CN101922967B - Zoom luminance meter - Google Patents
Zoom luminance meter Download PDFInfo
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- CN101922967B CN101922967B CN201010237097XA CN201010237097A CN101922967B CN 101922967 B CN101922967 B CN 101922967B CN 201010237097X A CN201010237097X A CN 201010237097XA CN 201010237097 A CN201010237097 A CN 201010237097A CN 101922967 B CN101922967 B CN 101922967B
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- photodetector
- luminance meter
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Abstract
The invention discloses a zoom luminance meter. The focal length of a lens of a luminance meter is changed conveniently by arranging a zoom device which is in linkage with a lens group on the lens so as to adjust a measurement view field angle. In the zoom luminance meter, a correction coefficient is calculated by an electronic measurement control unit through the change of the focal length measured by a focal length measuring device which is in linkage with the zoom device so as to realize accurate luminance measurement at different view field angles conveniently. The measurement view field selection of the zoom luminance meter of the invention is more flexible so as to avoid an alignment error caused by view field adjustment, accordingly realize higher luminance measurement accuracy.
Description
[technical field]
The present invention relates to a kind of brightness measurement, especially a kind of nitometer with zoom function.
[background technology]
Nitometer is a kind of instrument of Measurement of Luminance, is mainly used in Landscape Lighting engineering test, LED display test, LED-backlit test, LED traffic signals lamp test, LED lcd panel test, CCFL lamp test etc.Nitometer at present commonly used mainly contains takes aim at point type nitometer and brightness of image meter; The principle of work of taking aim at the point type nitometer commonly used is: the light beam of target to be measured is through being arranged on the object lens of nitometer front end; Be imaged on the catoptron of inclination, the circular hole that has a series of sizes not wait on the catoptron is called catoptron with holes; Light beam to be measured on the target to be measured passes catoptron with holes and optical filter, shines on the photodetector.Circular hole on the catoptron with holes is used as field stop, and the area actual to be measured on the target to be measured is by the diameter decision of circular hole.Rotate catoptron with holes, let light beam to be measured get into the circular hole of different-diameter on the catoptron with holes, thereby change the size that nitometer is measured field angle.And the principle of work of brightness of image meter commonly used is: the light beam of target to be measured is behind the object lens and optical filter that are arranged on the nitometer front end; Direct imaging is on two-dimensional array formula multichannel light electric explorer, thus the brightness of measuring the pairing target to be measured of each pixel.
Take aim at the pixel size of the light hole of the catoptron with holes on the point type nitometer, the two-dimensional array formula multichannel light electric explorer on the brightness of image meter; Focal length with the nitometer camera lens; Determined the size of the field angle of nitometer; Also therefore determined the measured zone of nitometer, field angle is big more, and measured zone is big more.Take aim at the point type nitometer in measuring process, generally through being distributed in the circular hole that a circle varies in size on the catoptron with holes, promptly field stop changes the size of field angle.But the difficult point of this method is a plurality of field angle when switching, because the circular hole center is difficult to be registered on the optical axis of photodetector, credit union brings measuring error in the high request field.And to regulate be can not be continuously adjustable in such visual field, often can not obtain satisfied field angle.And in the conventional images nitometer, total visual field of the visual field of each pixel and measurement is all fixed.In sum, existing nitometer changes in the measurement occasion of visual field at needs, because the defective of self always can not conveniently realize or inevitably bring measuring error.
[summary of the invention]
To the deficiency of above-mentioned prior art, the present invention aims to provide a kind of (or switching) field stop size that need not to change, and only need can simple and flexible change object space measurement field angle size through changing objective focal length, has the brightness measuring device for camera than high measurement accuracy.
A kind of Zoom luminance meter of the present invention comprises camera lens, photodetector, and wherein, camera lens is provided with varifocal lens combination and focusing device, it is characterized in that, said camera lens is provided with the zoom controller of the change lens focus that links with lens combination.Said Zoom luminance meter is focused according to required measurement field angle in the brightness measurement process.When lens focus changes; The measured visual field of said Zoom luminance meter correspondingly changes; Need not to regulate the size of field stop or the pixel size of two-dimensional array formula multichannel light electric explorer; Therefore the alignment error that brings because of the mechanical adjustment field stop can not occur, and it is easy to adjust to have a visual field, measures advantages such as visual field continuous variable.
