CN100419398C - Field radiation calibration and calibrator for large-bore photoelectric system - Google Patents
Field radiation calibration and calibrator for large-bore photoelectric system Download PDFInfo
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- CN100419398C CN100419398C CNB2005101190288A CN200510119028A CN100419398C CN 100419398 C CN100419398 C CN 100419398C CN B2005101190288 A CNB2005101190288 A CN B2005101190288A CN 200510119028 A CN200510119028 A CN 200510119028A CN 100419398 C CN100419398 C CN 100419398C
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Abstract
The invention relates to a scaling method and the device of the large-bore photoelectric radiationdetector used in the field experiment. The method is that the output of the radiation scaling light source is smaller than the entrance pupil of the scaling optoelectronic system and the angle of divergence is bigger than the field angle of the scaling optoelectronic; the standard radiation resource scales to get the responsibility according to the reference radiometer; the reference radiometer scales to get the emergent radiation brightness according to the radiation scaling light source; the radiation scaling light source lights the scaled photoelectricity system to form the facula which is bigger than the detector area in the image surface to get the image number output and the irradiance responsibility. The device includes the detector, the chopper, the two clear apertures, the two primary mirrors, the two secondary mirrors, the two drawtubes, the light column, the cavity radiation resource and the linker; the small radiation scaling light source can reach the efficient of the big one; so it has the low weight, the low energy cost, the simple operation, the uniform image surface and the big radiation energy field.
Description
Technical field
The invention belongs to the photoelectricity radiation field of measuring technique, relate to the method and apparatus that the on-the-spot heavy caliber photoelectricity radiation measuring system of using of field trial is carried out radiation calibration.
Technical background
The task of photoelectricity radiation measuring system (hereinafter to be referred as electro-optical system) is the radiant quantity that measurement target is sent, and the output of this measuring system reality is electric signal, and this signal is relevant with the radiant quantity that target is sent.The purpose of radiation calibration is exactly the relation of determining between incident radiation amount and the output electric signal.The cardinal principle of radiation calibration is that the radiation source of known radiation value (can north source to national measurement standard) is placed on before the optics entrance pupil of target electro-optical system undetermined, according to the electric signal value of electro-optical system incident radiation value and its output, set up from radiation and be input to quantitative relationship between the output of electro-optical system final signal.The basic demand of radiation calibration is that one, the hot spot of calibration radiation source outgoing can evenly throw light on and be calibrated the detector of electro-optical system; Its two, the calibration radiation source the emergent radiation weight range be greater than by the calibration electro-optical system dynamic range.The basic skills of conventional electro-optical system radiation calibration (the inner infrared and electro-optical system handbook that uses) comprising: (the radiation source area is greater than electro-optical system optics entrance pupil area closely to expand the radiation source illumination, see Fig. 1), distant points radiation source illumination (Fig. 2) and point source illumination (Fig. 3) closely.In these three figure, the 1st, the radiation source of known radiant quantity, the 2nd, calibrated the entrance pupil of electro-optical system, the 3rd, calibrated the field stop of electro-optical system, the 4th, electro-optical system image planes (the electro-optical system detector places this).The characteristics of these radiation calibration methods are as follows respectively:
Closely expand radiation source illumination (Fig. 1): the radiation source 1 of area greater than electro-optical system entrance pupil area is placed on by before the calibration heavy caliber electro-optical system entrance pupil 2, and both distances will guarantee that the radiation of reference source is full of by the visual field and the aperture of calibration electro-optical system.Electro-optical system is calibrated in direct illumination in this way, can form one evenly and greater than the hot spot of image planes 4 sizes (detector size) on the electro-optical system detector, can calibrate out the spoke luminosity response degree of any pixel of electro-optical system detector simultaneously.This method is a kind of more satisfactory laboratory radiation calibration method.The used large tracts of land radiation source of calibration has integrating sphere light source (can see near-infrared band) and large tracts of land blackbody radiation source (medium wave is to long wave infrared region) etc. at present.But using the on-the-spot heavy caliber electro-optical system is calibrated of this method in the open air is subject to many limitations: one, the weight of radiometric calibration device, volume and power consumption are all very big, are unfavorable for that promptly transportation, installation also are unfavorable for operation and maintenance; Its two, large tracts of land calibrated radiation source manufacturing technology complexity, technology difficulty is big, is difficult to guarantee under the on-the-spot in the open air service condition of performance index (as the stability, uniformity of surface emissivity degree, cosine radiation characteristic etc.); Because cost is too high, do not accepted in addition by the user.
