CN109187432A - A kind of measuring device for liquid refractive index and measurement method - Google Patents
A kind of measuring device for liquid refractive index and measurement method Download PDFInfo
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- CN109187432A CN109187432A CN201811236956.6A CN201811236956A CN109187432A CN 109187432 A CN109187432 A CN 109187432A CN 201811236956 A CN201811236956 A CN 201811236956A CN 109187432 A CN109187432 A CN 109187432A
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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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Abstract
The present invention relates to a kind of measuring device for liquid refractive index and measurement methods, 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 present invention relates to a kind of field of measuring technique more particularly to a kind of measuring device for liquid refractive index and measurement methods.
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.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of measuring device for liquid refractive index and measurement methods, to solve
The certainly problem of measuring refractive indexes of liquid inaccuracy in the prior art.
According to an aspect of the invention, there is provided 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 exit facet 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.
According to another aspect of the present invention, a kind of method for measuring liquid refractive is provided, using liquid as described above
Body apparatus for measuring refractive index, comprising:
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 exit facet is focused second the reflected beams, forms outgoing beam；
Described image sensor acquires the image of the outgoing beam；
The refractive index computing module calculates to be measured according to collected outgoing beam image and the corresponding relationship of refractive index
The refractive index of liquid.
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 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 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 and method of the embodiment of the present invention, by realizing transmission-type measurement method, in bubble
In intensive situation, measurement is participated in using the solution to be measured between bubble, to reach the influence for avoiding bubble to measurement.Meanwhile it is real
The miniaturization of existing 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 embodiment of the present invention 1 provides；
Fig. 3 is the optical principle schematic diagram for the measuring device for liquid refractive index that the embodiment of the present invention 2 provides；
Fig. 4 is the optical principle schematic diagram for the measuring device for liquid refractive index that the embodiment of the present invention 3 provides；
Fig. 5 is the light path schematic diagram for the measuring device for liquid refractive index that the embodiment of the present invention 3 provides；
Fig. 6 is the solution bubble interference principle schematic diagram for the measuring device for liquid refractive index that the embodiment of the present invention 3 provides；
Fig. 7~10 are the ray-tracing simulations schematic diagram that the embodiment of the present invention 3 provides.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.It should be noted that in the absence of conflict, in embodiments herein and embodiment
Feature can be combined with each other.
Embodiment one
As shown in Fig. 2, the embodiment of the present invention 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 exit facet 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 embodiment of the present invention, by realizing transmission-type measurement method, in the intensive feelings of bubble
Under condition, 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.
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 embodiment of the present invention 2 provides a kind of measuring device for liquid refractive index, on the basis of embodiment 1
On, 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 embodiment of the present invention 3 provides a kind of measuring device for liquid refractive index, on the basis of embodiment 2
On, the present embodiment is further, including plane of incidence S1 and outgoing plane S6.Plane of incidence S1 is used to convert a branch of threadiness for incident light
Collimated light beam；Second the reflected beams for being focused by outgoing plane S6, so that the second the reflected beams reach linear array images
When the receiving plane of sensor, approximate point shaped laser spot is formed.
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, the light after the light beam reaches the S1 plane of incidence S1 of optical resin prism U3
Length 5-8mm, the width 1-2mm of beam.Light beam DE is propagated in optical resin prism, and reaches the first reflecting surface S2, is occurred anti-
It penetrates；The first surface S3 contacted with solution to be measured is reached, and projects optical resin prism U3, into testing liquid.Due to be measured
The refractive index of 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 is
When median, light beam DE forms light beam M by refraction；When the refractive index of testing liquid is higher, light beam DE is formed by refraction
Light beam H；Light beam after refraction remains as a branch of linear parallel light beam, and again by the second surface S4 of optical resin prism U3
Into optical resin prism U3.Light beam L/M/H reaches the exit facet of optical resin prism U3 after the reflection of the second reflecting surface
S5.Light beam L/M/H is respectively formed focus on light beam L '/M '/H ' after exit facet S5 focusing, reaches line scan image sensor U4's
Receiving surface, the different location on the surface form approximate point shaped laser spot.
Referring to Fig. 7-9, embodiment according to the present invention 3 is measured different using the present apparatus that ray tracking soft simulates
When the testing liquid of refractive index, 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.
Embodiment 4
According to above-mentioned each embodiment, the present embodiment 4 provides a kind of method for measuring liquid refractive, using above-mentioned each reality
The measuring device for liquid refractive index of example offer is provided, comprising:
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 exit facet is focused second the reflected beams, forms outgoing beam；
The line scan image sensor acquires the image of the outgoing beam；
The refractive index computing module calculates to be measured according to collected outgoing beam image and the corresponding relationship of refractive index
The refractive index of liquid.
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 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 plane of incidence is cylindrical mirror/toric lens；
The outgoing plane is aspherical mirror/toric lens.
In conclusion in each embodiment of the present invention, by realizing transmission-type measurement method, in the intensive situation of bubble,
Measurement is participated in using the solution to be measured between bubble, to reach the influence for avoiding bubble to measurement.Meanwhile realization device is small-sized
Change.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The shape for the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
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, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention 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 exit facet 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；
The plane of incidence is cylindrical mirror/toric lens；
The outgoing plane is aspherical mirror/toric lens.
8. a kind of method for measuring liquid refractive, using the measuring device for liquid refractive index as described in claim 1~7 is any,
It is characterised by comprising:
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 exit facet is focused second the reflected beams, forms outgoing beam；
Described image sensor acquires the image of the outgoing beam；
The refractive index computing module calculates testing liquid according to collected outgoing beam image and the corresponding relationship of refractive index
Refractive index.
9. method for measuring liquid refractive according to claim 8 characterized by comprising
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 incidence of the optical resin prism
Face.
10. method for measuring liquid refractive according to claim 8 characterized by comprising
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 plane of incidence is cylindrical mirror/toric lens；
The outgoing plane is aspherical mirror/toric lens.
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