Said focusing device is to change image distance through whole mobile lens group, until reaching suitable field angle, makes the measured object blur-free imaging, and is as shown in Figure 1.
Said zoom controller is to utilize moving of two or more lens (group) in the lens combination, thereby changes the focal length that interval between lens combination changes whole camera lens, and is as shown in Figure 1.
Also comprise the electronic surveying control module that can calculate the measurement update coefficient in the above-mentioned Zoom luminance meter according to the size that lens focus changes.
In order further to improve and to improve precision, said Zoom luminance meter comprises also and the focal length measurement device of zoom controller interlock that focal length measurement device is electrically connected with the electronic surveying control module.In the brightness measurement process; Focal length measurement device is transferred to the electronic surveying control module with measuring-signal; The electronic surveying control module is according to the variation of focal length and calculate correction coefficient, the measuring error that causes thereby the modifying factor focal length changes at the calibration model of setting in advance.
As preferably, set up the relation between the brightness measurement sum of errors focal length in the laboratory, and set up correction model.Nitometer is measured same uniform source of light under a series of different focal length, the brightness measurement result should be identical, calculates the focus correction coefficient under each different focal according to this principle.
As a kind of technical scheme, said zoom controller is the zoom ring that is arranged on the camera lens, changes the size that Zoom luminance meter is measured field angle through rotation; Perhaps, said zoom controller is for changing the load push-pull of focal length through elastic translation.
As a kind of technical scheme, said focal length measurement device is the slide rheostat that links to each other with the zoom ring.
As a kind of technical scheme; Photodetector of the present invention is the single channel photodetector; Be provided with catoptron with holes and color filter or the color filter colour wheel of revising the photodetector spectral response before the photodetector, catoptron with holes is in the image planes position of target to be measured.Generally speaking; The color filter that before the single channel photodetector, is provided with is complementary the spectral response of photodetector and human eye luminous efficiency function V (λ); When photodetector the place ahead was provided with the color filter colour wheel, the color filter on the general colour wheel made color filter that the response and the color tristimulus values function of incident beam are complementary respectively.Zoom luminance meter in the present technique scheme can be measured the measured target brightness and the colourity of passing catoptron with holes.
As a kind of technical scheme; Above-mentioned photodetector is the multichannel light electric explorer; Be provided with catoptron with holes before the multichannel light electric explorer; Be provided with before each passage and revise the color filter of channel spectrum response separately, the spectral response of each passage is complementary with color tristimulus values function respectively.Zoom luminance meter in the present technique scheme also can be measured the light-source brightness and the colourity of passing catoptron with holes.
As a kind of technical scheme, be provided with field stop behind the above-mentioned camera lens, this field stop can be above-mentioned catoptron with holes.Between field stop and photodetector, dispersion element is set, this dispersion element can be plane grating or concave grating.The present technique scheme promptly is provided with spectrometer after field stop, said dispersion element and photodetector all are the important component parts of spectrometer.As preferably, described dispersion element is a concave grating, and described photodetector is an array multichannel light electric explorer.The light beam that passes field stop reaches spectrometer inside, changes the direction of propagation by the reflective mirror in the spectrometer, incides on the concave grating, and chromatic dispersion and focusing through concave grating reflex to dispersed light on the array multichannel light electric explorer, and spectral response takes place.The Zoom luminance meter measuring beam of present technique scheme passes the brightness and the spectral radiance of the corresponding point of field stop.Because the entrance slit of spectrometer is generally less, the alignment issues that the method for traditional switching field stop possibly brought is particularly serious, so the present invention has good especially effect to adopting spectrometer as the Zoom luminance meter of measuring element.
As a kind of technical scheme; Above-mentioned photodetector also can be two-dimensional array formula multichannel light electric explorer; Photodetector is in the image planes position of target to be measured; Be provided with the color filter of revising the photodetector spectral response before the photodetector, this color filter generally makes the spectral response of each passage in the multichannel light electric explorer all be complementary with human eye luminous efficiency function V (λ).The Zoom luminance meter of present technique scheme can be measured the brightness of each point in the tested plane through primary sample, through changing focal length, can change total measurement visual field, the measurement visual field and the resolution of each pixel easily.
