CN115508310A - 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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- CN115508310A CN115508310A CN202211222978.3A CN202211222978A CN115508310A CN 115508310 A CN115508310 A CN 115508310A CN 202211222978 A CN202211222978 A CN 202211222978A CN 115508310 A CN115508310 A CN 115508310A
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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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Abstract
The invention discloses an in-situ measuring instrument and method for liquid refractive index, belonging to the field of optical precision measurement, wherein the measuring instrument is composed of a measuring main body (1), a cable (2) and a control and data processing system (3), wherein the measuring main body (1) comprises an image acquisition module (101), a laser projector (102), a sealed cabin body (103), a glass window (104), a measuring platform (105) and a fixed block (106). The measuring method comprises the following steps: and immersing the measuring device main body into 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 fast without complex operation, the measurement result can be displayed by the control and data processing system in real time, and the instrument has compact structure, is portable and portable.
Description
Technical Field
The invention belongs to the field of optical precision measurement, and particularly relates to an in-situ measurement instrument and method for a liquid refractive index.
Background
There are many methods for measuring the refractive index of a liquid, including laser irradiation, diffraction grating, fiber-optic Young's interferometry, 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 liquid refractive index measuring instrument and a method.
The technical scheme adopted by the invention for solving the technical problem 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 sends 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 sealed cabin body, a glass window, a measuring platform and a fixed block, the image acquisition module and the laser projector form a certain included angle and are fixed in the sealed cabin body, the sealed cabin body and the fixed block are installed on the measuring platform, the glass window is fixed at the front end of the sealed cabin body, and the physical distance between the outer side of the glass window and the fixed 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 a point laser, and the point light source is visible light with various wavelengths.
Further, the point light source is green laser.
Further, the image acquisition module is used for imaging the light spots, and the image sensor type of the image acquisition module is CCD or CMOS.
The invention also provides the following technical scheme:
an in-situ liquid refractive index measuring method based on the in-situ liquid refractive index measuring instrument comprises the following steps:
a, immersing a measuring main body into liquid to be measured;
b, starting a control and data processing system;
c, starting the laser projector and the image acquisition module, enabling the laser projector to project laser to intersect with the surface of the fixed block to form a light spot, imaging the light spot at a certain position of an image sensor of the image acquisition module, acquiring image information in real time by the control and data processing system, and calculating the distance D between the outer side of the glass window and the fixed block in the liquid at the moment w Said D is w The data measured for the measuring subject is not the true physical distance;
according to the physical distance D and the distance D w Calculating the refractive index n of the liquid to be measured w And the control and data processing system displays the measurement result in real time.
Further, in step C, the control and data processing system calculates the distance D according to laser triangulation w 。
Further, in step D, the refractive index n of the liquid to be measured is calculated by the following formula w ：
Wherein H is the distance between the focal point of the lens 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 is the distance between the focal point of the lens of the image acquisition module and the laser projector g Is the refractive index of the glass window.
The beneficial effects of the invention are: the liquid refractive index in-situ measuring instrument and the method are used for carrying out in-situ measurement on the liquid refractive index, the method is simple, fast and free of complex operation, the measurement result can be displayed by the control processing system in real time, and the instrument is compact in structure, light and portable.
Drawings
FIG. 1 is a schematic diagram of an in situ measurement apparatus for refractive index of a liquid according to the present invention;
FIG. 2 is a schematic view of a measurement body of an in-situ measurement apparatus for refractive index of liquid according to the present invention;
FIG. 3 is a schematic diagram illustrating the measurement principle of the in-situ measurement method for the refractive index of liquid according to the present invention;
the reference numbers in the figures are: the device comprises a measurement main body 1, a cable 2, a control and data processing system 3, an image acquisition module 101, a laser projector 102, a sealing cabin 103, a glass window 104, a measurement platform 105 and a fixing block 106.
Detailed Description
The invention is further described with reference to the following figures and detailed description:
as shown in fig. 1, the instrument for in-situ measurement of liquid refractive index 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.
