CN101922968A - Automatic distance error correction luminance meter - Google Patents

Automatic distance error correction luminance meter Download PDF

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Publication number
CN101922968A
CN101922968A CN 201010237100 CN201010237100A CN101922968A CN 101922968 A CN101922968 A CN 101922968A CN 201010237100 CN201010237100 CN 201010237100 CN 201010237100 A CN201010237100 A CN 201010237100A CN 101922968 A CN101922968 A CN 101922968A
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CN
China
Prior art keywords
distance
image distance
photodetector
focusing
error correction
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CN 201010237100
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Chinese (zh)
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CN101922968B (en
Inventor
潘建根
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杭州远方光电信息有限公司
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Abstract

The invention discloses an automatic distance error correction luminance meter which comprises a case, a lens, a photoelectric detector and an electronic measurement and control unit. In the invention, the electronic measurement and control unit works out an image distance and a distance correction coefficient by utilizing a focuser arranged on the lens of the luminance meter and a corresponding image distance measurer or an image distance regulator, and the distance correction coefficient is used for correcting a measurement error caused by measurement distance changes of the luminance meter. The correction of the invention considers the coefficient change brought by the change of the reflectivity or the transmissivity of the lens and vignetting influences while the distance is changed and can be used for conveniently and precisely obtaining the luminance value of a measured light source.

Description

A kind of automatic distance error correction luminance meter

[technical field]

The present invention relates to a kind of optical radiation measurement device, especially a kind of brightness measuring device for camera with distance error zero offset capability.

[background technology]

Nitometer generally has imaging lens, measures brightness by the noncontact method, and according to its surveying work principle, utilizing geometrical optics and photometry knowledge to derive has following relation between the illumination of nitometer detector surface and the light-source brightness:

E = sτ 4 f 2 ( 1 - f 1 ) 2 L

Wherein, E is the illumination on the optical system imaging surface, i.e. the illumination of nitometer detector surface, L is the brightness of light source luminescent face, and s is effective area of plane of lens, and τ is the transmittance (transmissivity) of optical system, f is the focal length of lens, and l is the distance (being called measuring distance) of lens and light-emitting area.Take aim at the point type nitometer and be provided with the aperture field stop between camera lens and detector, above-mentioned illumination E passes through the illumination of the light beam of aperture field stop at detector surface, and brightness L only is the mean flow rate of corresponding district territory scope inner light source.Use above-mentioned nitometer to measure brightness and be based on light-source brightness and detector surface illumination and be directly proportional and realize, by formula as can be known, its response with apart between exist Funtcional relationship, even if a constant normal brightness, in case variable in distance, light-source brightness and detector surface illumination just do not become strict proportional relation, brightness measurement then can produce error.

The patent No. is that 86108696 patent " telescope that the long distance optical radiation measurement is used " discloses a kind of technical scheme: adopt a fixed aperture that does not move with imaging len, be fixed on the objective holder, to guarantee that the logical light solid angle that is transferred on the imaging surface under the different distance is a steady state value, technique scheme can be eliminated distance error to a certain extent.But, because the variation of measuring distance also can cause the variation of the transmissivity of light on lens and reflectivity, multiple other error components relevant with measuring distance such as variation of image quality, said method can't solve this difficult problem that still there is distance error in brightness measurement better, and fixed aperture is arranged between lens and the detector, gradual halation phenomena to tested distance sensitive easily takes place, thus the measuring error of bringing.

[summary of the invention]

According to above-mentioned the deficiencies in the prior art, the present invention aims to provide the nitometer of a kind of distance error from normal moveout correction, utilize the electronic surveying control module of nitometer to obtain image distance, and calculate the range correction coefficient automatically according to image distance, the brightness value that measures is revised, thereby reduced the measuring error brought because of variable in distance.

A kind of automatic distance error correction luminance meter of the present invention, comprise camera lens, one or more photodetectors and electronic surveying control module etc., between camera lens and at least one photodetector, has the aperture field stop, described camera lens comprises the focusing device of scalable image distance, it is characterized in that, image distance measuring appliance or image distance regulator are set on focusing device, described image distance measuring appliance or image distance regulator are electrically connected with the electronic surveying control module, the electronic surveying control module calculates image distance, and according to the size of image distance measurement result is carried out from normal moveout correction.

