CN103940587B - Quick measurement system for light source luminosity and chroma parameter angle distribution characteristics - Google Patents
Quick measurement system for light source luminosity and chroma parameter angle distribution characteristics Download PDFInfo
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- CN103940587B CN103940587B CN201310027271.1A CN201310027271A CN103940587B CN 103940587 B CN103940587 B CN 103940587B CN 201310027271 A CN201310027271 A CN 201310027271A CN 103940587 B CN103940587 B CN 103940587B
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Abstract
The invention discloses a quick measurement system for light source luminosity and chroma parameter angle distribution characteristics, which comprises a light source (1), a semi integral ball (2), a baffle (3), an aspherical mirror (4), a filter disc (5), a CCD camera (6) and a computer (7), wherein the semi integral ball (2) is composed of a hemispherical surface (21) and a bottom surface (22); the inner surface of the hemispherical surface is coated with a diffuse reflection layer (9); the inner surface of the bottom surface is coated with a high-absorption coating (10); a first round hole (23), the baffle (3), the aspherical mirror (4) and a temperature control system (8) are arranged on the bottom surface; a second round hole (24) is arranged on the hemispherical surface; and the filter disc is arranged between the CCD camera and the second round hole. Light beams emitted by the light source shine on the inner surface of the semi integral ball, the light beams are detected by the CCD camera via the filter disc after diffuse reflection and the aspherical mirror, signals are calculated via the computer and a correction module, and the light source luminosity and chroma parameter angle distribution characteristics are obtained.
Description
Technical field
The invention belongs to field of optical measuring technologies, more particularly to a kind of light source luminosity and the angular distribution characteristic of colorimetric parameter
Fast measurement system.
Background technology
The luminosity and the angular distribution characteristic of colorimetric parameter of measurement light source, in lighting source specificity analysises, computer vision, face
The application such as identification and material surface performance evaluation has great importance.Can be used to improve the secondary optical design of LED；
Optical property for various products such as LCD, outer surface of automobile, cinematographic films is checked；Further object scatter analysis, including
The measurement of BRDF (bidirectional reflectance distribution function) and BTDF (two-way transmission distribution function) etc., is capable of the various of comprehensive assessment material
Surface characteristic under illumination condition.
For the angular distribution feature measurement of luminosity and colorimetric parameter of luminous body, traditional method is by using various special
The measuring instrument and system of design is realizing.Distribution photometer (Goniophotometer) or angle spectrophotometer
(Gonio-spectroradiometer) rotate light source (LED, light fixture etc.) by twin shaft goniometer to measure special angle
Under luminosity or colorimetric parameter.The angular distribution characteristic of luminosity and colorimetric parameter is obtained by traveling through various space angles.
These methods generally employ rotation twin shaft design due to the measurement of space angle distribution character, therefore cause time of measuring long
(often need a few minutes even more than 30 minutes), the shortcomings of angular resolution is low, system structure is complicated, measurement cost is high.And
These devices all can only the strong distribution character of light-metering, and the distribution of color characteristic of a direction can not be surveyed, and light intensity and wavelength
Relation.And these devices all do not account for impact of the temperature to measurement result, and in fact, the temperature of high power light source
Impact to measurement result can not be ignored.
The content of the invention
The present invention is in order to make up above-mentioned the deficiencies in the prior art, there is provided a kind of light source luminosity and the angular distribution spy of colorimetric parameter
The Fast measurement system of property.
To solve above-mentioned technical problem, the invention provides a kind of light source luminosity and the angular distribution characteristic of colorimetric parameter is quick
Measuring system, including：LED light source (1), semi-integral ball (2), the first circular hole (23), the second circular hole (24), baffle plate (3), aspheric surface
Reflecting mirror (4), optical filter disk (5), by opto-electronic conversion measurement CCD camera (6), based on being processed measurement result
Calculation machine and calibrating patterns (7), temperature control system (8), hygrosensor (801), single-chip microcomputer (802) and PTC refrigeration systems
(803), diffuse-reflectance layer (9), black coating (10).
