CN111504464A - Time division multiplexing double-beam photometric device - Google Patents
Time division multiplexing double-beam photometric device Download PDFInfo
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- CN111504464A CN111504464A CN202010515601.1A CN202010515601A CN111504464A CN 111504464 A CN111504464 A CN 111504464A CN 202010515601 A CN202010515601 A CN 202010515601A CN 111504464 A CN111504464 A CN 111504464A
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- integrating sphere
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- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 238000000889 atomisation Methods 0.000 claims abstract description 3
- 230000031700 light absorption Effects 0.000 claims description 10
- 238000005375 photometry Methods 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 21
- 230000003287 optical effect Effects 0.000 description 27
- 238000010586 diagram Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 238000000985 reflectance spectrum Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0251—Colorimeters making use of an integrating sphere
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a time division multiplexing double-beam photometric device, which comprises an integrating sphere, an electric control light modulator, a coupling light path and a detector, wherein the integrating sphere is connected with the electric control light modulator through the coupling light path; the integrating sphere is provided with a light source, a tested window and an exit window, and the exit window and the tested window are respectively positioned on the spherical surfaces above and below the integrating sphere; the coupling light path is arranged above the emergent window; the detector is arranged above the coupling light path; the tested window, the emergent window, the coupling light path and the detector are sequentially arranged in a straight line; the electric control light modulator can realize the switching between the transparent state and the atomization state in an electric control mode. The time division multiplexing double-beam photometer provided by the invention can realize the function of sequentially testing the tested window and the integrating sphere wall by the same light source without forming a gap on the integrating sphere wall, and only one light path is needed.
Description
Technical Field
The invention relates to the field of measurement of reflection spectrum, in particular to a time division multiplexing double-beam photometric device.
Background
A photometry device for calculating the color parameters of an object by detecting the reflection spectrum of the surface of the object basically adopts a spectrometer as a light splitting component, and the photometry device can be divided into a single beam and a double beam according to a photometric method.
The single-beam photometric device has only one optical path, measures the test sample and the reference light at each wavelength, compares the test results, and calculates the reflection spectrum of the sample. A disadvantage of single beam photometric devices is that it must be ensured that the entire device remains stable during the entire test time for measuring the test sample and the reference light. Even if the light source is sufficiently preheated for a long time, the spectral power of the light source changes, the electrical drift of each measurement cannot be effectively calibrated, and particularly, the influence on the repeatability precision and reproducibility of the photometry device is particularly large, so that the single-beam photometry device has the defect that the measurement data is unstable.
In the prior art, a dual-beam photometer has two optical paths, namely, an optical path for a test sample (hereinafter referred to as a "test optical path") and an optical path for a test reference light (hereinafter referred to as a "reference optical path"), after an illumination light source is turned on, two beams of light enter the test optical path and the reference optical path respectively, the test optical path and the reference optical path are measured simultaneously, and measurement results are compared to calculate a reflectance spectrum of the test sample. The double-beam photometric device completes measurement within a short lighting time of the illumination light source, has the advantages of rapid measurement and stable data, but has the defects of complex assembly, high cost and difficult miniaturization caused by an incompact structure. Specifically, referring to fig. 1, a dual-beam photometry device in the related art includes an integrating sphere 200, a light source 2001, a measured object window 2002, a measured object exit light window 202, a sphere wall exit window 203, and spectrometers 204 and 205. The operating principle of the dual-beam photometric device is that when the light source 1001 emits light at the same time, the chromaticity value of the light reflected by the window 2002 of the measured object and the energy value of the light reflected by the spherical wall of the integrating sphere are collected at the same time.
In addition, patent number Z L201621159676.6, the utility model patent of patent name "single light path beam split colorimeter" discloses a single light path beam split colorimeter of integrating sphere, integrating sphere inside has barn door and plectrum, wherein the barn door is stationary, the plectrum gets into or shifts out the integrating sphere through the gap on the integrating sphere, the barn door is used for blocking the direct incident of light that the light source sent to the measured object surface.
Therefore, the prior art is in need of improvement.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a time division multiplexing double-beam photometric device, which has the following specific scheme:
the device comprises an integrating sphere, an electric control light modulator, a coupling light path and a detector; the integrating sphere is provided with a light source, a tested window and an exit window, and the exit window and the tested window are respectively positioned on the spherical surfaces above and below the integrating sphere;
the coupling light path is arranged above the emergent window;
the detector is arranged above the coupling light path;
the tested window, the emergent window, the coupling light path and the detector are sequentially arranged in a straight line;
the electric control light modulator can realize the switching between a transparent state and an atomization state in an electric control mode; when the electric control light modulator is transparent, the reflection of the detected window is converged to the detector entrance port through the coupling light path; when the electric control light modulator atomizes, the reflected light blocking the window of the measured object is converged to the entrance port of the detector and is uniformly irradiated by each point on the inner wall of the integrating sphere.