As shown in fig. 2, the measurement main body 1 includes an image acquisition module 101, a laser projector 102, a sealed cabin 103, a glass window 104, a measurement platform 105 and a fixing block 106, 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 at 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 measurement 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 laser, green laser, blue laser, 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, an in-situ measurement method for refractive index of liquid includes the following steps:
a, immersing a measuring main body 1 into liquid to be measured;
b, starting a control and data processing system 3;
step C, starting the laser projector 102 and the image acquisition module 101, enabling the laser projector 102 to project laser to intersect with the surface of the fixed block 106 to form a light spot, enabling the light spot to form an image at a certain position of an image sensor of the image acquisition module 101, enabling the control and data processing system 3 to acquire image information in real time, and calculating the distance Dw between the outer side of the glass window 104 and the fixed block 106 in liquid at the moment according to a laser triangulation method, wherein the Dw is a data which is measured by the measurement main body 1 and is not a real physical distance;
d, calculating the refractive index n of the liquid to be measured by a formula w And the measurement results are displayed in real time by the control and data processing system 3.
The formula is expressed as follows:
the refractive index n of the liquid to be measured can be obtained by the three formulas w Comprises the following steps:
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 is g Is the refractive index of the glass window, D is the distance between the outside of the glass window and the fixed block, D w Is in a liquid stateMeasuring the measured data of the subject; the above formula or θ a, θ g, and θ w in fig. 3 are the angles between the light received by the image sensor and the normal vector of the glass interface in the air, the glass, and the water, respectively.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (8)
1. The in-situ measuring instrument for the refractive index of the liquid is characterized by comprising a measuring main body (1), a cable (2) and a control and data processing system (3), wherein the measuring main body (1) is electrically connected with the control and data processing system (3) through the cable (2), and the measuring main body (1) sends measuring 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 sealed 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) form a certain included angle and are fixed in the sealed cabin body (103), the sealed cabin body (103) and the fixing block (106) are installed on the measuring platform (105), the glass window (104) is fixed at the front end of the sealed cabin body (103), and the physical distance between the outer side of the glass window (104) and the fixing block (106) is D.
2. The in-situ liquid refractive index measuring instrument according to claim 1, wherein the laser projector (102) is used for projecting laser light onto the surface of the fixed block (106), the laser light intersects the surface profile of the fixed block (106) to form a light spot, and the laser light is point laser light or line laser light.
3. The in-situ measuring apparatus for refractive index of liquid as claimed in claim 2, wherein the laser is a point laser, and the point light source is visible light with various wavelengths.
4. The in-situ liquid refractive index measuring instrument according to claim 3, wherein the point light source is a green laser.
5. An in-situ measuring instrument for refractive index of liquid as claimed in claim 2, wherein the image acquisition module (101) is used for imaging the light spot, and the image sensor type is CCD or CMOS.
6. An in-situ measurement method of liquid refractive index based on the in-situ measurement apparatus of liquid refractive index according to any one of claims 1 to 5, comprising the steps of:
a, immersing a measuring main body (1) into liquid to be measured;
b, starting a control and data processing system (3);
c, starting the laser projector (102) and the image acquisition module (101), enabling the laser projector (101) to project laser to intersect with the surface of the fixed block (106) to form a light spot, imaging the light spot at a certain position of an image sensor of the image acquisition module (101), acquiring image information in real time by the control and data processing system (3), and calculating the distance D between the outer side of the glass window (104) and the fixed block (106) in liquid at the moment w Said D is w The data measured for the measuring subject (1) is not a true physical distance;
according to the physical distance D and the distance D w Calculating the refractive index n of the liquid to be measured w And the control and data processing system (3) displays the measurement results in real time.
7. Method for in-situ measurement of the refractive index of a liquid according to claim 6, wherein in step C the control and data processing system (3) calculates the distance D according to laser triangulation w 。
8. The in-situ liquid refractive index measurement method according to claim 7,
in step D, the solution to be tested is calculated by the following formulaRefractive index n of bulk w ：
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 is g Is the refractive index of the glass window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211222978.3A CN115508310A (en) | 2022-10-08 | 2022-10-08 | Liquid refractive index in-situ measuring instrument and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211222978.3A CN115508310A (en) | 2022-10-08 | 2022-10-08 | Liquid refractive index in-situ measuring instrument and method |
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| Publication Number | Publication Date |
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| CN115508310A true CN115508310A (en) | 2022-12-23 |
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| CN202211222978.3A Pending CN115508310A (en) | 2022-10-08 | 2022-10-08 | Liquid refractive index in-situ measuring instrument and method |
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| CN (1) | CN115508310A (en) |
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