CN105571822A - Calibrating device of two-dimensional color analyzer and calibration method - Google Patents
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- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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Abstract
The invention brings forward a calibrating device of a two-dimensional color analyzer. The calibrating device comprises a main integrating sphere, a light outlet, a cascade auxiliary integrating sphere, an integrating sphere inner wall coating layer, a light-blocking plate, a high-power standard light source, a color filter combination, an adjustable aperture diaphragm, and an optical fiber frequency spectrograph, incident light is provided for the main integrating sphere by employing the cascade auxiliary integrating sphere, a group of color filters for providing output of the light source with different colors and the uniform surface are arranged between the main integrating sphere and the cascade auxiliary integrating sphere, the adjustable aperture diaphragm performs large-range control of the luminous flux irradiated to the main integrating sphere, the light-blocking plate is arranged between the light outlet of the main integrating sphere and the adjustable aperture diaphragm, the emitted light is emitted after at least one time of reflection, a sidewall of the main integrating sphere is provided with a monitoring window, the output brightness level and spectrum distribution of the light source are measured via a luminosity probe and the optical fiber frequency spectrograph, and reference values are provided for the calibration. The calibrating device is advantaged by concise structure, complete functions, and convenient operation.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a calibration device and a calibration method for a two-dimensional color analyzer.
Background
At present, new light emitting devices such as LED/OLED have been widely used in the fields of street lamp lighting, Flat Panel Display (FPD), vehicle display, and cabin lighting, and related manufacturing enterprises are focusing on the application of new technologies to meet the needs of market applications. For example, display technology has evolved from conventional CRT to LCD, PDP and OLED, which requires that the instrumentation system be capable of efficient testing, both in the development and production stages, to provide greater throughput and accuracy. The structural characteristics and the performance of the two-dimensional color analyzer make the two-dimensional color analyzer play an increasingly important role in the technical field of testing of new displays.
At present, two-dimensional color analyzers are widely applied to display manufacturing enterprises, automobile manufacturing enterprises and communication product manufacturing enterprises, and provide uniformity of surface light sources, luminance and chrominance tests indicated by instruments in automobiles, and color and luminance analysis tests of lighting environments and mobile phone screens for products manufactured by the enterprises. Some instrument manufacturers in China also develop corresponding instrument equipment, and various measurement institutions and quality control centers gradually accept the calibration work of related instruments, but the two-dimensional color analyzer is not yet calibrated in China.
Different from the traditional aiming point type imaging brightness meter, the two-dimensional color analyzer utilizes an optical lens to image the image of the detected luminous body on the area array CCD through the optical filter group, thereby realizing that the brightness value and the chromatic value of different positions on the surface of the detected luminous body can be obtained by single scanning, and being a high-efficiency brightness and chromaticity measuring instrument.
At present, most of domestic calibration methods for two-dimensional color analyzers still conform to the 'JJG 211-2005 luminance meter calibration regulations', and the specific method is that a standard lamp for calibrating light intensity values is used, a diffuse reflection plate is moved on an optical guide rail, so that luminance reference values of the diffuse reflection plate at different positions are obtained, and the calibration of the luminance measurement values of the color analyzers is realized, and the specific method is shown in fig. 1. The chromaticity calibration method is to calibrate the chromaticity measured value of the instrument at a calibrated specific reference point by utilizing a series of transmission type standard color plates to be matched with a light intensity standard lamp, and the principle of the scheme is shown in figure 2. The measurement point of the conventional imaging luminance meter is related to the instrument field of view as shown in fig. 3.
The prior art solution is directed to a conventional aiming point type imaging luminance meter, which needs to aim at a standard white board (or a transmission-type standard color board) through an eyepiece of the instrument during measurement, and an output value given by the instrument is a measurement result for a measurement point aimed at in the eyepiece.
