CN209400418U - 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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- CN209400418U CN209400418U CN201821720231.XU CN201821720231U CN209400418U CN 209400418 U CN209400418 U CN 209400418U CN 201821720231 U CN201821720231 U CN 201821720231U CN 209400418 U CN209400418 U CN 209400418U
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- refractive index
- optical resin
- measuring device
- resin prism
- reflecting surface
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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
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model relates to a kind of measuring device for liquid refractive indexes, comprising: to generate the light source of light beam, the optical resin prism to reflect incident beam and the imaging sensor to receive outgoing beam image；The optical resin prism includes the plane of incidence that incident beam can be made to enter, the first reflecting surface, the first surface contacted with quantity of fluid to be measured, second surface, the second reflecting surface and light beam can be made to focus the outgoing plane for projecting and forming outgoing beam；First reflecting surface, the second reflecting surface are capable of reflecting light beam；The first surface contacted with quantity of fluid to be measured, second surface can projecting beam when in testing liquid contain bubble when, using between bubble liquid participate in measurement.Influence of the bubble to measuring refractive indexes of liquid in testing liquid is reduced as a result,.Meanwhile promoting 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 as illustrated in the drawing.In the shaded-image, bright part is corresponding in quilt
Survey the light that the interface of solution X and prism U3 is totally reflected, the corresponding light not being totally reflected in dark part, light and shade boundary
The line then corresponding critical angle being totally reflected.Since the variations in refractive index of detected solution will lead to the change of the generation cirtical angle of total reflection
Change, 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 the folding of fluid to be measured
Penetrate rate.
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 of light beam, the optical resin prism to reflect incident beam, to receive outgoing beam figure
The line scan image sensor of picture and the refractive index computing module to calculate liquid refractivity to be measured；
The optical resin prism includes the plane of incidence that incident beam can be made to enter, the first reflecting surface and liquid to be measured
The first surface of body contact, second surface, the second reflecting surface and light beam can be made to focus to project and form the outgoing plane of outgoing beam；
First reflecting surface, the second reflecting surface are capable of reflecting light beam；The first surface contacted with quantity of fluid to be measured, second surface
It being capable of projecting beam；
The incident beam that the light source issues enters the plane of incidence of the optical resin prism；
The incident beam is propagated in the optical resin prism and is reflected on first reflecting surface, forms first
The reflected beams, and the first surface for reaching and contacting with quantity of fluid to be measured is propagated in the optical resin prism, it transmits；
The light beam of transmission passes through testing liquid, and reflects, and reaches the second surface contacted with quantity of fluid to be measured again
It reflects, into optical resin prism, reaches the second reflecting surface, reflect, form the second the reflected beams；
Second the reflected beams are propagated in the optical resin prism, reach the outgoing plane；
The outgoing plane is focused second the reflected beams, forms outgoing beam.
Collimating lens are set between the light source and optical resin prism；
The light beam that the light source issues forms collimated light beam after the collimation lens, into the optical resin prism
The plane of incidence.
The collimation lens is made of 2 optical surfaces of aspherical mirror and Bao Weier prism.
The first surface and central symmetry of the second surface relative to the optical resin prism.
First reflecting surface and central symmetry of second reflecting surface relative to the optical resin prism.
First reflecting surface and second reflecting surface use optical coating.
The refractive index of the optical resin prism is between 1.50-1.75；
The plane of incidence is cylindrical mirror/toric lens；
The outgoing plane is aspherical mirror/toric lens.
Beneficial effect using the above scheme is:
The measuring device for liquid refractive index of the utility model embodiment, it is close in bubble by realizing transmission-type measurement method
In the case of collection, measurement is participated in using the solution to be measured between bubble, to reach the influence for avoiding bubble to measurement.Meanwhile it realizing
The miniaturization of 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. 7~10 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.
