CN115508310B - Liquid refractive index in-situ measuring instrument and method - Google Patents
Liquid refractive index in-situ measuring instrument and method Download PDFInfo
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- CN115508310B CN115508310B CN202211222978.3A CN202211222978A CN115508310B CN 115508310 B CN115508310 B CN 115508310B CN 202211222978 A CN202211222978 A CN 202211222978A CN 115508310 B CN115508310 B CN 115508310B
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- 239000007788 liquid Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011065 in-situ storage Methods 0.000 title abstract description 5
- 239000011521 glass Substances 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000012625 in-situ measurement Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a liquid refractive index in-situ measuring instrument and a method, which belong to the field of optical precision measurement, wherein the measuring instrument consists of a measuring main body (1), a cable (2) and a control and data processing system (3), and the measuring main body (1) comprises an image acquisition module (101), a laser projector (102), a sealed cabin (103), a glass window (104), a measuring platform (105) and a fixed block (106). The measuring method comprises the following steps: immersing the main body of the measuring device into the liquid to be measured, starting the control and data processing system, calculating the refractive index n of the liquid to be measured according to a formula, and displaying the measuring result in real time by the control and processing system. The method is simple and quick, does not need complex operation, and the measurement result can be displayed in real time by the control and data processing system.
Description
Technical Field
The invention belongs to the field of optical precision measurement, and particularly relates to a liquid refractive index in-situ measurement instrument and a liquid refractive index in-situ measurement method.
Background
There are many methods for measuring the refractive index of a liquid, including laser irradiation, diffraction grating, optical fiber young's interference, grazing incidence, and the like. These methods have advantages, but have the disadvantages of complicated measurement process, incapability of realizing in-situ measurement, and the like.
Disclosure of Invention
The invention aims to overcome the defects and provide an in-situ measuring instrument and method for the refractive index of liquid.
The technical scheme adopted for solving the technical problems is as follows:
the instrument comprises a measuring main body, a cable and a control and data processing system, wherein the measuring main body is electrically connected with the control and data processing system through the cable, and the measuring main body transmits measuring data to the control and data processing system through the cable;
The measuring main body comprises an image acquisition module, a laser projector, a sealing cabin body, a glass window, a measuring platform and a fixing block, wherein a certain included angle is formed between the image acquisition module and the laser projector and is fixed in the sealing cabin body, the sealing cabin body and the fixing block are arranged on the measuring platform, the glass window is fixed at the front end of the sealing cabin body, and the physical distance between the outer side of the glass window and the fixing block is D.
Further, the laser projector is used for projecting laser to the surface of the fixed block, the laser intersects with the surface profile of the fixed block to form a light spot, and the laser is point laser or line laser.
Further, the laser is point laser, and the point light source is visible light with each wavelength.
Further, the point light source is green laser.
Further, the image acquisition module is used for imaging the light spot, and the type of an image sensor is CCD or CMOS.
The invention also provides the following technical scheme:
A method for in-situ measurement of the refractive index of a liquid based on the in-situ measurement instrument of the refractive index of the liquid, comprising the following steps:
Step A, immersing a measuring main body into liquid to be measured;
Step B, starting a control and data processing system;
Starting a laser projector and an image acquisition module, wherein the laser projector projects laser and intersects with the surface of the fixed block to form a light spot, the light spot forms an image on a certain position of an image sensor of the image acquisition module, a control and data processing system acquires image information in real time, and calculates the distance D w between the outer side of a glass window and the fixed block in liquid at the moment, wherein D w is the data measured by a measuring main body and is not the real physical distance;
and D, calculating the refractive index n w of the liquid to be measured according to the physical distance D and the distance D w, and displaying the measurement result in real time by a control and data processing system.
Further, in step C, the control and data processing system calculates the distance D w according to laser triangulation.
Further, in step D, the refractive index n w of the liquid to be measured is calculated by the following formula:
Wherein H is the distance between the lens focus of the image acquisition module and the laser projector, s is the distance between the laser projector and the inner side of the glass window, t is the thickness of the glass window, and n g is the refractive index of the glass window.