The calibration technique for a two-dimensional color analyzer developed according to the existing calibration protocol has the following disadvantages:
(1) the brightness and chromaticity uniformity of the two-dimensional color analyzer are important characteristic parameters, the existing calibration technology cannot carry out high-efficiency calibration work aiming at the parameters, and an conceivable implementation method is to realize that the measurement result provided by the standard white board is obtained at enough positions in the instrument field of view through the relative positions of a multi-measurement mobile instrument and the standard white board, obviously, the movement can cause influence on the measurement result of the uniformity, and the efficiency and the time consumption are low;
(2) when the existing calibration of different brightness values is carried out, the distance between the light intensity standard lamp and the standard diffuse reflection white board needs to be adjusted, the adjustment and measurement of the distance have certain requirements on the operation level of a calibrator, and relatively time is consumed;
(3) the traditional slit regulation method changes the luminance of the output port of the integrating sphere, and the luminance indication value can also be linearly influenced by the illumination probe due to the fact that the real-time width of the slit cannot be accurately measured during regulation, so that the accuracy and reproducibility of the luminance of the output port of the integrating sphere within the whole dynamic range are influenced.
Disclosure of Invention
Aiming at the defects, the invention innovatively uses a large-aperture high-uniformity surface light source, an integrating sphere output brightness adjusting system and a spectral radiance real-time monitoring system to carry out targeted calibration work on the two-dimensional color analyzer, can more appropriately meet the calibration requirement of the two-dimensional color analyzer, and solves the problems of poor adaptability, low efficiency, time consumption and the like in instrument calibration in the prior art.
The technical scheme of the invention is realized as follows:
a two-dimensional color analyzer calibration apparatus, comprising: the device comprises a main integrating sphere body, a light outlet, a cascade auxiliary integrating sphere, an integrating sphere inner wall coating, a light barrier, a high-power standard light source, a color filter combination, an adjustable aperture diaphragm and a fiber spectrometer; wherein,
providing incident light for the main integrating sphere in a manner of cascading auxiliary integrating spheres;
a group of color filters are arranged between the main integrating sphere and the cascade auxiliary integrating sphere to provide the output of uniform surface light sources with different colors;
the adjustable aperture diaphragm is used for carrying out large-range control on luminous flux incident to the main integrating sphere;
a light barrier is arranged between the light outlet of the sphere of the main integrating sphere and the aperture-adjustable diaphragm, and all emergent light is emitted after being reflected at least once;
a monitoring window is arranged on the side wall of the main integrating sphere, and the output brightness level and the spectral distribution of the light source are measured through a photometric probe and a fiber spectrometer, so that a reference value is provided for calibration.
Optionally, the diameter of the integrating sphere is not less than 1000 mm.
Optionally, the diameter of the light outlet is set to be more than 100mm, and the diameter of the light outlet is not higher than 1/3 of the diameter of the main integrating sphere.
Optionally, the inner wall coating of the integrating sphere uses a diffuse reflection material with high reflectivity.
Optionally, the high-power standard light source adopts a high-power halogen tungsten lamp to provide incident light for the integrating sphere.
Optionally, the high-power standard light source is not lower than 300W, and the color temperature of the light source is adjusted to be output at 2856K.
Optionally, the adjustable aperture stop is comprised of a micrometer caliper structure.
The invention also provides a calibration method of the two-dimensional color analyzer, which is based on the calibration device to calibrate the two-dimensional color analyzer, and when the two-dimensional color analyzer is calibrated, the focal length of the lens of the analyzer is adjusted, so that the light emitting surface of the light outlet of the main integrating sphere covers the whole view field of the analyzer, and the images observed in the view field of the analyzer are all on the light emitting surface of the light outlet of the integrating sphere;
by selecting appropriate measuring points on the luminous surface and using formulasObtaining the brightness uniformity of the instrument;
when the instrument brightness parameter measurement linearity is calibrated, the light flux input into the integrating sphere is accurately controlled by changing the aperture of the light-passing diaphragm of the auxiliary integrating sphere, so that the output brightness of the main integrating sphere is adjusted in a large range.