As a kind of technical scheme; On the light path behind the said Zoom luminance meter camera lens, also optical splitter can be set; Light beam from camera lens is divided into two bundles or most through optical splitter; Get into two or more corresponding photodetectors respectively, above-mentioned photodetector can be multichannel light electric explorer or single channel photodetector.
In sum, a kind of Zoom luminance meter of the present invention need not to change (or switching) catoptron light hole size with holes, only needs to change lens focus through zoom controller, can simple and flexible control survey field angle size.Said Zoom luminance meter also through electronic surveying control module calculation correction coefficient, has the focus correction function.Said Zoom luminance meter is not only applicable to take aim at a brightness and measures, and is applicable to the brightness of image measurement yet.
[description of drawings]
Accompanying drawing 1 is the principle schematic of zoom controller of the present invention;
Accompanying drawing 2 is the structural representation of embodiments of the invention 1;
Accompanying drawing 3 is the structural representation of embodiments of the invention 2;
Accompanying drawing 4 is the structural representation of embodiments of the invention 3;
The 1-camera lens; The 2-lens combination; Lens in the 2-1 lens combination 2; Lens in the 2-2 lens combination 2; The 3-zoom controller; The 4-focusing device; The 5-focal length measurement device; 6-catoptron with holes; The 7-photodetector; 8-color filter or color filter colour wheel; 9-estimates system; 10-electronic surveying control module; 11 display screens; 12-target to be measured; 12-1 Target Aim Points to be measured; The 13-spectrometer; The 14-dispersion element; The 15-reflective mirror.
As shown in Figure 2, a kind of Zoom luminance meter structural representation comprises camera lens 1, lens combination 2, zoom controller 3, focusing device 4, focal length measurement device 5, catoptron 6 with holes, photodetector 7, color filter colour wheel 8, range estimation system 9, electronic surveying control module 10.Wherein zoom controller 3 is to be arranged on zoom ring and the focusing ring on the camera lens with focusing device 4, can change focal length and image distance through rotation.Photodetector 7 is the single channel photodetector.
The Target Aim Points 12-1 light beam to be measured of target 12 to be measured gets into from camera lens 1; And be imaged on the position of catoptron 6 with holes; Said catoptron with holes 6 is middle narrow meshed catoptron; Light beam from camera lens 1 is divided into 2 parts, and a part is passed catoptron 6 with holes and arrived single pass photodetector 7, and another part is reflected to range estimation system 9.Human eye is observed target 12 to be measured in range estimation system 9; In viewing area, there is a stain; Be since on catoptron 6 with holes the light beam of Target Aim Points 12-1 to be measured pass aperture and do not reflect and cause; Therefore, the stain position is the measured position of photodetector 7, and the gauger can accurately aim at Target Aim Points 12-1 to be measured according to this phenomenon.After aiming at target 12 to be measured, the zoom controller 3 on the adjustment camera lens 1 is selected suitable measurement field angle.Behind the elected location survey weight range, the fixing position of zoom controller 3, the focusing device 4 on the rotating lens 1 seen target 12 to be measured until ability is clear.Electronic surveying control module 10 is according to the variation of focal length measurement device 5, the calculation correction coefficient.Be provided with optical filter colour wheel 8 before the photodetector 7, one group of color filter is arranged on the color filter colour wheel 8, spectral response and color tristimulus values function are complementary.Zoom luminance meter in the present embodiment has been realized brightness and the colour measurement of Target Aim Points 12-1, and can regulate easily and measure visual field size, the i.e. zone of Target Aim Points 12-1 through changing focal length.
Above-mentioned nitometer brightness measurement step is following:
I) earlier with Zoom luminance meter camera lens 1 aiming Target Aim Points 12-1 to be measured;
Ii) rotate zoom controller 3, regulate the focal length of Zoom luminance meter,, rotate focusing device 4 again and focus, make Target Aim Points 12-1 blur-free imaging to be measured until reaching suitable measurement field angle;
The brightness value of the Target Aim Points 12-1 to be measured that iii) confirms in ii) with the Zoom luminance meter measuring process;
Iv) focal length measurement device 5 becomes electric signal to be transferred to electronic surveying control module 10 size conversion of focal length variations, and electronic surveying control module 10 calculates correction coefficient according to corresponding electric signal, and the measurement result of step I in ii) proofreaied and correct;
V) export the correct brightness value.