Distant points radiation source illumination (Fig. 2): point source 1 away from heavy caliber electro-optical system entrance pupil 2 to its direct illumination, distance between the two is greater than by more than 10 times of calibration electro-optical system optical focal length, and guarantee on image planes 4, to form a point source image, can calibrate out the incident radiation flux (or illumination) of electro-optical system and the response relation between the output electric signal.This calibrating method is calibrated the heavy caliber electro-optical system with the direct illumination of small size radiation source, though can reduce volume, the weight of robot scaling equipment, but because imaging relations, at a time this calibrating method can only be calibrated the part pixel (about 10 pixels) of electro-optical system imaging detector, this is for the electro-optical system imaging detector more than 100,000 pixels easily on the image planes, the scale operation of finishing whole pixels is numerous and diverse, and workload is too big, so this method is inapplicable for calibration heavy caliber electro-optical system; Secondly calibrated electro-optical system with this method direct illumination, the hot spot that forms on image planes is uneven yet, can't satisfy calibration precision.
Point source illumination (Fig. 3) closely: with pointolite 1 be placed on by near the calibration electro-optical system entrance pupil 2 to its direct illumination, this illumination (Jones's method) can obtain the even illumination hot spot of an expansion on by the image planes 4 of scaling system.Its subject matter is that the emittance decay of inciding on the image planes 4 is very serious, and the amplitude of spoke brightness decay is A
P/ A
S(A
PBe the entrance pupil useful area of electro-optical system, A
SEfficient lighting area for small light source) doubly.Therefore this method is suitable for carrying out radiation calibration to measuring dark weak target or the little electro-optical system of dynamic range, and for A
P/ A
SElectro-optical system more than 〉=6000 because the emittance decay of inciding on the image planes is very serious, can not satisfy the radiation calibration requirement of its great dynamic range.In our specific embodiment, radiation calibration requires to adopt infrared chamber type radiation source, because on-the-spot power consumption and present technology, process technology limit, this radiation source can only accomplish that stable working temperature is up to 1500K, the exit pupil diameter 8mm of opening, and the entrance pupil diameter of calibration electro-optical system reaches 670mm, made the energy attenuation incided on the image planes more than 7000 times, very faint, therefore adopting this calibrating method, the problem of being brought is to have introduced bigger calibration error on the one hand, can only calibrate in very little dynamic range on the other hand, can not satisfy the calibration requirement, so this method is also inapplicable.
Summary of the invention
In the background technology, for large tracts of land calibrated radiation source illumination, because the development technical sophistication of large tracts of land calibrated radiation source, technology difficulty are big, performance index are difficult to guarantee, and cost height, weight, volume and power consumption are big, transportation, installation, operation and maintenance are all inconvenient; Distant points radiation source illumination finishes that the scale operation of whole pixels is numerous and diverse, workload big, the image planes of hot spot are inhomogeneous, then can't satisfy calibration precision; Point source illumination closely, spoke brightness is low can not be satisfied by the requirement of calibration electro-optical system dynamic range, big, inapplicable at the scene as increasing the power consumption that spoke brightness needs; Above-mentioned three methods all are not suitable for the field condition of heavy caliber electro-optical system and demarcate, in order to address the above problem, to the objective of the invention is to provide and utilize small size radiation source realization spread illumination the heavy caliber electro-optical system to be carried out the method and the device of field condition radiation calibration.