The invention has the beneficial effects that:
(1) the invention has the advantages of large dynamic range of brightness output, and capability of calibrating the brightness measurement linearity of the two-dimensional color analyzer;
(2) the invention can realize single measurement to calibrate the brightness and chroma uniformity of the two-dimensional color analyzer;
(3) compared with the prior art, the calibration device has the advantages of simple structure, complete function and convenient operation, reduces the operation of the relative movement position of the calibrated instrument and the calibration device, can reduce the adverse effect of personnel operation on the calibration result, and ensures the accuracy of the value of the calibration result of the two-dimensional color analyzer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a brightness calibration method for a color analyzer;
FIG. 2 is a schematic diagram of a method for calibrating chromaticity of a color analyzer;
FIG. 3 is a schematic view of the relationship between the measurement point and the instrument field of view of a conventional imaging luminance meter;
FIG. 4 is a schematic diagram of a large aperture integrating sphere light source according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the requirement of the brightness and chromaticity uniformity calibration of a two-dimensional color analyzer in China at present, the invention provides a calibration device of the two-dimensional color analyzer, which adopts a large-caliber uniform surface light source and a large dynamic brightness adjustable integrating sphere light source to realize the accurate calibration of parameters such as the brightness uniformity, the color uniformity, the brightness linearity and the like of the two-dimensional color analyzer, realizes the calibration of the brightness uniformity and the chromaticity uniformity of the two-dimensional color analyzer through the large-caliber uniform surface light source, and realizes the calibration of the brightness linearity of the two-dimensional color analyzer through the large dynamic precision adjustable brightness integrating sphere light source.
As shown in fig. 4, the technical solution adopted by the present invention is mainly realized by a large aperture integrating sphere light source, which mainly comprises the following structural components: the device comprises a main integrating sphere body, a light outlet, a high-reflectivity inner wall coating, a light barrier, a cascade auxiliary integrating sphere, a high-power standard light source, a color filter combination, an adjustable aperture diaphragm, a fiber spectrometer, a stable direct current power supply, an air cooling system, a radiating fin and the like.
The components of the calibration device of the present invention will be described in detail below with reference to the accompanying drawings.
Main integrating sphere: in order to ensure that the light source is reflected on the inner wall of the integrating sphere for multiple times and achieve an ideal uniform light effect, the diameter of the sphere of the integrating sphere is not less than 1000mm considering the size and uniformity of a light-emitting surface to be ensured for calibrating the two-dimensional color analyzer.
A light outlet: the final output part is used for calibrating the two-dimensional color analyzer, the diameter of the light outlet is set to be more than 100mm in order to realize the full-space coverage of the view field of the analyzer, and the diameter of the light outlet is not higher than 1/3 of the diameter of the main integrating sphere in order to ensure that the light emitting surface of the light outlet has nonuniformity of more than 1%.
High-reflectivity inner wall coating: in order to ensure the light-emitting efficiency of the integrating sphere and prevent the intensity of emergent light of a light source from being weakened after the emergent light is reflected for multiple times, a diffuse reflection material with high reflectivity is required to be used as the coating of the inner wall of the integrating sphere.
Light barrier: in order to prevent the light emitted from the light outlet from being uniformly processed after being reflected by the inner wall of the integrating sphere, a light barrier needs to be arranged between the light outlet and the adjustable aperture diaphragm, so that all the emergent light can be emitted after being reflected at least once.
A cascade auxiliary integrating sphere: the traditional integrating sphere design is that a light source is arranged on the inner wall of the integrating sphere or is tightly attached to the inner wall, and because the size of the integrating sphere is relatively large, a mode of cascading auxiliary integrating spheres is adopted to provide incident light for the main integrating sphere, so that a more ideal uniform light effect is ensured.
High-power standard light source: the invention adopts a high-power halogen tungsten lamp to provide incident light for the integrating sphere, in order to ensure that emergent light still has larger radiation energy after the light uniformizing action of the integrating sphere, the power of a light source is not lower than 300W, and the color temperature of the light source is adjusted to be 2856K for output, so that the spectral distribution meets the requirement of instrument calibration.