As shown in Figure 3, a kind of Zoom luminance meter structural representation comprises camera lens 1, lens combination 2, zoom controller 3, focusing device 4, focal length measurement device 5, photodetector 7, color filter 8, electronic surveying control module 10 and display screen 11.Wherein zoom controller 3 is to be arranged on zoom ring and the focusing ring on the camera lens with focusing device 4, can change focal length and image distance through rotation.Photodetector 7 is a two-dimensional array formula multichannel light electric explorer.
The light beam of target 12 to be measured gets into from camera lens 1, is imaged on the photodetector 7.After aiming at target 12 to be measured, reserve the measurement field angle, adjust the zoom controller 3 on the camera lens 1 then according to predefined measurement range; After confirming focal length; The fixing position of zoom controller 3, the focusing device 4 on the rotating lens 1 is until clearly seeing measurement target 12 through display screen 11.Electronic surveying control module 10 is according to the variation of focal length measurement device 5, the calculation correction coefficient.Be provided with V (lamb) correction filter 8 before the photodetector 7, V (lamb) correction filter 8 all with human eye luminous efficiency function V (λ) is complementary the spectral response of each passage of photodetector 7.Described in the present embodiment the Zoom luminance meter brightness of measuring target 12 each points to be measured, and change easily through focus adjustment that to measure the visual field be the surface area and the resolution of target 12 to be measured.
Above-mentioned nitometer brightness measurement step is following:
I) earlier with Zoom luminance meter camera lens 1 aiming target 12 to be measured;
Ii) rotate zoom controller 3, regulate the focal length of Zoom luminance meter,, rotate focusing device 4 again and focus, make target 12 blur-free imagings to be measured until reaching suitable measurement field angle;
The brightness value of the target of iii) confirming in ii) with the Zoom luminance meter measuring process to be measured 12;
Iv) focal length measurement device 5 becomes electric signal to be transferred to electronic surveying control module 10 size conversion of focal length variations, and electronic surveying control module 10, is proofreaied and correct the measurement result of step I in ii) calculating correction coefficient according to corresponding electric signal;
V) export the correct brightness value.
As shown in Figure 4, a kind of Zoom luminance meter structural representation comprises camera lens 1, lens combination 2, zoom controller 3; Focusing device 4, focal length measurement device 5, catoptron 6 with holes, photodetector 7; Range estimation system 9, electronic surveying control module 10, spectrometer 13, dispersion element 14 and reflective mirror 15.Wherein zoom controller 3 is to be arranged on zoom ring and the focusing ring on the camera lens with focusing device 4, can change focal length and image distance through rotation.Spectrometer 13 is made up of photodetector 7, dispersion element 14 and reflective mirror 15.Dispersion element in the present embodiment is a concave grating 14, and described photodetector 7 is an array multichannel light electric explorer.
The Target Aim Points 12-1 light beam to be measured of target 12 to be measured gets into from camera lens 1; And be imaged on the position of catoptron 6 with holes; Said catoptron with holes 6 is middle narrow meshed catoptron; Light beam from camera lens 1 is divided into 2 parts, and a part is passed catoptron 6 with holes and arrived spectrometer 13, and another part is reflected to range estimation system 9.Pass the reflective mirror 15 change directions of propagation of light beam in spectrometer 13 of catoptron 6 with holes, reenter to be mapped to chromatic dispersion and focussing force take place on the concave grating 14, on photodetector 7, spectral response takes place.Human eye is observed target 12 to be measured in range estimation system 9; In viewing area, there is a stain; Be since on catoptron 6 with holes the light beam of Target Aim Points 12-1 to be measured pass aperture and do not reflect and cause; Therefore, the stain position is the measured position of photodetector 7, and the gauger can accurately aim at Target Aim Points 12-1 to be measured according to this phenomenon.After aiming at target 12 to be measured, the zoom controller 3 on the adjustment camera lens 1, this moment, the size of stain also can change thereupon, selected suitable measurement field angle in view of the above.Behind the elected location survey weight range, the fixing position of zoom controller 3, the focusing device 4 on the rotating lens 1 seen target 12 to be measured until ability is clear.Electronic surveying control module 10 is according to the variation of focal length measurement device 5, the calculation correction coefficient.Zoom luminance meter in the present embodiment can be measured the parameters such as spectral radiance, brightness and colourity of Target Aim Points 12-1 to be measured, and can pass through focus adjustment, regulates the size of Target Aim Points 12-1 to be measured easily.