The method that the present invention carries out radiation calibration to the heavy caliber electro-optical system is as follows: a. is placed on uniform small size radiation source on the focal plane of parallel light tube, make incorporate radiation calibration light source, radiation calibration light source discharge area is less than the entrance pupil area of being calibrated electro-optical system; B. according to the angle of divergence that can be provided the radiation calibration light source by the observation field angle of calibration electro-optical system, the angle of divergence that makes the radiation calibration light source is greater than the observation field angle of being calibrated electro-optical system; C. utilize the calibrated radiation source (can north source to national measurement standard) of known radiant quantity that reference radiometer is calibrated, obtain the responsiveness of reference radiometer; D. by reference radiometer the radiation calibration light source is calibrated, obtained the emergent radiation brightness B of radiation calibration light source
λ, this process has promptly been finished the metering transmission of national measurement standard to the radiation calibration light source; E. calibrated electro-optical system with the illumination of radiation calibration light source, make and on its image planes, formed evenly and calibrate the hot spot of electro-optical system detector area after the imaging of calibration electro-optical system greater than quilt, on its image planes, realize the radiation source illumination of expansion, can obtain being calibrated the number output DN of electro-optical system image, and then obtain being calibrated the irradiance responsiveness R of electro-optical system
SYS, then finish heavy caliber electro-optical system field condition radiation calibration.
Described irradiance responsiveness is:
In the formula,
F-is calibrated the focal length of electro-optical system;
A
D-by the area of the single pixel of detector in the electro-optical system of calibrating;
DN
B-record by the digital output of the details in a play not acted out on stage, but told through dialogues of calibration electro-optical system;
A
O-calibrated the optics receiving area of electro-optical system;
M-is calibrated the electro-optical system the ratio of obstruction;
A
SThe effective emittance area of-radiation calibration light source.
Radiometric calibration device of the present invention comprises reference radiometer and radiation calibration light source, and reference radiometer comprises: detector, chopper, light hole, primary mirror, secondary mirror, lens barrel; The radiation calibration light source comprises: first lens barrel, first secondary mirror, first primary mirror, first light hole, Guang Lan, chamber type radiation source, connector;
In reference radiometer, the optical axis of secondary mirror and primary mirror optical axis included angle are 45 °, the reflecting surface of primary mirror and secondary mirror is staggered relatively and be fixed in the lens barrel, detector and chopper are positioned at the lens barrel outside, and primary mirror is fixed to the bottom of lens barrel, and the light hole with the secondary mirror light shaft coaxle is arranged on lens barrel, the reflecting surface of secondary mirror is aimed at the inwall of light hole and lens barrel, chopper is between detector and light hole, and chopper is sidelong and puts near detector one, and detector is installed in the focus place of primary mirror;
In the radiation calibration light source, first secondary mirror and first primary mirror are arranged in first lens barrel, the light hurdle is arranged outside first lens barrel, chamber type radiation source and connector, first light hole with the first secondary mirror light shaft coaxle is arranged on first lens barrel, first primary mirror is between the bottom and first secondary mirror of first lens barrel, and first primary mirror and first secondary mirror install and fix on first lens barrel, the reflecting surface of first primary mirror and first secondary mirror is staggered relatively, the reflecting surface of first secondary mirror is aimed at the inwall of first light hole and first lens barrel, the light field is between the chamber type radiation source and first light hole, and the light hurdle is placed on the focal position of first primary mirror, chamber type radiation source is sidelong near light hurdle one and is put, and the optical axis of first secondary mirror and the first primary mirror optical axis included angle are 45 °; When the radiation calibration light source being calibrated, lens barrel is fixedlyed connected by connector with first lens barrel with reference radiometer.
Good effect of the present invention:
Adopted the design philosophy that little radiating surface source is extended to picture among the present invention, successfully develop the radiation calibration light source, with this radiation calibration light source the electro-optical system of being calibrated is thrown light on, the radiation that forms an expansion on by the image planes of the calibration electro-optical system hot spot that evenly throws light on, covered by the detector of calibration electro-optical system, make it along being moved by the radial direction and the circumferencial direction of calibration electro-optical system optics bore, to being carried out unified radiation calibration, obtain to carry out the effect of radiation calibration with the large tracts of land radiation source by the calibration electro-optical system; To the calibration of radiation calibration light source, finished of the metering transmission of national measurement standard by reference radiometer, made the output radiation amount of radiation calibration light source become known quantity to the radiation calibration light source; Apparatus of the present invention have advantages such as volume is little, in light weight, low in energy consumption, simple to operate, the image planes of hot spot even, output radiation energy dynamics scope is big, a series of difficult problems have been solved to the on-the-spot radiation calibration of heavy caliber electro-optical system, solved promptly that large tracts of land calibrated radiation source technical sophistication, technology difficulty are big, performance index are difficult to guarantee and cost is too high and weight, volume and power consumption are all very big, promptly are unfavorable for transporting, installing a difficult problem that also is unfavorable for operation and maintenance; Also solve distant points radiation source illumination and finished that whole pixel scale operations are numerous and diverse, workload big, the image planes of hot spot are inhomogeneous, can't satisfy the problem of calibration precision; Also solved closely point source illumination, point source emittance dynamic range can not satisfy the problem that is required by calibration electro-optical system dynamic range.