Color filter combination: in order to realize the calibration of chromaticity parameters of the two-dimensional color analyzer, a group of color filters are arranged between the main integrating sphere and the auxiliary integrating sphere, so that the output of uniform surface light sources with different colors can be provided, and the calibration of parameters such as the chromaticity uniformity of the analyzer is realized;
adjustable aperture diaphragm: in order to realize the brightness linearity calibration of the two-dimensional color analyzer, the adjustable aperture diaphragm is arranged in the invention, so that the light flux incident to the main integrating sphere can be controlled in a large range, and the requirement of high dynamic range of the brightness calibration range of the device is met.
And (3) fiber optic spectrometer: in order to realize real-time monitoring of the output brightness of the integrating sphere, a monitoring window needs to be arranged on the side wall of the main integrating sphere, the measurement of the output brightness level and the spectral distribution of a light source is realized through a photometric probe and an optical fiber spectrometer, and a reference value is provided for instrument calibration.
Stabilizing a direct-current power supply: the invention provides calibration for a two-dimensional color analyzer, the standard light source has excellent stable output, and the stable direct current power supply can provide stable power supply current for the standard light source to ensure the stability of output.
Air cooling system and fin: because the standard light source power is set to be larger and the heat effect of the halogen tungsten lamp is obvious, a corresponding heat dissipation system is required to be arranged.
When the two-dimensional color analyzer is calibrated, the focal length of the lens of the instrument is adjusted, so that the light emitting surface of the light outlet of the integrating sphere covers the whole view field of the instrument, namely, the images observed in the view field of the instrument are all on the light emitting surface of the light outlet of the integrating sphere. By selecting appropriate measuring points on the luminous surface and using formulasCan obtainTo the brightness uniformity of the instrument.
When the linearity of the measurement of the brightness parameters of the instrument is calibrated, the aperture of the light-passing diaphragm of the auxiliary integrating sphere is changed to realize the accurate control of the luminous flux input into the integrating sphere, thereby realizing the large-range adjustment of the output brightness of the main integrating sphere and realizing the adjustable aperture diaphragm with the control function, which is composed of a micrometer screw structure.
The invention generates a uniform luminous surface with the caliber of more than 100mm and the nonuniformity of more than 1 percent by integrating sphere cascade and uniform distribution technology, and can ensure the calibration of the brightness and chromaticity uniformity of the two-dimensional color analyzer in the full-view field range; and the brightness of the integrating sphere is accurately measured through the refrigeration type detector, the power supply of the light source is fed back and controlled to ensure the stability in the brightness adjusting process, the spectrum curve of the integrating sphere light source is monitored through the refrigeration type spectrometer, and the chromaticity value output by the light source is accurately calculated through the measured spectrum radiance value.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A two-dimensional color analyzer calibration device, comprising: the device comprises a main integrating sphere body, a light outlet, a cascade auxiliary integrating sphere, an integrating sphere inner wall coating, a light barrier, a high-power standard light source, a color filter combination, an adjustable aperture diaphragm and a fiber spectrometer; wherein,
providing incident light for the main integrating sphere in a manner of cascading auxiliary integrating spheres;
a color filter combination is arranged between the main integrating sphere and the cascade auxiliary integrating sphere to provide the output of uniform surface light sources with different colors;
the adjustable aperture diaphragm is used for carrying out large-range control on luminous flux incident to the main integrating sphere;
a light barrier is arranged between the light outlet of the sphere of the main integrating sphere and the aperture-adjustable diaphragm, and all emergent light is emitted after being reflected at least once;
a monitoring window is arranged on the side wall of the main integrating sphere, and the output brightness level and the spectral distribution of the light source are measured through a photometric probe and a fiber spectrometer, so that a reference value is provided for calibration.
2. The two-dimensional color analyzer calibration device according to claim 1, wherein the integrating sphere has a diameter of not less than 1000 mm.
3. The two-dimensional color analyzer calibration device according to claim 1, wherein the light exit diameter is set to 100mm or more and is not higher than 1/3 of the diameter of the main integrating sphere.