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 plane of incidence S1, the first reflecting surface S2, the first surface contacted with quantity of fluid to be measured
S3, second surface S4, the second reflecting surface S5 and outgoing plane S6, the light beam that the light source issues after collimation lens combing,
Collimated light beam is formed, into the plane of incidence S1 of the optical resin prism, the incident beam is in the optical resin prism
It propagates and is reflected on the first reflecting surface S2, form the first the reflected beams, and travel in the optical resin prism
Up to the first surface S3 contacted with quantity of fluid to be measured, transmit.The light beam of transmission passes through testing liquid, and reflects；It arrives
It is reflected again up to the second surface S4 contacted with quantity of fluid to be measured, into optical resin prism, reaches the second reflecting surface S5,
It reflects, forms the second the reflected beams.Second the reflected beams are propagated in the optical resin prism, reach the outgoing plane
S6, the outgoing plane are focused second the reflected beams, form outgoing beam.
Imaging sensor U4, preferably line scan image sensor, for acquiring the outgoing beam projected through outgoing plane S6
Image；
Refractive index computing device (not shown), it is to be measured for being calculated according to the corresponding relationship of outgoing beam image and refractive index
The refractive index of liquid.
The measuring device for liquid refractive index of the utility model embodiment, it is close in bubble by realizing transmission-type measurement method
In the case of collection, measurement is participated in using the solution to be measured between bubble, to reach the influence for avoiding bubble to measurement.Meanwhile it realizing
The miniaturization of device.
Preferably, the light source is laser light source.
Preferably, the first surface S3 and center pair of the second surface S4 relative to the optical resin prism
Claim.
Preferably, the first reflecting surface S2 and center of the second reflecting surface S5 relative to the optical resin prism
Symmetrically.
Preferably, the first reflecting surface S2 and the second reflecting surface S5 are coated with reflectance coating, which is preferably height
Inverse medium film or high anti-aluminium film, to enhance reflecting effect.
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 the collimation lens 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 is further, including plane of incidence S1 and outgoing plane S6.Plane of incidence S1 is used to convert a bunch for incident light
Shape collimated light beam；Second the reflected beams for being focused by outgoing plane S6, so that the second the reflected beams reach linear array figure
As sensor receiving plane when, form approximate point shaped laser spot.
Further, plane of incidence S1 is cylindrical mirror/toric lens.
Further, outgoing plane S6 is aspherical mirror/toric lens.
Preferably, plane of incidence S1 and outgoing plane S6 and the optical resin prism are integrally formed, it is highly preferred that being using light
Classes and grades in school transparent resin material；Using Shooting Technique integrated molding, to ensure the assembly consistency of optical component.
As shown in figure 5, forming a band diffusion angle after the collimated lens U2 combing of light beam that laser light source U1 is issued
Linear beam DD forms a branch of linear parallel light beam DE after the light beam reaches the S1 plane of incidence S1 of optical resin prism U3, should
Length 5-8mm, the width 1-2mm of light beam.Light beam DE is propagated in optical resin prism, and reaches the first reflecting surface S2, is occurred
Reflection；The first surface S3 contacted with solution to be measured is reached, and projects optical resin prism U3, into testing liquid.Due to
The refractive index for surveying liquid is different from the refractive index of optical resin prism U3, and light beam DE is reflected.According to law of refraction n1sin θ 1
=n2sin θ 2, when the refractive index of testing liquid is lower, light beam DE forms light beam L by refraction；When the refractive index of testing liquid
When for median, light beam DE forms light beam M by refraction；When the refractive index of testing liquid is higher, light beam DE passes through refraction shape
At light beam H；Light beam after refraction remains as a branch of linear parallel light beam, and again by the second surface of optical resin prism U3
S4 enters optical resin prism U3.Light beam L/M/H reaches the injection of optical resin prism U3 after the reflection of the second reflecting surface
Face.Light beam L/M/H is respectively formed focus on light beam L '/M '/H ' after outgoing plane focuses, and reaches connecing for line scan image sensor U4
Surface is received, the different location on the surface forms approximate point shaped laser spot.
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 testing liquid of different refractivity, image of focus on light beam L '/the M '/H ' in line scan image sensor.
Fig. 7 is the reception image for measuring the line scan image sensor U4 that refractive index is 1.3330 (deionized waters).