First circular hole (23) is arranged at semi-integral ball inner bottom surface center, and the light beam of light source (1) transmitting passes through the first circular hole
(23) into semi-integral ball inner surface；Baffle plate (3) is arranged between the first circular hole (23) and non-spherical reflector (4), to keep off
The direct light that light source reflects to aspheric surface；Non-spherical reflector (4) is arranged on away from the radius of the centre of sphere 1/3～1/2 of semi-integral ball；
Semi-integral ball outer surface is provided with the second circular hole (24)；Optical filter disk (5) be arranged on CCD camera (6) and the second circular hole (24) it
Between；CCD camera (6) is arranged on the semi-integral ball top by the second circular hole (24)；Computer and calibration model (7) and CCD
Camera (6) connects；Temperature control system (8) is arranged on the semi-integral ball bottom surface, hygrosensor (801) and single-chip microcomputer
(802) connect, single-chip microcomputer (802) is connected with PTC refrigeration systems (803), PTC refrigeration systems (803) connect with semi-integral ball bottom surface
Connect；Diffuse-reflectance layer (9) is coated in the hemisphere face inner surface of the semi-integral ball；High-selenium corn black coating (10) is coated in semi-integral
The bottom surface inner surface of ball.
Further, the diameter dimension of the semi-integral ball (2) is 300～1500mm.
Further, the non-spherical reflector (4) is arranged at the radius of the centre of sphere 1/3～1/2 of semi-integral ball,
It is functionally similar to fish eye lens, for reflecting the light of semi-integral ball inner surface to the CCD camera.
Further, the shape of the non-spherical reflector (4) includes and is not limited to ellipsoid, parabola, hyperboloid
And free form surface.Plated surface reflection coefficient is more than 92% high reflection thin film, its thin-film material include and be not limited to golden film,
Silverskin, aluminium film, the deielectric-coating of high low-refraction composition.
Further, the interferometric filter of 3～12 pieces of different wave lengths, its printing opacity ripple are provided with the optical filter disk (5)
Length is respectively 435.8nm, 450nm, 500nm, 546.1nm, 590nm, 620nm, 700nm, and the light source for visible light wave range is empty
Between luminosity and colorimetric parameter angular distribution feature measurement.
Further, the temperature control system includes：Hygrosensor (801), single-chip microcomputer (802) and PTC refrigeration system
System (803).Hygrosensor is connected with single-chip microcomputer, and single-chip microcomputer controls the semi-integral ball internal work by PTC refrigeration systems
Ambient temperature.
Further, the diffuse-reflectance layer (9) is by the barium sulfate or magnesium oxide that diffuse-reflectance coefficient is 5%～10% or poly-
Coating coating based on tetrafluoroethene or three kinds of material common combinations is formed.
Further, the high-selenium corn black coating (10) is by the black matt coating that absorptance is 96%～99%
Coating is formed.
A kind of light source luminosity and the Fast measurement system of the angular distribution characteristic of colorimetric parameter that the present invention is provided, using high-resolution
Rate CCD camera carries out imaging measurement, and optical filter disk is added before CCD camera, at the same arrange temperature control system, computer and
Calibrating patterns, not only system structure is simple, low cost, time of measuring are short, and with angular resolution is high, high precision and measurement
The advantages of data are accurate.
Description of the drawings
A kind of light source luminosity and the entirety of the Fast measurement system of colorimetric parameter angular distribution characteristic that Fig. 1 present invention is provided
Structural representation.
In a kind of light source luminosity of Fig. 2 present invention offers and the Fast measurement system of colorimetric parameter angular distribution characteristic automatically
The structural representation of temperature control system.
The quick measurement of a kind of Fig. 3 LED light source luminosity provided in an embodiment of the present invention and colorimetric parameter angular distribution characteristic
The structural representation of systematic survey.