Above-mentioned nitometer brightness measurement step is following:
I) earlier with Zoom luminance meter camera lens 1 aiming Target Aim Points 12-1 to be measured;
Ii) rotate zoom controller 3, regulate the focal length of Zoom luminance meter,, rotate focusing device 4 again and focus, make Target Aim Points 12-1 blur-free imaging to be measured until reaching suitable measurement field angle;
The brightness value of the Target Aim Points 12-1 to be measured that iii) confirms in ii) with the Zoom luminance meter measuring process;
Iv) focal length measurement device 5 becomes electric signal to be transferred to electronic surveying control module 10 size conversion of focal length variations, and electronic surveying control module 10 calculates correction coefficient according to corresponding electric signal, and the measurement result of step I in ii) proofreaied and correct;
V) export the correct brightness value.
Claims (7)
1. Zoom luminance meter; Comprise camera lens (1) and photodetector (7); Wherein, camera lens (1) is provided with lens combination (2) and focusing device (4), it is characterized in that; Said camera lens (1) is provided with the zoom controller (3) of change camera lens (1) focal length that links with lens combination (2); Also comprise the electronic surveying control module (10) that can calculate the measurement update coefficient according to the size that camera lens (1) focal length changes, also be provided with the focal length measurement device (5) that links with zoom controller (3) on the said camera lens (1), focal length measurement device (5) is electrically connected with electronic surveying control module (10).
2. a kind of Zoom luminance meter as claimed in claim 1 is characterized in that, described zoom controller (4) is for changing the zoom ring of focal length through rotation.
3. a kind of Zoom luminance meter as claimed in claim 1 is characterized in that, described zoom controller (4) is for changing the load push-pull of focal length through elastic translation.
4. a kind of Zoom luminance meter as claimed in claim 1 is characterized in that, described focal length measurement device (5) is the slide rheostat that links to each other with zoom controller (3).
5. like claim 1 or 2 or 3 described a kind of Zoom luminance meters, it is characterized in that preceding color filter or the color filter colour wheel (8) of revising photodetector (7) spectral response that be provided with of described photodetector (7).
6. like claim 1 or 2 or 3 described a kind of Zoom luminance meters; It is characterized in that; The preceding field stop (6) that is provided with of described photodetector (7); Between field stop (6) and photodetector (7), dispersion element (14) is set, described photodetector (7) is an array multichannel light electric explorer.
7. a kind of Zoom luminance meter as claimed in claim 5 is characterized in that, described photodetector (7) is a two-dimensional array formula multichannel light electric explorer, and photodetector is in the image planes position of camera lens (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010237097XA CN101922967B (en) | 2010-07-26 | 2010-07-26 | Zoom luminance meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010237097XA CN101922967B (en) | 2010-07-26 | 2010-07-26 | Zoom luminance meter |
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| Publication Number | Publication Date |
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| CN101922967A CN101922967A (en) | 2010-12-22 |
| CN101922967B true CN101922967B (en) | 2012-07-25 |
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| CN201010237097XA Expired - Fee Related CN101922967B (en) | 2010-07-26 | 2010-07-26 | Zoom luminance meter |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2069572U (en) * | 1990-04-18 | 1991-01-16 | 浙江大学 | Spectral optical system for brightness meter/colorimeter |
| JP3026030B2 (en) * | 1991-07-13 | 2000-03-27 | 株式会社リコー | Camera ranging device |
| CN2643297Y (en) * | 2003-02-22 | 2004-09-22 | 中国科学院安徽光学精密机械研究所 | High precision spectral radiance luminance meter |
| CN101101235A (en) * | 2007-07-09 | 2008-01-09 | 邱迦易 | Quick-speed spectrophotometer |
| CN101430225A (en) * | 2008-07-22 | 2009-05-13 | 沈锦祥 | Method for detecting mesoptic vision photometric quantity and double-photometry detection apparatus thereof |
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