4. The two-dimensional color analyzer calibration device according to claim 1, wherein the inner wall coating of the integrating sphere uses a diffuse reflective material having a high reflectivity.
5. The two-dimensional color analyzer calibration device according to claim 1, wherein the high power standard light source employs a high power tungsten halogen lamp to provide incident light for the integrating sphere.
6. The two-dimensional color analyzer calibration device according to claim 5, wherein the high power standard light source is not lower than 300W and the color temperature of the light source is adjusted to output 2856K.
7. The two-dimensional color analyzer calibration device according to claim 1, wherein the adjustable aperture stop is comprised of a micrometer screw structure.
8. A two-dimensional color analyzer calibration method, which is performed based on the calibration apparatus according to any one of claims 1 to 7,
when the two-dimensional color analyzer is calibrated, the focal length of an instrument lens is adjusted, so that the light emitting surface of the light outlet of the main integrating sphere covers the whole view field of the instrument, and the images observed in the view field of the instrument are all on the light emitting surface of the light outlet of the integrating sphere;
by selecting appropriate measuring points on the luminous surface and using formulasObtaining the brightness uniformity of the instrument;
when the instrument brightness parameter measurement linearity is calibrated, the light flux input into the integrating sphere is accurately controlled by changing the aperture of the light-passing diaphragm of the auxiliary integrating sphere, so that the output brightness of the main integrating sphere is adjusted in a large range.
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| CN106872372A (en) * | 2017-03-17 | 2017-06-20 | 广西电网有限责任公司电力科学研究院 | A kind of constant-temperature integrating sphere device for gas analysis |
| CN108709101A (en) * | 2018-04-11 | 2018-10-26 | 苏州艾力光电科技有限公司 | A kind of light source distance adjusting apparatus |
| CN110186558A (en) * | 2019-05-16 | 2019-08-30 | 中国科学院合肥物质科学研究院 | The gold-plated integrating sphere light source of vacuum infrared |
| CN111060204A (en) * | 2019-12-30 | 2020-04-24 | 昆山钧沃光电有限公司 | Calibration device and method for color analyzer |
| CN111879404A (en) * | 2020-06-22 | 2020-11-03 | 天津凯迪歆航照明显示设备科技有限公司 | Light source parameter optimization method |
| CN112032589A (en) * | 2020-09-15 | 2020-12-04 | 苏州市计量测试院 | Integrating sphere standard light source |
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| CN106872372B (en) * | 2017-03-17 | 2023-11-17 | 广西电网有限责任公司电力科学研究院 | Constant temperature integrating sphere device for gas analysis |
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| CN108709101A (en) * | 2018-04-11 | 2018-10-26 | 苏州艾力光电科技有限公司 | A kind of light source distance adjusting apparatus |
| CN110186558A (en) * | 2019-05-16 | 2019-08-30 | 中国科学院合肥物质科学研究院 | The gold-plated integrating sphere light source of vacuum infrared |
| CN111060204A (en) * | 2019-12-30 | 2020-04-24 | 昆山钧沃光电有限公司 | Calibration device and method for color analyzer |
| CN111879404A (en) * | 2020-06-22 | 2020-11-03 | 天津凯迪歆航照明显示设备科技有限公司 | Light source parameter optimization method |
| CN113916252A (en) * | 2020-07-07 | 2022-01-11 | 北京振兴计量测试研究所 | Adjustable ultra-weak standard photon source |
| CN113916252B (en) * | 2020-07-07 | 2024-01-05 | 北京振兴计量测试研究所 | Adjustable ultra-weak standard photon source |
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| CN113932931A (en) * | 2021-08-25 | 2022-01-14 | 广东省计量科学研究院（华南国家计量测试中心） | Symmetric color temperature calibration device and color temperature meter calibration method |
| CN114061768B (en) * | 2021-08-25 | 2024-02-02 | 广东省计量科学研究院（华南国家计量测试中心） | Integrating sphere type light source color temperature calibration device and color temperature meter calibration method |
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