Preferably, the integrating sphere is further provided with a light absorption trap, the exit window is located on one side of the normal of the measured window, the light absorption trap is located on the other side of the normal of the measured window, and the size of the light exit angle formed by the exit window and the normal of the measured window is equal to the size of the light incident angle formed by the absorption trap and the normal of the measured object window.
Preferably, when the electrically controlled light modulator is in a transparent state, the higher the transmittance of the electrically controlled light modulator is, the better the transmittance is, and the spectral range transmitted by the electrically controlled light modulator is 400nm to 700 nm.
Preferably, when the electrically controlled light modulator is in the atomizing state, the scattered light of the exit surface of the electrically controlled light modulator is in lambertian scattering or near lambertian scattering.
Preferably, a baffle is further arranged in the integrating sphere and used for preventing the light emitted by the light source from directly irradiating the measured object.
The time division multiplexing double-beam photometric device provided by the invention has the following beneficial effects:
1. through the arrangement of the electric control light modulator, the same light source can sequentially emit light in two switching states of the electric control light modulator without forming a gap on the wall of the integrating sphere to test the functions of a tested window and the wall of the integrating sphere, the structure is simple, the assembly is convenient, the integrating sphere is close to the basic condition of an ideal integrating sphere, only one light path is needed, the cost is saved, and the test effect is ensured;
2. the electric control light modulator is adopted, so that the transparent state and the atomizing state can be switched without adding other mechanical components, and the structure is simple and reliable;
3. in the preferred scheme, the arrangement of the light absorption trap further ensures the test effect;
4. in the preferred scheme, the setting of baffle has further guaranteed test effect.
Drawings
Fig. 1 is a schematic diagram of the operation principle of a dual-beam photometric device in the prior art;
FIG. 2 is a schematic diagram of a schematic three-dimensional structure of an electrically controlled light modulator in a transparent state according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a schematic three-dimensional structure of an electrically controlled light modulator in an atomized state according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the operation of an electrically controlled optical modulator in a transparent state according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the operation of an electrically controlled optical modulator in a transparent state according to an embodiment of the present invention;
FIG. 6 is a schematic view of the position of the light absorbing trap;
FIG. 7 is a schematic diagram of the operation principle of the electrically controlled light modulator in a transparent state;
fig. 8 is a schematic diagram of the operating principle of the electrically controlled light modulator in the atomizing state.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
Referring to fig. 2 to 5, the invention provides a time division multiplexing dual-beam photometry device, which includes an integrating sphere 100, an electrically controlled light modulator 101, a coupling light path 102, and a detector 103.
The integrating sphere is provided with a light source 1001, a measured window 1003 and an exit window 1004, the exit window 1004 and the measured window 1003 are respectively positioned on the spherical surface above and below the integrating sphere 100, and specifically, the measured window 1003 and the exit window 1004 are positioned on the same cross-sectional circle passing through the center of the sphere of the integrating sphere; the coupling optical path 102 is arranged above the exit window 1003, the detector 103 is arranged above the coupling optical path 102, and the window 1003 to be measured, the exit window 1004, the coupling optical path 102 and the detector 103 are sequentially arranged in a straight line. A baffle 1002 is further disposed below the light source 1001 for preventing the light emitted from the light source 1001 from directly irradiating the object to be measured.
Specifically, the electrically controlled light modulator 101 is a Polymer Dispersed liquid crystal film (Polymer Dispersed L required crystalline film), also called PD L C, having a structure as shown in FIGS. 7 and 8, wherein a conductive film of Indium Tin Oxide (ITO)2a is used as a carrier, a functional film is covered with a high temperature resistant polyester film (PET)1a, and a composite material of liquid crystal droplets 4a uniformly Dispersed in a single Polymer 3a is used as a material, and the composite material can show two states of transparency and scattering under the switching action of an electric field, when an electric field is applied to the electrically controlled light modulator 103, the liquid crystal droplets 4a are aligned with each other due to the optical axis of the liquid crystal droplets 4a being aligned with the refractive index of the matrix, and the light is transmitted through the electrically controlled light modulator 103, when the electric field is removed, the liquid crystal droplets 4a are aligned with the optical axis of the liquid crystal droplets 4a being free, the refractive index of the liquid crystal is not matched with the refractive index of the matrix, when the light passes through the matrix, the electrically controlled light modulator 101 is switched to the two states of transparency and the electrically controlled light is reflected by the electrically controlled light modulator 101, when the optical path of the light is changed from the optically modulated by the electrically controlled light, the electrically controlled light detector 101, the electrically controlled light modulator 101, the electrically controlled light is switched to the optically opaque droplet is switched to the optically opaque state, the optically transmissive optical path, and the optically transmissive optical path of the optically transmissive optical window, the optically transmissive optical path of the optically transmissive droplet 4a, the optically transmissive optical modulator 103, the optically variable optical path of the optically variable optical window, and the optically variable optical path of the optically variable.
