CN209400417U - A kind of measuring device for liquid refractive index - Google Patents
A kind of measuring device for liquid refractive index Download PDFInfo
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- CN209400417U CN209400417U CN201821719124.5U CN201821719124U CN209400417U CN 209400417 U CN209400417 U CN 209400417U CN 201821719124 U CN201821719124 U CN 201821719124U CN 209400417 U CN209400417 U CN 209400417U
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- refractive index
- measuring device
- light beam
- optical resin
- liquid refractive
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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
- G01N21/4133—Refractometers, e.g. differential
-
- 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
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
Abstract
The utility model relates to a kind of measuring device for liquid refractive indexes, comprising: to generate the light source, the optical resin prism to deflecting light beams and the imaging sensor to receive light beam image of light beam；The optical resin prism includes the plane of incidence that light beam can be made to enter, the first surface contacted with quantity of fluid to be measured, second surface, third surface and the outgoing plane that light beam can be made to project；The first surface contacted with quantity of fluid to be measured, second surface, third surface can make at least partly light formation total reflection in light beam, be respectively formed the first the reflected beams, the second the reflected beams and third the reflected beams.Influence of the bubble to measuring refractive indexes of liquid in testing liquid is reduced as a result, meanwhile, promote device miniaturization.
Description
Technical field
The utility model relates to a kind of field of measuring technique more particularly to a kind of measuring device for liquid refractive indexes.
Background technique
In the prior art, refractive index is one of important optical parameter of liquid, will appreciate that the optics of liquid by refractive index
The properties such as performance, purity, concentration and dispersion, other some parameters (such as temperature) are also closely related with refractive index.Therefore, liquid
The measurement of body refractive index has important meaning in chemical industry, medicine, food, petroleum etc. field.
Cirtical angle of total reflection imaging method is a kind of measurement method of common liquid refractivity, be according to total reflection principle,
It is in the angle of emergence of critical angle light by measuring, calculates the refractive index of quantity of fluid to be measured.As shown in Figure 1, a kind of typical
Cirtical angle of total reflection measuring system includes light source U1, prism U3, imaging sensor U2, when work, the light beam that is issued from light source U1
The interface that fluid to be measured X and prism U3 are reached across prism U3, in the interfacial separation at refraction light and reflected light, wherein reflection
Light is received by imaging sensor U2, generates shaded-image shown in right side as shown in figure 1.In the shaded-image, bright part is right
The light that should be totally reflected at the interface of detected solution X and prism U3, the corresponding light not being totally reflected in dark part are bright
The then corresponding critical angle being totally reflected of dark line of demarcation.Due to the variations in refractive index of detected solution will lead to generation total reflection it is critical
The variation at angle, therefore the position by measuring the bright-dark cut, so that it may the cirtical angle of total reflection is found out, so as to find out test solution
The refractive index of body.
But when containing bubble in quantity of fluid to be measured, this single total reflection measurement method not can avoid bubble
Interference to measurement, realization accurately measure.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of measuring device for liquid refractive indexes, existing to solve
The problem of measuring refractive indexes of liquid inaccuracy in technology.
One aspect according to the present utility model provides a kind of measuring device for liquid refractive index, comprising:
To generate the light source, the optical resin prism to deflecting light beams and the linear array to receive light beam image of light beam
Imaging sensor；
The optical resin prism includes the plane of incidence that light beam can be made to enter, the first table contacted with quantity of fluid to be measured
Face, second surface, third surface and the outgoing plane that light beam can be made to project；The first surface contacted with quantity of fluid to be measured,
Second surface, third surface can make at least partly light formation total reflection in light beam.
Collimating lens are set between the light source and optical resin prism；
The light beam that the light source issues is after the collimation lens, into the plane of incidence of the optical resin prism.
The collimation lens is made of 2 optical surfaces of aspherical mirror and Bao Weier prism.
The first surface and central symmetry of the third surface relative to the optical resin prism.
The second surface is parallel with the plane of incidence and the outgoing plane.
The plane of incidence, first surface, second surface, third surface, outgoing plane and the optical resin prism are integrated
Molding.
The refractive index of the optical resin prism is between 1.50-1.75；
The plane of incidence is toric lens；
The outgoing plane is cylindrical mirror.
The optical resin prism uses optical-grade transparent resin material.