The beneficial effects of the invention are as follows: by using the liquid refractive index in-situ measurement instrument and the liquid refractive index in-situ measurement method, the liquid refractive index in-situ measurement instrument and the liquid refractive index in-situ measurement method are simple and quick, complex operation is not needed, a measurement result can be displayed in real time by a control processing system, and the instrument is compact in structure, light and portable.
Drawings
FIG. 1 is a schematic view of an in situ measurement instrument for refractive index of a liquid according to the present invention;
FIG. 2 is a schematic diagram of a measuring body of an in situ measuring instrument for refractive index of a liquid according to the present invention;
FIG. 3 is a schematic diagram of the measurement principle of an in-situ measurement method of refractive index of a liquid according to the present invention;
the reference numerals in the drawings are: the device comprises a measuring main body 1, a cable 2, a control and data processing system 3, an image acquisition module 101, a laser projector 102, a sealed cabin 103, a glass window 104, a measuring platform 105 and a fixed block 106.
Detailed Description
The invention is further described with reference to the drawings and the detailed description below:
As shown in fig. 1, the instrument for in-situ measurement of the refractive index of a liquid comprises a measuring body 1, a cable 2 and a control and data processing system 3, wherein the measuring body 1 is electrically connected with the control and data processing system 3 through the cable 2, and the measuring body 1 transmits measurement data to the control and data processing system 3 through the cable 2.
As shown in fig. 2, the measuring body 1 includes an image acquisition module 101, a laser projector 102, a sealed cabin 103, a glass window 104, a measuring platform 105 and a fixing block 106, where the laser projector 102 and the image acquisition module 101 form a certain included angle and are fixed in the sealed cabin 103, the glass window 104 is fixed on the front end of the sealed cabin 103, the sealed cabin 103 and the fixing block 106 are respectively installed above two ends of the measuring platform 105, and the physical distance between the front end of the sealed cabin 103 and the fixing block 106 is D.
The laser projector 102 may be a wavelength laser, for example: red, green, blue, etc., the image sensor type of the image acquisition module 101 may be a CCD image sensor or a CMOS image sensor.
As shown in fig. 3, a method for in-situ measurement of refractive index of a liquid includes the steps of:
step A, immersing a measuring main body 1 into liquid to be measured;
Step B, starting a control and data processing system 3;
Step C, starting a laser projector 102 and an image acquisition module 101, wherein the laser projector 102 projects laser and intersects with the surface of a fixed block 106 to form a light spot, the light spot is imaged at a certain position of an image sensor of the image acquisition module 101, a control and data processing system 3 acquires image information in real time, and the distance Dw between the outer side of a glass window 104 and the fixed block 106 in liquid at the moment can be calculated according to a laser triangulation method, wherein the Dw is the data measured by a measuring main body 1 and is not the actual physical distance;
And D, calculating the refractive index n w of the liquid to be measured through a formula, and displaying the measurement result in real time by the control and data processing system 3.