A kind of Fig. 4 Fast measurement systems of LED light source light intensity angular distribution characteristic provided in an embodiment of the present invention it is several
Scattergram before what deformation calibration.
A kind of Fig. 5 Fast measurement systems of LED light source light intensity angular distribution characteristic provided in an embodiment of the present invention it is several
Comparison diagram after what deformation calibration.
A kind of Fig. 6 of the Fast measurement system of LED light source light intensity angular distribution characteristic provided in an embodiment of the present invention
The angular distribution result figure of light intensity in noon face.
A kind of Fig. 7 of the Fast measurement system of LED light source chromaticity coordinates angular distribution characteristic provided in an embodiment of the present invention
Color coordinates distribution result figure in noon face.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment that the present invention is provided is described in further detail.
Referring to accompanying drawing 3, in the present embodiment, semi-integral ball (2) its diameter dimension is 1000mm；Non-spherical reflector (4) sets
Put from the position of the radius of semi-integral ball (2) centre of sphere 1/2, its plated surface reflection coefficient is 93% high reflecting metal aluminium film；
There are four optical filtering film perforations on optical filter disk (5), wherein what optical filter is 1 do not let alone, 3 placed 3 pieces of differences through wavelength
Interferometric filter, it is respectively 435.8nm, 546.1nm and 700nm through wavelength；The resolution of CCD camera (6) be 512 ×
512 pixels, spectral response range covers 350～1100nm；It is 8% with sulphuric acid that diffuse-reflectance layer (9) is coated with diffuse-reflectance coefficient
Based on barium and mix the mixed coating of grey paint；High-selenium corn black coating (10) is coated with the black that absorptance is 98%
Delustred coating.
Below by being described in further detail to support this to the concrete operations principle and step in the present embodiment
The technical problem that a kind of light source luminosity of bright offer and the Fast measurement system of colorimetric parameter angular distribution characteristic can solve the problem that.
The Fast measurement system of light source luminosity and colorimetric parameter angular distribution characteristic in the present embodiment employs white light LEDs
Light source, for measuring the relevant parameter of photoptometry, colorimetry：
The first step：A diameter of 1000mm semi-integral ball (2) inner bottom planar central arrange the first circular hole (23), first
Circular hole (23) can be opened by lid or closed, for placing LED light source (1).By regulated power supply directly to LED light source
(1) it is powered, LED light source (1) sends the light of varying strength to all directions.
Second step：Due to the inner surface of semi-integral ball (2) scribble diffuse-reflectance coefficient be 8% based on barium sulfate and mix
Close the mixed coating of grey paint；, thus the light of all directions that LED light source sends can be in whole semi-integral ball (2) inner surface
Diffuse-reflectance is produced, because diffuse-reflectance coefficient is only 8%, therefore repeatedly diffuse-reflectance can be ignored.
3rd step：It is 93% by being placed on the plated surface that semi-integral ball (2) left side bottom surface is specially designed reflection coefficient
High reflection aluminum metal thin film non-spherical reflector (4), can diffuse and be reflected into what each point in semi-integral ball came
To CCD camera (6).
4th step：Simultaneously between LED light source (1) and non-spherical reflector (4), baffle plate (3) is provided with, its effect has two
Individual, one is the impact for blocking the direct light of LED light source (1) to non-spherical reflector (4), next to that itself is used as a diffuse-reflectance
Body take part in the reflection to light and absorption.