The range correction coefficient can obtain by calculating or calibrating in advance.Nitometer is measured same uniform luminance source at the minimum distance that can survey under a series of different distance of infinite distant place.When not having distance error, the measurement result under each distance should be identical.Utilize this principle, can obtain the relation between the brightness measurement sum of errors distance.Nitometer is measured the value of same uniform source of light and compare under the measured value under its scaled distance and different distance, obtain the range correction coefficient under a series of distances, obtain continuous range correction coefficient by difference approach.Come correcting measuring apart from the measured value after changing with the range correction coefficient, thereby can avoid or reduce making nitometer obtain accurate measurement result easily owing to measuring distance changes the measuring error that causes.

Index variation that eyeglass reflectivity or transmission change were brought when the technical program can be considered variable in distance and vignetting influence, by set up the correction model of brightness measurement sum of errors distance relation in the laboratory, carry out the software correction, can reach than higher measuring accuracy.

As preferably, focusing device is also referred to as focusing ring for change the focusing device of image distance by rotation.Perhaps, focusing device is for changing the load push-pull of image distance by elastic translation.

The focusing of automatic distance error correction luminance meter of the present invention can be a manual focus, or focusing automatically.

As a kind of technical scheme, described focusing device is the manual focus device, and the image distance measuring appliance is set on the focusing device, and described electronic surveying control module calculates image distance according to the measuring-signal of image distance measuring appliance.The user is by observing the picture of measured target, regulating focusing device makes imaging clear, the image distance measuring appliance is measured the image distance variation simultaneously, the electronic surveying control module calculates image distance and computed range correction coefficient C according to the measured value of image distance measuring appliance, be used for proofreading and correct the measured value of photodetector, thereby obtain comparatively accurate brightness value.

Above-mentioned image distance measuring appliance is the slide rheostat that links with focusing device.

As another kind of technical scheme, described focusing device is automatic focusing device.Above-mentioned image distance regulator is a motor, drives focusing device and move under the control of electronic surveying control module, and is clear up to imaging, and the control module of electronic surveying simultaneously calculates current image distance.Automatically the method for focusing is similar to the automatic focusing method of existing camera, generally realize by two kinds of methods: a kind of is active mode, infrared ray, ultrasound wave or generating laser and corresponding receiver promptly are set on nitometer, by receiving the measured target reflected signal, calculate the measurement object distance, and then calculating image distance, electronic surveying control module control image distance regulator is worked.Another kind is a passive mode, and promptly direct receiving and analyzing is reflective from scenery self, the mode of utilizing the phase differential principle to focus automatically.

As a kind of technical scheme, described photodetector is the single channel photodetector, is provided with the aperture field stop before the photodetector, also is provided with color filter or the color filter colour wheel of revising the photodetector spectral response before the photodetector.Generally speaking, the color filter that is provided with before the single channel photodetector 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.This technical scheme energy measurement passes the brightness (and colourity) of the light source of aperture field stop.

As a kind of technical scheme, described photodetector is the multichannel light electric explorer, and be provided with before each passage and revise the color filter of channel spectrum response separately, these color filters are complementary the spectral response of each passage respectively with color tristimulus values function generally speaking.Energy measurement passes the brightness and the colourity of the light source of aperture field stop in the technical program.

As a kind of technical scheme, have dispersion element before the photodetector, described photodetector is the multichannel array type photodetector of measure spectrum power.The spectral radiance and the colourity of the light source of aperture field stop is passed in nitometer measurement in the technical program.

As a kind of technical scheme, described photodetector is the combination of single channel photodetector and multichannel light electric explorer, the perhaps combination of two multichannel light electric explorers, on the light path behind the camera lens, optical splitter is set, enters described photodetector respectively through optical splitter from the light beam of camera lens.

In sum, the present invention calculates image distance and correction coefficient by electronic surveying control module meter, thereby realize the measurement result of nitometer is carried out range correction, the present invention has considered index variation and the vignetting influence that eyeglass reflectivity or transmission change are brought, and can make things convenient for accurately to obtain the measured light brightness value.