Beneficial effect using the above scheme is:
The measuring device for liquid refractive index of the utility model embodiment, by using in optical resin prism and liquid to be measured
The corresponding relationship of the refractive index of the light beam image and the quantity of fluid to be measured that are totally reflected on multiple contact surfaces of body, it is to be measured to calculate this
The refractive index of quantity of fluid, so that bubble in liquid to be measured has obtained elimination/inhibition to the interference of measurement result, to improve
The adaptability of measuring device.Meanwhile reducing the volume of measuring device.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of measuring refractive indexes of liquid equipment in the prior art；
Fig. 2 is the optical principle schematic diagram for the measuring device for liquid refractive index that the utility model embodiment 1 provides；
Fig. 3 is the optical principle schematic diagram for the measuring device for liquid refractive index that the utility model embodiment 2 provides；
Fig. 4 is the optical principle schematic diagram for the measuring device for liquid refractive index that the utility model embodiment 3 provides；
Fig. 5 is the light path schematic diagram for the measuring device for liquid refractive index that the utility model embodiment 3 provides；
Fig. 6 is the solution bubble interference principle signal for the measuring device for liquid refractive index that the utility model embodiment 3 provides
Figure；
Fig. 7~9 are the ray-tracing simulations schematic diagram that the utility model embodiment 3 provides.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In each embodiment of the utility model, multiple total reflection can be realized, it will be due to the work of bubble in liquid to be measured
With and generate extra total reflection light again by the contact surface of prism and quantity of fluid to be measured, reflect the present apparatus.To reach
It is accurately totally reflected the effect of light to screening, avoids/reduce influence of the bubble to measurement.Meanwhile the miniaturization of realization device.
Embodiment one
As shown in Fig. 2, the utility model embodiment 1 provides a kind of measuring device for liquid refractive index, comprising:
Light source U1, preferably laser light source, for limiting the incident angle of incident beam；
Optical resin prism U3, including the plane of incidence, the first surface S2 contacted with quantity of fluid C to be measured, second surface S3,
Three surface S4 and outgoing plane S5.
The light beam that light source U1 is issued is incident in optical resin prism U3 through the plane of incidence to form incident beam, the incidence
Light beam is propagated in the optical resin prism U3 and at least partly light and quantity of fluid C to be measured are sent out on the first surface S2
To form the first the reflected beams, first the reflected beams are propagated in the optical resin prism U3 and described for raw total reflection
It is contacted again with quantity of fluid C to be measured on second surface S3 and total reflection occurs to form the second the reflected beams, second reflection
Light beam is propagated in the optical resin prism U3 and contacts and occur with quantity of fluid C to be measured again on the third surface S4
To form third the reflected beams, the third the reflected beams are projected through the outgoing plane S5 for total reflection；
Imaging sensor U4, preferably line scan image sensor, for acquiring the third reflected light projected through outgoing plane S5
The image of beam.
The present embodiment can also include a refractive index computing module (not shown), for according to third the reflected beams
Image and the corresponding relationship of refractive index calculate the refractive index of quantity of fluid C to be measured.
The measuring device for liquid refractive index of the utility model embodiment, by using in optical resin prism U3 and to be measured
The corresponding relationship of the refractive index of the light beam image of multiple total reflection and the quantity of fluid C to be measured on the contact surface of liquid C, to calculate this
The refractive index of quantity of fluid C to be measured, so that bubble has obtained elimination/inhibition to the interference of measurement result in quantity of fluid C to be measured.To
Improve the measurement accuracy of measuring device, the reliability of measurement and adaptability.Meanwhile reducing the volume of measuring device.
Preferably, the light source is laser light source.
Preferably, the first surface S2 and center pair of the third surface S4 relative to the optical resin prism U3
Claim.
Preferably, the second surface S3 is parallel with the plane of incidence and the outgoing plane S5.
Embodiment 2
As shown in figure 3, the utility model embodiment 2 provides a kind of measuring device for liquid refractive index, in the base of embodiment 1
On plinth, the present embodiment further comprises:
Collimation lens U2 is set between light source U1 and optical resin prism U3, for converging the light issued from light source U1
Beam is to be incident in optical resin prism U3.And the main shaft of collimation lens U2 is overlapped with the center of light source.
Further, collimation lens U2 is made of 2 optical surfaces, and an optical surface is aspherical mirror；Another optical surface
For Bao Weier prism (powerwell lens).