5th step：All light after non-spherical reflector (4) reflection all can be by the second circular hole (24) into CCD phases
Machine (6), before into CCD camera (6) can through an optical filter disk (5), have on the optical filter disk (5) 435.8nm,
3 differences of 546.1nm, 700nm pass through the optical filter of wavelength, for the light source space luminosity and colorimetric parameter of three primary colours wavelength
The measurement of angular distribution characteristic.When measuring the distribution function of the light that wavelength is 435.8nm, optical filter disk (5) need to be rotated to
Cross the optical filter that wavelength is 435.8nm.Continue rotating filtering piece disk to cause to be respectively 546.1nm, 700nm through wavelength, so
Can be obtained by the distribution character of 3 wavelength light.The function distributed image of the light of 3 different wave lengths is incorporated into a coordinate axess
On contrasted the angular distribution characteristic that just can determine that colorimetric parameter；When optical filter disk goes to the position for not letting alone what optical filter
When, survey the angular distribution characteristic for light intensity parameter.
6th step：When all of light is 512 × 512 into resolution through optical filter disk (5), spectral response range is covered
After the CCD camera (6) of 350～1100nm, can be imaged on photosurface with that, then through opto-electronic conversion.In the process,
For the light distribution of light source space establishes a mathematical model with the output distribution after CCD samplings, for light source space luminosity
Obtained by the mathematical model set up with the distribution character of colorimetric parameter angle and the relation of semi-integral ball inner surface light distribution.Its number
Learn model as follows：
If the light distribution of a certain wavelength of light source is IM, n The azimuth of the light distribution respectively under polar coordinate,
R is exported Jing after CCD samplingsM, n(X, Y).Wherein：
SP-1：Respectively by light distribution I of light sourceM, nWith the output distribution R after CCD samplingsM, nConstituting-functionses matrix is as follows：Structure
Into matrixConstitute matrixBy
IM, nA=RM, n, try to achieve A=RM, n·IM, n -1。
The wherein form of A is：
SP-2：The light source 50～100 of known surface spatial distribution is taken, allows it to survey through the CCD of system after numbering respectively
Go out its signal, according to matrix IM, nAnd RM, nWith equation of linear regression, or deflected secondary air, k transition matrix A can be obtained1、
A2…Ak。
SP-3：Seek the mean matrix of these matrixesThen average transition matrix B is exactly this method
The mathematical relationship set up.Calibrated with different optical filters, obtained the transition matrix B (λ) under different wave length.
SP-4：After establishing average transition matrix B (λ), any angle α on certain unknown light sourcei、βiLight intensity be
Can be according to the output distribution matrix R after average transition matrix B (λ) and CCD samplingsM, nTo determine.
Three primary colours wavelength for 435.8nm, 546.1nm, 700nm, can obtain light source R, G, B in different directions
Value, and then chromaticity coordinates (x, the y) value on different directions is obtained, so as to obtain the quick measurement of the angular distribution characteristic of colorimetric parameter.(x,
Y) it is as follows with the relation of R, G, B：
7th step：After CCD camera (6) output, finally by wired or be wirelessly transferred mutually online entrance computer
With calibrating patterns (7), result is calibrated inside computer.
Because the placement of non-spherical reflector (4) is eccentric, thus in CCD camera (6) into picture firstly the need of doing
Geometry deformation is calibrated, and accompanying drawing 4 and accompanying drawing 5 are exactly to carry out the contrast schematic diagram before and after geometry deformation calibration.Secondly system calibration, bag
Include following four steps：
SP-1：The output light source of a high uniformity is obtained using semi-integral ball (2)；
SP-2：By the angle spatially distributed functions of this output light source of High-precision angle photometer measurement, for value biography
Pass；
SP-3：Again this output light source is accessed this measuring system, obtain raw measurement data；
SP-4：Using High-precision angle photometer measurement data calibration system.
8th step：After having calibrated, result treatment is carried out with output.The output software of this measuring system include instrument calibration,
The functions such as data acquisition, data analysiss and process.Data analysis function therein include photometric measurement with analysis, colour measurement with
The various specificity analysises functions such as analysis.Accompanying drawing 6 and accompanying drawing 7 are part measurement result figures.
In whole measurement process, temperature control system (8) controls the internal operating ambient temperature of semi-integral ball (2),
Temperature is avoided to impact measurement result.It is comprised the following steps that：
SP-1：It is half-and-half long-pending by hygrosensor (801) according to the temperature range for having set on single-chip microcomputer (802)
Bulb separation (2) internal temperature is detected, and then temperature information is fed back to into single-chip microcomputer (802).