[description of drawings]

Accompanying drawing 1 is the structural representation of 1 one kinds of automatic distance error correction luminance meters of embodiment;

Accompanying drawing 2 is the structural representation of 2 one kinds of automatic distance error correction luminance meters of embodiment;

Accompanying drawing 3 is the structural representation of 3 one kinds of automatic distance error correction luminance meters of embodiment.

The 1-casing, 2-camera lens, 3-lens, 4-focusing device, 5-image distance measuring appliance, 6-aperture field stop, 7-photodetector, 7-1 first photodetector, 7-2 second photodetector, 8-color filter, the 8-1 first color filter colour wheel, 8-2 second color filter, 9-electronic surveying control module, 10-estimates passage, 12-measured target, 12-1 measured target aiming point, 13-dispersion element, 14-catoptron, 15-image distance regulator, 16-infrared emission receiver, host computer 17

[embodiment]

Embodiment 1:

As shown in Figure 1, a kind of automatic distance error correction luminance meter comprises casing 1, camera lens 2, lens 3, focusing device 4, image distance measuring appliance 5, aperture field stop 6, photodetector 7, color filter 8, electronic surveying control module 9 and range estimation path 10.Wherein, focusing device 4 and image distance measuring appliance 5 are arranged on the camera lens 2, and the focusing device 4 described in the present embodiment is rotatable focusing ring 4, and image distance measuring appliance 5 is a slide rheostat, and focusing ring 4 links to each other with slide rheostat.Photodetector 7 is the single channel photodetector, the light beam of the measured target aiming point 12-1 of measured target 12 enters in the casing 1 from camera lens 2, measured target aiming point 12-1 is imaged on the position of aperture field stop 6, described aperture field stop 6 is the narrow meshed catoptron in center, light beam separated into two parts from camera lens 2, a part is passed aperture field stop 6 and is arrived single pass photodetector 7, and another part is reflected to the range estimation path 10.Human eye is observed measured target 12 at the range estimation path 10, has a stain in viewing area, be since on aperture field stop 6 light beam of measured target aiming point 12-1 pass aperture and do not reflect and cause.Therefore, the stain position is the measured position of single pass photodetector 7, and the user can aim at measured target aiming point 12-1 exactly according to this phenomenon.Be provided with the color filter colour wheel 8 of revising the photodetector spectral response before the photodetector 7, the color filter on it is complementary the spectral response of photodetector 7 respectively with color tristimulus values function.Nitometer in the present embodiment is the energy measurement brightness and the colourity of passing the source region of aperture field stop 6 only.

The described a kind of automatic distance error correction luminance meter of present embodiment, its job step is as follows:

A) under certain measuring distance, calibrate record focusing device 4 positions;

B) camera lens 2 of described nitometer is aimed at the measured target 12 under another distance, by range estimation system 10, need to select the measured target aiming point 12-1 of measurement;

C) rotate focusing ring 4, make measured target 12, and will regulate after image and send to electronic surveying control module 9 apart from the electric signal of measuring appliance 5 at aperture field stop 6 place's blur-free imagings;

D) electronic surveying control module 9 is according to the electric signal of image distance measuring appliance 5 before and after regulating and calculate the range correction coefficient, and the measured value of correcting luminance meter automatically.

Embodiment 2:

As shown in Figure 2, a kind of automatic distance error correction luminance meter comprises casing 1, camera lens 2, lens 3, focusing device 4, image distance measuring appliance 5, aperture field stop 6, the first photodetector 7-1, the second photodetector 7-2, color filter 8, electronic surveying control module 9, dispersion element 13 and catoptron 14.Wherein, focusing device 4 and image distance measuring appliance 5 are arranged on the camera lens 2, and the focusing device 4 described in the present embodiment is rotatable focusing ring, and image distance measuring appliance 5 is a slide rheostat, and focusing ring links to each other with slide rheostat.The light beam of the measured target aiming point 12-1 of measured target 12 enters in the casing 1 from camera lens 2, measured target 12 is imaged on the position of aperture field stop 6, described aperture field stop 6 is the narrow meshed catoptron in center, light beam separated into two parts from camera lens 2, a part is passed aperture field stop 6 and is arrived the first photodetector 7-1, and another part is reflected to the second photodetector 7-2.

