration isolation gasket.
According to the in-situ density measurement device based on the heterodyne coherence of the diffuse reflection laser, which is provided by the embodiment of the disclosure, the density measurement of two-state media of gas, liquid and gas-liquid under the conditions of high precision and large dynamic range can be realized, and on the basis of a Mach-Zehnder interferometer, the problems existing in the prior interferometry of the density of the media are solved by combining heterodyne objects and diffuse reflection objects as a method for detecting light reflection, so that the coherent optical density measurement technology is improved, and the in-situ measurement of the density of the media under the conditions of large dynamic range and high precision is realized.
Fig. 4 schematically illustrates a flowchart of an in-situ density measurement method based on heterodyne coherence of diffusely reflected laser light provided by an embodiment of the present disclosure.
As shown in fig. 4, the in-situ density measurement method based on heterodyne coherence of diffuse reflection laser provided by the embodiment of the present disclosure includes S410 to S440.
S410, emitting detection laser.
In this embodiment, the detection laser is a narrow linewidth laser, and the wavelength range of the detection laser is 400-700 nm, so as to implement density information carrying of the medium to be detected.
S420, dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through a transmission type diffuse reflection medium density measurement module to detect and be coupled with the medium to be detected, enabling a return light source of the measurement light to return to the heterodyne coherence module through a diffuse reflection object, and interfering with the reference light to generate an interference light signal.
In the embodiment, after the detection laser is emitted, the heterodyne coherent module mainly realizes the beam splitting of the detection light and the reference light, wherein the reference light is subjected to heterodyne modulation, the detection light realizes light path directional transmission through an optical element and realizes interference with the reference light, and the transmission type diffuse reflection medium density measuring area mainly realizes the coupling effect between the detection light and a medium to be detected, reaches a diffuse reflection object after coupling, and returns in an original path after the detection light is subjected to diffuse reflection. The optical transmission path of the returned detection light is unchanged through the diffuse reflection object, so that the coherence of the two beams of light is ensured, and the problem of coherence reduction or failure caused by deflection of the detection light is avoided.
S430, demodulating the interference light signal, and outputting a phase change signal of the measuring light caused by the medium to be measured.
S430 includes S431-S432.
S431, converting the interference light information into an electrical signal.
S432, demodulating the electric signal based on a heterodyne intermediate frequency signal demodulation algorithm to obtain a phase change signal of the medium to be detected.
In this embodiment, a conventional heterodyne intermediate frequency signal demodulation algorithm is adopted to implement phase output of a medium to be measured, where the phase information signal carrying the medium to be measured is:
Wherein A is a direct current signal caused by the light intensity of interference light, B is the intensity of the interference light, C is heterodyne modulation radian, For the phase change caused by the medium to be measured,Is the initial phase.
The phase signal output can be realized through demodulation, and the demodulated medium phase signal to be measured is:
Wherein lambda is wavelength, L is detection laser transmission optical path change.
S440, obtaining the density of the medium to be measured based on the phase change signal.
S440 includes S441 to S442.
S441, obtaining the refractive index of the medium to be measured based on the mapping relation between the phase change signal and the refractive index of the medium to be measured.
In this embodiment, the optical path and phase theoretical formula are combined:
L=n×s;
Wherein n is the refractive index of the medium to be measured, s is the transmission path, here a constant.
S442, obtaining the density of the medium to be measured based on the mapping relation between the refractive index and the density of the medium to be measured.
In this embodiment, the equation is based on Gladstone-Dale:
n=kρ+1;
Where n is the refractive index of the medium to be measured, ρ is the density of the medium to be measured, and k is the Grade Ston-Del constant of the detection laser wavelength of the test system.
Based on the above formula, a density calculation formula can be obtained:
the invention provides an in-situ density measurement method based on diffuse reflection laser heterodyne coherence, which can realize simultaneous measurement of two-state densities of a large dynamic range and gas and liquid, overcomes the problem of small dynamic range of the conventional coherent density monitoring device, and can realize in-situ density measurement in a marine environment with high precision and difficult environmental influence.