SP-2：According to the temperature information of feedback, single-chip microcomputer (802) is by ptc material in control PTC refrigeration systems (803)
Heat absorption speed changing semi-integral ball (2) internal temperature, reach semi-integral ball (2) internal temperature control in certain scope
Interior purpose.
Claims (8)
1. the Fast measurement system of a kind of light source luminosity and the angular distribution characteristic of colorimetric parameter, it is characterised in that including light source (1),
Semi-integral ball (2), baffle plate (3), non-spherical reflector (4), optical filter disk (5), CCD camera (6), computer (7), temperature control
System (8), diffuse-reflectance layer (9), black coating (10) are constituted；
The semi-integral ball (2) is made up of hemisphere face (21) and bottom surface (22), and its diameter dimension is 300～1500mm；Hemisphere face
Diffuse-reflectance layer (9) and black coating (10) are respectively coated with bottom surface inner surface；
Non-spherical reflector (4), baffle plate (3), the first circular hole (23) are set on semi-integral ball (2) bottom surface；Semi-integral ball (2)
Second circular hole (24) is set on hemisphere face；
The CCD camera (6) is arranged on the second circular hole (24) top；The optical filter disk (5) is arranged on CCD camera (6) and the
Between two circular holes (24)；
The light beam of light source transmitting is impinged upon on semi-integral ball sphere inner surface, Jing diffuse-reflectance layers (9), non-spherical reflector (4) reflection,
By the second circular hole, optical filter disk (5), detected by CCD camera (6)；Its signal is by computer (7) and calibrating patterns meter
Calculate, obtain the luminosity and the angular distribution characteristic of colorimetric parameter of light source；The calibrating patterns are comprised the following steps：
1) output light source of a high uniformity is obtained using the semi-integral；
2) output light source is measured by high precision direction gauge, for transmission of quantity value；
3) output light source is accessed local metering system, obtains raw measurement data；
Photometer measurement data calibration system is measured using High-precision angle.
2. the Fast measurement system of light source luminosity and the angular distribution characteristic of colorimetric parameter according to claim 1, it is characterised in that
The temperature control system (8) controls the ambient temperature of semi-integral ball (2) internal work, and it includes：Hygrosensor
(801), single-chip microcomputer (802), PTC refrigeration systems (803).
3. the Fast measurement system of light source luminosity and the angular distribution characteristic of colorimetric parameter according to claim 1, it is characterised in that：
The diffuse-reflectance layer (9) adopt diffuse-reflectance coefficient for 5%～10% barium sulfate or magnesium oxide or politef based on or its
The coating for combining；The black coating (10) is the black matt paint coatings that absorptance is 96%～99%.
4. the Fast measurement system of light source luminosity and the angular distribution characteristic of colorimetric parameter according to claim 1, it is characterised in that：
The non-spherical reflector (4) is arranged on away from the radius of the semi-integral ball (2) centre of sphere 1/3～1/2, for by table in hemisphere face
Face diffuses and reflexes to the CCD camera (6)；Non-spherical reflector (4) the plated surface reflection coefficient is more than 92%
High reflection thin film, its thin film includes being not limited to：Golden film, silverskin, aluminium film, the deielectric-coating of high low-refraction composition.
5. the Fast measurement system of light source luminosity and the angular distribution characteristic of colorimetric parameter according to claim 1, it is characterised in that：
The interferometric filter of 3～12 pieces of different wave lengths is provided with the optical filter disk (5), its wavelength includes：435.8nm、
546.1nm, 700nm, 450nm, 500nm, 590nm, 620nm, for light source space luminosity and colorimetric parameter angular distribution characteristic
Measurement.