The first photodetector 7-1 in the present embodiment is arranged in the spectrometer, spectrometer is by catoptron 14, the dispersion element 13 and the first photodetector 7-1 form, and the dispersion element 13 in the present embodiment is concave gratings, and the first photodetector 7-1 is an array type multichannel light electric explorer.The light beam that passes the measured target aiming point 12-1 of aperture field stop 6 enters spectrometer through entrance slit, changing light path by catoptron 14 incides on the dispersion element 13, reflex on the first photodetector 7-1 through dispersion element 13 beam split and with dispersed light, the first photodetector 7-1 is electrically connected with electronic surveying control module 9, thereby obtains spectrum and the monochrome information of measured target aiming point 12-1.The second photodetector 7-2 in the present embodiment is a two dimension array type photodetector, be provided with the color filter 8 of revising the photodetector spectral response before the second photodetector 7-2, its spectral response and V (λ) function is complementary, thereby realizes measuring the function of measured target 12 each point brightness.And second photodetector 7-2 can also play the effect of aiming measured target aiming point 12-1, the stain in the second photodetector 7-2 institute altimetric image is the measured zone of the first photodetector 7-1.Electronic surveying control module 9 in the present embodiment is connected with host computer 17.

The described a kind of automatic distance error correction luminance meter of present embodiment, its job step is as follows:

A) under certain measuring distance, calibrate record focusing device 4 positions;

B) measured target 12 under another distance of camera lens 2 alignings of described nitometer by the image that the second photodetector 7-2 that shows in the host computer 17 measures, is selected the measured target aiming point 12-1 that need measure;

C) rotate focusing device 4, make measured target 12 at aperture field stop 6 place's blur-free imagings, promptly the second photodetector 7-2 measurement image is clear, and will regulate after image and send to electronic surveying control module 9 apart from the electric signal of measuring appliance 5;

D) electronic surveying control module 9 is according to the electric signal of slide rheostat before and after regulating and calculate the range correction coefficient, and from the measured value of the normal moveout correction first photodetector 7-1 and the second photodetector 7-2 nitometer.

The brightness that the described a kind of automatic distance error correction luminance meter of present embodiment both can have been measured each point in measured target 12 planes, spectrum and the brightness that can measure aiming point 12-1 again.

Embodiment 3:

As shown in Figure 3, a kind of automatic distance error correction luminance meter comprises casing 1, camera lens 2, lens 3, focusing device 4, image distance regulator 15, aperture field stop 6, the first photodetector 7-1, the first color filter colour wheel 8-1, the second photodetector 7-2, the second color filter 8-2, electronic surveying control module 9 and display screen 11.Wherein, focusing device 4 and image distance regulator 15 are arranged on the camera lens 2.Casing 1 is provided with infrared emission receiver 16, infrared emission receiver 16 is electrically connected with electronic surveying control module 9, can launch infrared ray, and receive the infrared ray that returns through measured object, thereby measure object distance, electronic surveying control module 9 calculates image distance according to object distance, and control image distance regulator 15 is regulated the position of focusing devices 4.Wherein image distance regulator 15 is the stepper motors that link with focusing device 4.Aperture field stop 6 is the narrow meshed catoptron in center, and from the light beam separated into two parts of camera lens 2, a part is passed aperture field stop 6 to first photodetector 7-1, and another part is reflected to the second photodetector 7-2.The first photodetector 7-1 is a single channel detector, is provided with the first color filter 8-1 that revises the first photodetector 7-1 spectral response before it, and its spectral response is complementary with color tristimulus values function respectively.The second photodetector 7-2 is the two dimension array type photodetector, is provided with the second color filter 8-2 that revises the second photodetector 7-2 spectral response before the second photodetector 7-2, and its spectral response and V (λ) function is complementary.Nitometer described in the present embodiment realizes measuring the brightness of each point in the measured light plane, accurately measures the brightness and the colourity of aiming point in it simultaneously.

The described a kind of image-type nitometer of present embodiment with automatic range correction function, its job step is as follows:

A) under certain measuring distance, calibrate record focusing device 4 positions;

B) measured target 12 under another distance of camera lens 2 alignings of described nitometer shows the image that the first photodetector 7-1 and the second photodetector 7-2 measure in the display screen 11, selects the measured target aiming point 12-1 that need measure;

C) 16 work of electronic surveying control module 9 control infrared emission receivers are measured object distance, and are calculated image distance, control image distance regulator 15 driving focusing devices 4 simultaneously and are subjected to displacement, thereby realize focusing automatically;

D) electronic surveying control module 9 calculates required image distance and calculates the range correction coefficient according to the image distance computing module, and from the measurement result of the normal moveout correction first photodetector 7-1 and the second photodetector 7-2.