The formula is expressed as follows:
The refractive index n w of the liquid to be measured can be obtained by the three formulas:
Wherein H is the distance between the lens focus of the image acquisition module and the laser projector, s is the distance between the laser projector and the inner side of the glass window, t is the thickness of the glass window, n g is the refractive index of the glass window, D is the distance between the outer side of the glass window and the fixed block, and D w is the data measured by measuring the main body in liquid; the above formulas or θa, θg and θw in fig. 3 are included angles between the light received by the image sensor and normal vector of the glass interface in air, glass and water respectively.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. A method for in-situ measurement of the refractive index of a liquid refractive index in-situ measurement instrument, characterized in that the instrument comprises a measurement main body (1), a cable (2) and a control and data processing system (3), wherein the measurement main body (1) is electrically connected with the control and data processing system (3) through the cable (2), and the measurement main body (1) sends measurement data to the control and data processing system (3) through the cable (2);
the measuring main body (1) comprises an image acquisition module (101), a laser projector (102), a sealing cabin body (103), a glass window (104), a measuring platform (105) and a fixing block (106), wherein the image acquisition module (101) and the laser projector (102) are fixed in the sealing cabin body (103) at a certain included angle, the sealing cabin body (103) and the fixing block (106) are arranged on the measuring platform (105), the glass window (104) is fixed at the front end of the sealing cabin body (103), and the physical distance between the outer side of the glass window (104) and the fixing block (106) is D;
The method comprises the following steps:
step A, immersing a measuring main body (1) into liquid to be measured;
Step B, starting a control and data processing system (3);
Step C, starting a laser projector (102) and an image acquisition module (101), wherein the laser projector (101) projects laser and intersects with the surface of a fixed block (106) to form a light spot, the light spot forms an image on a certain position of an image sensor of the image acquisition module (101), a control and data processing system (3) acquires image information in real time, and calculates the distance D w between the outer side of a glass window (104) and the fixed block (106) in liquid at the moment, wherein D w is the data measured by a measuring main body (1) and is not the actual physical distance; a control and data processing system (3) calculates the distance D according to a laser triangulation method w;
Step D, calculating the refractive index n w of the liquid to be measured according to the physical distance D and the distance D w, and displaying the measurement result in real time by a control and data processing system (3);
The refractive index n w of the liquid to be measured is calculated by the following formula:
；
Wherein H is the distance between the lens focus of the image acquisition module and the laser projector, s is the distance between the laser projector and the inner side of the glass window, t is the thickness of the glass window, and n g is the refractive index of the glass window.
2. The method of in-situ measurement of the refractive index of a liquid refractive index in-situ measurement instrument according to claim 1, wherein the laser projector (102) is configured to project a laser onto the surface of the fixed block (106), the laser intersects the surface profile of the fixed block (106) to form a spot, and the laser is a spot laser or a line laser.
3. The method according to claim 2, wherein the laser is a point laser and the point light source is visible light of each wavelength.
4. A method for in-situ measurement of a liquid refractive index in-situ measurement instrument as recited in claim 3, wherein said point light source is a green laser.
5. The method for in-situ measurement of the refractive index of a liquid according to claim 2, wherein the image acquisition module (101) is used for imaging the light spot, and the image sensor is of a CCD or CMOS type.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211222978.3A CN115508310B (en) | 2022-10-08 | 2022-10-08 | Liquid refractive index in-situ measuring instrument and method |
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| CN202211222978.3A CN115508310B (en) | 2022-10-08 | 2022-10-08 | Liquid refractive index in-situ measuring instrument and method |
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| CN115508310A CN115508310A (en) | 2022-12-23 |
| CN115508310B true CN115508310B (en) | 2024-09-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387488A (en) * | 2018-11-29 | 2019-02-26 | 中国科学院光电技术研究所 | Method and instrument for quickly measuring refractive index of optical glass |
| CN111006610A (en) * | 2019-12-13 | 2020-04-14 | 中国科学院光电技术研究所 | Underwater three-dimensional measurement data correction method based on structured light three-dimensional measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204556500U (en) * | 2015-05-04 | 2015-08-12 | 西京学院 | A kind of based on sharp light-struck device for measuring refractive index of transparent liquid |
| JP6713651B2 (en) * | 2015-12-28 | 2020-06-24 | 有限会社折原製作所 | Surface refractive index measuring method and surface stress measuring method using the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387488A (en) * | 2018-11-29 | 2019-02-26 | 中国科学院光电技术研究所 | Method and instrument for quickly measuring refractive index of optical glass |
| CN111006610A (en) * | 2019-12-13 | 2020-04-14 | 中国科学院光电技术研究所 | Underwater three-dimensional measurement data correction method based on structured light three-dimensional measurement |
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| CN115508310A (en) | 2022-12-23 |
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