6. the Fast measurement system of light source luminosity and the angular distribution characteristic of colorimetric parameter according to claim 1, it is characterised in that：
The shape of the non-spherical reflector (4) includes and is not limited to ellipsoid, parabola, hyperboloid and free form surface.
7. the Fast measurement system of light source luminosity and the angular distribution characteristic of colorimetric parameter according to claim 1, it is characterised in that：
The relation of the optical signal that light source luminosity and the angular distribution characteristic of colorimetric parameter are obtained with CCD is obtained by the mathematical model set up, its number
Learn model as follows：
If the light distribution of a certain wavelength of light source is θ is respectively the azimuth of the light distribution under polar coordinate, and Jing CCD are adopted
R is exported after samplem,n(X,Y)；Wherein：
By Im, nA=Rm, n, obtain：A=Im, n-1Rm, n
The form of A is：
During calibration：Light intensity space under known representative different wave length angular distribution light source k (k=50～100) is taken,
Allow its optical filter through system at that wavelength after numbering respectively, its signal is measured Jing after CCD, obtain multiple under the wavelength
IM, nAnd RM, nMatrix, with linear regression method, or deflected secondary air, obtain k transition matrix A under the wavelength1、A2…Ak,
Seek the mean matrix of these matrixes then average transition matrixIt is exactly mathematics that this method is set up
Model,
Calibrated with different optical filters, obtained the transition matrix B (λ) under different wave length,
For the angular distribution characteristic of luminosity and colorimetric parameter of certain light source to be measured, you can according to average transition matrix B (λ) and CCD
Output distribution matrix R after samplingM, nTo determine.
8. according to claim 1 or 5 or 7 light source luminosity and the angular distribution characteristic of colorimetric parameter Fast measurement system, it is special
Levy and be：The angular distribution characteristic of light intensity to the visible light wave range of light source, its wavelength at least includes：435.8nm、546.1nm、
The three primary colours wavelength of 700nm, so as to obtain light source R, G, B value in different directions, and then obtains the color on different directions
Coordinate (x, y) value, so as to obtain the quick measurement of the angular distribution characteristic of colorimetric parameter；(x, y) is as follows with the relation of R, G, B：
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109682472A (en) * | 2017-10-19 | 2019-04-26 | 红塔烟草(集团)有限责任公司 | Dome light source |
| CN109000886A (en) * | 2018-05-23 | 2018-12-14 | Oppo广东移动通信有限公司 | A kind of light source detection method and device thereof, equipment and storage medium |
| CN111458112B (en) * | 2020-06-19 | 2020-09-15 | 武汉精立电子技术有限公司 | Color coordinate measuring method, device, equipment and storage medium based on Gamma correction |
| CN114486183B (en) * | 2021-12-27 | 2024-02-23 | 杭州远方光电信息股份有限公司 | Lamp light distribution testing method and lamp light distribution measuring system |
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Address after: Hangzhou City, Zhejiang Province, Jianggan District Xiasha 310018 source Street No. 258 Applicant after: CHINA JILIANG UNIVERSITY Address before: Hangzhou City, Zhejiang Province, Jianggan District Xiasha 310018 source Street No. 258 Applicant before: China Jiliang University |
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Inventor after: Jin Huaizhou Inventor after: Jin Shangzhong Inventor after: Yang Chu Inventor after: Zeng Shanshan Inventor after: Lu Yuhong Inventor after: Shao Maofeng Inventor after: Zheng Jian Inventor before: Jin Shangzhong Inventor before: Yang Chu Inventor before: Zeng Shanshan Inventor before: Lu Yuhong Inventor before: Shao Maofeng Inventor before: Zheng Jian |
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Application publication date: 20140723 Assignee: Debang Lighting Co., Ltd. of Hengdian Group Assignor: China University of Metrology Contract record no.: X2019330000051 Denomination of invention: Quick measurement system for light source luminosity and chroma parameter angle distribution characteristics Granted publication date: 20170419 License type: Common License Record date: 20191216 |