Embodiment 3
As shown in figure 4, the utility model embodiment 3 provides a kind of measuring device for liquid refractive index, in the base of embodiment 2
On plinth, the present embodiment further comprises plane of incidence S1 and outgoing plane S5.Plane of incidence S1 is used to control incident light angle certain
In range；Outgoing plane S5 is used to expand the angle of outgoing beam.
Further, plane of incidence S1 is toric lens.
Further, outgoing plane S5 is cylindrical mirror.
Preferably, the plane of incidence S1 and outgoing plane S5 and optical resin prism U3 is integrally formed, it is highly preferred that being to use
Optical-grade transparent resin material；Using Shooting Technique integrated molding, to ensure the assembly consistency of optical component.
Specifically, as shown in figure 5, incident beam reaches the first table that optical resin prism U3 is contacted with quantity of fluid C to be measured
When the S2 of face, ranges of incidence angles is a1-a2, and the cirtical angle of total reflection corresponding with quantity of fluid C to be measured is ac, less than the critical angle
Light (a1-ac) reflects the present apparatus, and the light (ac-a2) greater than the critical angle is totally reflected, and forms the first the reflected beams,
Continuation is propagated in optical resin prism U3, and reaches second surface S3.At this moment, the incident angle of light beam is between a3-a4, and
Greater than ac.Therefore, which is totally reflected, and forms the second the reflected beams, continuation is propagated in optical resin prism U3, and is arrived
Up to third surface S4.At this moment, the incident angle of light beam is between a7-a8, since S2 and S4 is symmetric relation, a7-a8 and ac-a2
It is equal, it is greater than ac.Therefore, the second the reflected beams are totally reflected, and form third the reflected beams, are continued in optical resin prism U3
Middle propagation, and reach outgoing plane S5.And projected after the diffusion of S5, arrive at line scan image sensor U4.
If there is bubble in quantity of fluid C to be measured, bubble is in suspended state, does not contact with optical resin prism U3, not shadow
Ring the measurement of the present apparatus.
Bubble contacts with the surface S2 of optical resin prism U3 and is located between ac-a2.Due to being gas, gas in bubble
Refractive index be much smaller than quantity of fluid C to be measured.Therefore, light beam is equally totally reflected, and does not influence the measurement of the present apparatus.
Bubble contacts with the surface S2 of optical resin prism U3 and is located between a1-ac.Due to being gas, gas in bubble
Refractive index be much smaller than quantity of fluid C to be measured.Therefore, light beam is equally totally reflected, and will generate extra total reflection light beam, is such as schemed
Shown in 6.
Extra light beam and the second useful the reflected beams form compound total reflection light beam, pass in optical resin prism U3
It broadcasts, arrives at the surface S3.At this moment, total reflection light beam incident angle extra in compound total reflection light beam is between a4-a5, and is greater than
ac.Therefore, which is totally reflected, and continuation is propagated in optical resin prism U3, and reaches third surface S4.This
When, the compound incident angle for being totally reflected total reflection light beam extra in light beam is between a6-a7, since S2 and S4 is symmetrical closes
System, a6-a7 is equal with a1-ac, is less than ac.Therefore, extra light beam will reflect the present apparatus, and useful light beam continues in light
It learns and is propagated in resin prism U3, form third the reflected beams, and project after reaching outgoing plane S5, do not influence the measurement of the present apparatus.
Bubble is not only contacted with the surface S2 of optical resin prism U3, and between a1-ac.Meanwhile there are also bubble with
The surface S4 of optical resin prism U3 contacts, and between a6-a7.Extra light beam can not reflect the present apparatus, be formed multiple
It closes total reflection light beam to project through outgoing plane S5, then will affect the measurement of the present apparatus.
Referring to Fig. 7~9, embodiment 3 according to the present utility model is measured using the present apparatus that ray tracking soft simulates
When the quantity of fluid C to be measured of different refractivity, image of the third the reflected beams in line scan image sensor.
Fig. 7 is to measure the image that refractive index is 1.3330 (deionized waters).
Fig. 8 is to measure the image that refractive index is 1.4250 liquid.
Fig. 9 is to measure the image that refractive index is 1.5230 liquid.
In conclusion can be realized multiple total reflection in each embodiment of the utility model, it will be due in quantity of fluid to be measured
The effect of bubble and the extra total reflection light generated reflects this dress again by the contact surface of prism and quantity of fluid to be measured
It sets.To have the function that screening accurately total reflection light, influence of the bubble to measurement is avoided/reduced.Meanwhile realization device
Miniaturization.