Claims (8)

1. automatic distance error correction luminance meter, comprise casing (1), camera lens (2), one or more photodetectors (7) and electronic surveying control module (9), between camera lens (2) and at least one photodetector (7), has aperture field stop (6), the focusing device (4) that comprises the scalable image distance on the described camera lens (2), it is characterized in that, link with focusing device (4) and to be provided with image distance measuring appliance (5) or image distance regulator (15), described image distance measuring appliance (5) or image distance regulator (15) are electrically connected with electronic surveying control module (9), electronic surveying control module (9) calculates image distance, and according to the size of image distance measurement result is carried out from normal moveout correction.
2. a kind of automatic distance error correction luminance meter as claimed in claim 1 is characterized in that, described focusing device (4) is for changing the focusing ring of image distance by rotation.
3. a kind of automatic distance error correction luminance meter as claimed in claim 1 is characterized in that, described focusing device (4) is for changing the load push-pull of image distance by elastic translation.
4. a kind of automatic distance error correction luminance meter as claimed in claim 1, it is characterized in that, described focusing device (4) is the manual focus device, linking with focusing device (4) is provided with image distance measuring appliance (5), and described electronic surveying control module (9) calculates image distance according to the measuring-signal of image distance measuring appliance (5).
5. as claim 1 or 4 described a kind of automatic distance error correction luminance meters, it is characterized in that described image distance measuring appliance (5) is the slide rheostat that links with focusing device (4).
6. a kind of automatic distance error correction luminance meter as claimed in claim 1 is characterized in that, described image distance regulator (15) is a motor, image distance regulator (15) work under electronic surveying control module (9) control.
7. a kind of automatic distance error correction luminance meter as claimed in claim 1, it is characterized in that described photodetector (7) is one or more single channel photodetectors, the combination of perhaps one or more array type optical electric explorers, or single channel photodetector and array type optical electric explorer.
8. a kind of automatic distance error correction luminance meter as claimed in claim 1 is characterized in that, described photodetector (7) is the array type optical electric explorer, on the light path between described photodetector (7) and the camera lens (2) chromatic dispersion unit (13) is set.
CN2010102371008A 2010-07-26 2010-07-26 Automatic distance error correction luminance meter CN101922968B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108663375A (en) * 2018-08-29 2018-10-16 浙江霖研精密科技有限公司 A kind of 360 ° of open defect detection devices of inner ring
CN108882488A (en) * 2018-09-12 2018-11-23 青岛亿联客信息技术有限公司 Read and write automatic light control system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016150577A1 (en) * 2015-03-23 2016-09-29 Qiagen Lake Constance Gmbh Detector module

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US5200602A (en) * 1991-07-13 1993-04-06 Ricoh Company, Ltd. Distance measuring device of camera
CN1700082A (en) * 2004-04-28 2005-11-23 佳能株式会社 Image sensing device and control method thereof
CN101101235A (en) * 2007-07-09 2008-01-09 邱迦易 Quick-speed spectrophotometer
CN201748974U (en) * 2010-07-26 2011-02-16 杭州远方光电信息股份有限公司 Automatic distance error correction brightness meter

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
US5200602A (en) * 1991-07-13 1993-04-06 Ricoh Company, Ltd. Distance measuring device of camera
CN1700082A (en) * 2004-04-28 2005-11-23 佳能株式会社 Image sensing device and control method thereof
CN101101235A (en) * 2007-07-09 2008-01-09 邱迦易 Quick-speed spectrophotometer
CN201748974U (en) * 2010-07-26 2011-02-16 杭州远方光电信息股份有限公司 Automatic distance error correction brightness meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108663375A (en) * 2018-08-29 2018-10-16 浙江霖研精密科技有限公司 A kind of 360 ° of open defect detection devices of inner ring
CN108882488A (en) * 2018-09-12 2018-11-23 青岛亿联客信息技术有限公司 Read and write automatic light control system

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