Fig. 8 is the reception image for measuring the line scan image sensor U4 that refractive index is 1.4250 liquid.
Fig. 9 is the reception image for measuring the line scan image sensor U4 that refractive index is 1.5400 liquid.
As shown in fig. 6, bubble can interfere with the light beam L/M/H for injecting testing liquid if there is bubble in testing liquid, it is
Some light deflect.But not it influences the liquid between bubble and participates in measurement, also have segment beam along original
Propagated, and arrive at line scan image sensor.Approximate point shaped laser spot is formed, there is no becoming for the position of the approximation point shaped laser spot
Change, the brightness for only putting shaped laser spot can reduce, as shown in Figure 10.At this moment, it can automatically adjust laser light source U1's by software
Brightness, to achieve the effect that measurement.
In conclusion in each embodiment of the utility model, by realizing transmission-type measurement method, in the intensive situation of bubble
Under, measurement is participated in using the solution to be measured between bubble, to reach the influence for avoiding bubble to measurement.Meanwhile realization device
Miniaturization.
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, the optical resin prism to reflect incident beam and to receive outgoing beam image
Imaging sensor；
The optical resin prism includes the plane of incidence that incident beam can be made to enter, the first reflecting surface, connects with quantity of fluid to be measured
The first surface of touching, second surface, the second reflecting surface and light beam can be made to focus the outgoing plane for projecting and forming outgoing beam；It is described
First reflecting surface, the second reflecting surface are capable of reflecting light beam；The first surface contacted with quantity of fluid to be measured, second surface can
Projecting beam；
The incident beam that the light source issues enters the plane of incidence of the optical resin prism；
The incident beam is propagated in the optical resin prism and is reflected on first reflecting surface, and the first reflection is formed
Light beam, and the first surface for reaching and contacting with quantity of fluid to be measured is propagated in the optical resin prism, it transmits；
The light beam of transmission passes through testing liquid, and reflects, and reaches the second surface contacted with quantity of fluid to be measured and occurs again
Refraction reaches the second reflecting surface, reflects into optical resin prism, forms the second the reflected beams；
Second the reflected beams are propagated in the optical resin prism, reach the outgoing plane；
The outgoing plane is focused second the reflected beams, forms outgoing beam.
2. measuring device for liquid refractive index according to claim 1, which is characterized in that the light source and optical resin prism
Between collimating lens are set；
The light beam that the light source issues forms collimated light beam after the collimation lens, into the incidence of the optical resin prism
Face.
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 described second
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 first reflecting surface and described the
Central symmetry of two reflectings surface relative to the optical resin prism.
6. measuring device for liquid refractive index according to claim 1, which is characterized in that first reflecting surface and described
Two reflectings surface use optical coating.
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 cylindrical mirror/multiple
Toroidal lens.
9. measuring device for liquid refractive index according to claim 1, which is characterized in that the outgoing plane be aspherical mirror/
Toric lens.
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 |
|---|---|---|---|
| CN201821720231.XU CN209400418U (en) | 2018-10-23 | 2018-10-23 | A kind of measuring device for liquid refractive index |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821720231.XU CN209400418U (en) | 2018-10-23 | 2018-10-23 | A kind of measuring device for liquid refractive index |
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| Publication Number | Publication Date |
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| CN209400418U true CN209400418U (en) | 2019-09-17 |
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| CN201821720231.XU Active CN209400418U (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 |
|---|---|---|---|---|
| CN109187432A (en) * | 2018-10-23 | 2019-01-11 | 北京博芮思商贸有限公司 | A kind of measuring device for liquid refractive index and measurement method |
-
2018
- 2018-10-23 CN CN201821720231.XU patent/CN209400418U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187432A (en) * | 2018-10-23 | 2019-01-11 | 北京博芮思商贸有限公司 | A kind of measuring device for liquid refractive index and measurement method |
| CN109187432B (en) * | 2018-10-23 | 2023-09-12 | 北京领航力嘉机电有限公司 | Liquid refractive index measuring device and measuring method |
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