The measuring device for liquid refractive index and method of the utility model embodiment, by using optical resin prism and to
The corresponding relationship of the refractive index of the light beam image and the quantity of fluid to be measured that are totally reflected on multiple contact surfaces of liquid is measured, to calculate
The refractive index of the quantity of fluid to be measured, so that bubble in liquid to be measured has obtained elimination/inhibition to the interference of measurement result, thus
Improve the adaptability of measuring device.Meanwhile reducing the volume of measuring device.
It should be understood by those skilled in the art that, the embodiments of the present invention can provide as method, system or computer
Program product.Therefore, the utility model can be used complete hardware embodiment, complete software embodiment or combine software and hardware
The form of the embodiment of aspect.Moreover, it wherein includes computer available programs that the utility model, which can be used in one or more,
The computer implemented in the computer-usable storage medium (including but not limited to magnetic disk storage and optical memory etc.) of code
The form of program product.
The utility model is produced referring to according to the method, equipment (system) and computer program of the utility model embodiment
The flowchart and/or the block diagrams of product describes.It should be understood that can be realized by computer program instructions in flowchart and/or the block diagram
Each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these meters
Calculation machine program instruction is to the place of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
Device is managed to generate a machine, so that producing by the instruction that computer or the processor of other programmable data processing devices execute
Life is for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
Device.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (10)
1. a kind of measuring device for liquid refractive index characterized by comprising
To generate the light source of light beam, form the optical resin prism of incident beam to deflecting light beams and to receive emergent light
The imaging sensor of beam images；
The optical resin prism includes the plane of incidence that light beam can be made to enter, the first surface contacted with quantity of fluid to be measured, the
Two surfaces, third surface and the outgoing plane that light beam can be made to project；The first surface contacted with quantity of fluid to be measured, the second table
Face, third surface can make at least partly light formation total reflection in light beam, be respectively formed the first the reflected beams, the second reflected light
Beam and third the reflected beams.
2. measuring device for liquid refractive index according to claim 1, which is characterized in that the light source and optical resin prism
Between setting one combing light beam collimation lens.
3. measuring device for liquid refractive index according to claim 2, which is characterized in that the collimation lens is by aspherical mirror
With 2 optical surface compositions of Bao Weier prism.
4. measuring device for liquid refractive index according to claim 1, which is characterized in that the first surface and the third
Central symmetry of the surface relative to the optical resin prism.
5. measuring device for liquid refractive index according to claim 1, which is characterized in that the second surface and the incidence
Face is parallel with the outgoing plane.
6. measuring device for liquid refractive index according to claim 1, which is characterized in that the plane of incidence, first surface,
Two surfaces, third surface, outgoing plane and the optical resin prism are integrally formed.
7. measuring device for liquid refractive index according to claim 1, which is characterized in that the refraction of the optical resin prism
Rate is between 1.50-1.75.
8. measuring device for liquid refractive index according to claim 1, which is characterized in that the plane of incidence is that double-curved surface is saturating
Mirror.
9. measuring device for liquid refractive index according to claim 1, which is characterized in that the outgoing plane is cylindrical mirror.
10. measuring device for liquid refractive index according to claim 1, which is characterized in that the optical resin prism uses
Optical-grade transparent resin material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821719124.5U CN209400417U (en) | 2018-10-23 | 2018-10-23 | A kind of measuring device for liquid refractive index |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821719124.5U CN209400417U (en) | 2018-10-23 | 2018-10-23 | A kind of measuring device for liquid refractive index |
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| Publication Number | Publication Date |
|---|---|
| CN209400417U true CN209400417U (en) | 2019-09-17 |
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| CN201821719124.5U Active CN209400417U (en) | 2018-10-23 | 2018-10-23 | A kind of measuring device for liquid refractive index |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022067361A1 (en) * | 2020-09-30 | 2022-04-07 | Anton Paar Gmbh | Method and refractometer for determining the critical angle of the total reflection in a liquid sample |
-
2018
- 2018-10-23 CN CN201821719124.5U patent/CN209400417U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022067361A1 (en) * | 2020-09-30 | 2022-04-07 | Anton Paar Gmbh | Method and refractometer for determining the critical angle of the total reflection in a liquid sample |
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