The coupling optical path 102 includes two coupling lenses (1021, 1022).
The integrating sphere 100 is further provided with a light absorption well 1005, the exit window 1004 is located on one side of the normal of the measured window 1003, and the light absorption well 1005 is located on the other side of the normal of the measured window 1003, wherein the light exit angle formed by the exit window 1004 and the normal of the measured window 1003 is equal to the light incident angle formed by the absorption well 1005 and the normal of the measured window 1003, and by absorption of the light absorption well 1005 on the light, the light at the light absorption well 1005 is prevented from generating mirror reflection on the measured window 1003, the light reflected by the mirror is prevented from entering a test light path, and elimination of mirror reflection components is realized. Specifically, referring to fig. 6, the central position of the measured window 1003 is set to be a, the normal line of the measured window 1003 is AD, the central position of the exit window 1004 is set to be B, the position of the light absorbing well 1005 is C, and the size of an included angle CAD between the connecting line AC and the AD is equal to the included angle BAD and is located on the same plane.
Under the condition that two states of the two light-beam photometry devices shown in the figures 4 and 5 are sequentially and rapidly switched, the light source 1001 continuously emits light twice in a short time to respectively test the window 1003 of the object to be tested and the electric control light modulator 101, and the function that the light source emits light once and simultaneously tests the window to be tested and the wall of the integrating sphere of the double-light-beam photometry device is realized.
The time division multiplexing double-beam photometric device provided by the invention has the following advantages:
1. through the arrangement of the electric control light modulator 101, the same light source can sequentially emit light in two switching states of the electric control light modulator 101 without forming a gap on the integrating sphere wall to realize the function of testing the tested window and the integrating sphere wall, the structure is simple, the assembly is convenient, the integrating sphere is close to the basic condition of an ideal integrating sphere, only one light path is needed, the cost is saved, and the testing effect is ensured;
2. the electric control light modulator 101 is adopted, so that the transparent state and the atomizing state can be switched without adding other mechanical components, and the structure is simple and reliable;
3. the arrangement of the light absorption trap further ensures the test effect.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A time division multiplexing double light beam photometry device is characterized in that: the device comprises an integrating sphere, an electric control light modulator, a coupling light path and a detector; the integrating sphere is provided with a light source, a tested window and an exit window, and the exit window and the tested window are respectively positioned on the spherical surfaces above and below the integrating sphere;
the coupling light path is arranged above the emergent window;
the detector is arranged above the coupling light path;
the tested window, the emergent window, the coupling light path and the detector are sequentially arranged in a straight line;
the electric control light modulator can realize the switching between a transparent state and an atomization state in an electric control mode; when the electric control light modulator is transparent, the reflection of the detected window is converged to the detector entrance port through the coupling light path; when the electric control light modulator atomizes, the reflected light of the window of the object to be detected is blocked from converging to the entrance port of the detector.
2. The apparatus of claim 1, wherein: the integrating sphere is further provided with a light absorption trap, the exit window is located on one side of the normal line of the window to be measured, the light absorption trap is located on the other side of the normal line of the window to be measured, and the size of a light exit angle formed by the exit window and the normal line of the window to be measured is equal to the size of a light incident angle formed by the absorption trap and the normal line of the window to be measured.
3. The apparatus of claim 1, wherein: when the electric control light modulator is in a transparent state, the spectrum range transmitted by the electric control light modulator is 400 nm-700 nm.
4. The apparatus of claim 1, wherein: when the electric control light modulator is in an atomizing state, scattered light of the emergent surface of the electric control light modulator is in Lambert scattering or near Lambert scattering.
5. The apparatus of claim 1, wherein: and a baffle plate is also arranged in the integrating sphere and used for preventing the light emitted by the light source from directly irradiating the measured object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010515601.1A CN111504464A (en) | 2020-06-05 | 2020-06-05 | Time division multiplexing double-beam photometric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010515601.1A CN111504464A (en) | 2020-06-05 | 2020-06-05 | Time division multiplexing double-beam photometric device |
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| Publication Number | Publication Date |
|---|---|
| CN111504464A true CN111504464A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010515601.1A Pending CN111504464A (en) | 2020-06-05 | 2020-06-05 | Time division multiplexing double-beam photometric device |
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| Country | Link |
|---|---|
| CN (1) | CN111504464A (en) |
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2020
- 2020-06-05 CN CN202010515601.1A patent/CN111504464A/en active Pending
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