Those skilled in the art will appreciate that the features recited in the various embodiments of the disclosure and/or in the claims may be provided in a variety of combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, the features recited in the various embodiments of the present disclosure and/or the claims may be variously combined and/or combined without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of the present disclosure.
While the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. The scope of the disclosure should, therefore, not be limited to the above-described embodiments, but should be determined not only by the following claims, but also by the equivalents of the following claims.
Claims (6)
1. An in-situ density measurement device based on heterodyne coherence of diffuse reflection laser, which is characterized by comprising:
A laser for generating a detection laser;
The heterodyne coherence module is arranged behind the laser and is used for dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through the transmission diffuse reflection medium density measurement module to detect a medium to be detected, enabling return light of the measurement light to interfere with the reference light to generate an interference light signal, demodulating the interference light signal and outputting the density of the medium to be detected;
Wherein the heterodyne coherence module includes:
the first polarization beam splitting prism is used for splitting the detection laser into measuring light and reference light;
a beam splitter prism for making the return light of the measurement light coherent with the reference light;
The demodulation system is used for demodulating the interference optical signals to obtain and output the density of the medium to be measured;
The heterodyne modulator is arranged between the first polarization beam splitting prism and the beam splitting prism and is used for heterodyne modulating of the reference light;
the second polarization beam splitting prism is arranged between the first polarization beam splitting prism and the beam splitting prism and is used for reflecting the return light of the measuring light to the beam splitting prism;
The reflecting mirror is arranged between the heterodyne modulator and the beam splitting prism and is used for reflecting the reference light to the beam splitting prism;
The transmission type diffuse reflection medium density measurement module is arranged behind the heterodyne coherence module and is used for coupling the measurement light with the medium to be measured and returning the return light source of the measurement light to the heterodyne coherence module through a diffuse reflection object;
wherein, transmission formula diffuse reflection medium density measurement module includes:
the medium to be measured measuring area is used for setting the medium to be measured, wherein the medium to be measured comprises a gaseous medium, a liquid medium and a gas-liquid medium, and has transmissivity;
and the diffuse reflection object is used for uniformly reflecting the measuring light to form return light returned in the original path after the measuring light passes through the measuring area of the medium to be measured.
2. The diffuse reflection laser heterodyne coherence based in situ density measurement device of claim 1, wherein the transmissive diffuse reflection medium density measurement module further comprises:
the first optical window and the second optical window are arranged on two sides of the medium measuring area to be measured.
3. The in-situ density measurement device based on heterodyne coherence of a diffusely reflected laser light of claim 1, wherein the diffusely reflected object is disposed on a vibration isolation pad.
4. An in-situ density measurement method based on diffuse reflection laser heterodyne coherence, which is applied to the in-situ density measurement device based on diffuse reflection laser heterodyne coherence as claimed in any one of claims 1 to 3, and is characterized in that the method comprises the following steps:
Emitting detection laser;
Dividing the detection laser into measurement light and reference light, enabling the measurement light to pass through a transmission type diffuse reflection medium density measurement module to detect the coupling with the medium to be detected, enabling a return light source path of the measurement light to return to the heterodyne coherence module through a diffuse reflection object, and interfering with the reference light to generate an interference light signal;
demodulating the interference light signal and outputting a phase change signal of the measuring light caused by the medium to be measured;
and obtaining the density of the medium to be measured based on the phase change signal.
5. The method of claim 4, wherein demodulating the interference light signal and outputting the phase change of the measurement light caused by the medium to be measured comprises:
converting the interference optical signal into an electrical signal;
And demodulating the electric signal based on a heterodyne intermediate frequency signal demodulation algorithm to obtain a phase change signal of the medium to be detected.
6. The method for in-situ density measurement based on heterodyne coherence of a diffusely reflected laser light according to claim 4, wherein the obtaining the density of the medium under test based on the phase change comprises:
Obtaining the refractive index of the medium to be measured based on the mapping relation between the phase change signal and the refractive index of the medium to be measured;
and obtaining the density of the medium to be measured based on the mapping relation between the refractive index and the density of the medium to be measured.
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| CN106979907A (en) * | 2017-04-11 | 2017-07-25 | 南京邮电大学 | A kind of digital liquid refraction by prism instrument based on line array CCD |
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