Radiation calibration method of the present invention and robot scaling equipment are particularly suitable for the heavy caliber photoelectricity radiation measuring system that use in the field is carried out the scene calibration, have obtained practical application, and effect is fine.In addition, this radiation calibration method and robot scaling equipment also can use in the laboratory.
Description of drawings
Fig. 1 background technology is closely expanded radiation source illumination calibration schematic diagram;
Fig. 2 background technology distant points radiation source illumination calibration schematic diagram;
Fig. 3 background technology is point source illumination calibration schematic diagram closely;
Fig. 4 radiation calibration process flow diagram flow chart of the present invention also is a Figure of abstract;
The on-the-spot radiation calibration schematic diagram of Fig. 5 the present invention;
Fig. 6 reference radiometer structural representation of the present invention;
Fig. 7 radiation calibration light source of the present invention structural representation.
Embodiment
Embodiment 1: as shown in Figure 4: before the calibration electro-optical system, at first calibrate with 5 pairs of reference radiometers 6 of calibrated radiation source, obtain the responsiveness 7 of reference radiometer 6, again reference radiometer 6 is docked by connector 22 with radiation calibration light source 8, measure the output spoke brightness B of radiation calibration light source 8
λWhen the calibration electro-optical system, according to the on-the-spot radiation calibration of enforcement shown in Figure 5, radiation calibration light source 8 is installed in multidimensional adjusts on the support, make it can carry out unified radiation calibration to being calibrated electro-optical system along being moved by the radial direction and the circumferencial direction of calibration electro-optical system 9 optics bores.With radiation calibration light source 8 close being placed on, and make its optical axis and parallel, can draw at different spoke brightness B by the optical axis of calibration electro-optical system 9 by the entrance pupil place of calibration electro-optical system 9
λThe digital DN of the output of following electro-optical system, by formula (1) can be set up at the scene by the irradiance responsiveness R of calibration electro-optical system 9
SYS
Radiometric calibration device of the present invention comprises reference radiometer 6 and radiation calibration light source 8.Reference radiometer 6 comprises: detector 10, chopper 11, light hole 12, primary mirror 13, secondary mirror 14, lens barrel 15; Radiation calibration light source 8 comprises: first lens barrel 16, first secondary mirror 17, first primary mirror 18, first light hole 19, light hurdle 20, chamber type radiation source 21, connector 22.The optical system of reference radiometer 6 adopts typical newton system; Detector 10 can adopt infrared eye or visible-light detector according to being selected by the service band of calibration electro-optical system; Chopper 11 adopts the precision optical machinery chopper; On lens barrel 15 bodies, have light hole 12 with light shaft coaxle; Primary mirror 13 can adopt spherical reflector or off-axis aspheric surface catoptron; Secondary mirror 14 can adopt water chestnut mirror or plane mirror.Primary mirror 13 and secondary mirror 14 are integrated and all install and fix on the lens barrel 15.Primary mirror 13 adopts metal material (as aluminium) or optical glass material etc. to make, and processes through quadric surface, and is coated with high-reflecting film at its curved surface, and the wave band of high-reflecting film is according to being selected by the service band of calibration electro-optical system; Secondary mirror 14 adopts metal material (as aluminium) or optical glass material etc. to make, and processes through the plane, and is coated with high-reflecting film on its plane, and the wave band of high-reflecting film is according to being selected by the service band of calibration electro-optical system; Lens barrel 15 can adopt the material of aluminium alloy or light weight, good rigidity to make, and lens barrel 15 domestic demand eliminate stray lights are handled.
Present embodiment reference radiometer the key technical indexes:
● visual field: 0.3 °;
● the ratio of obstruction: 1/4;
● effective entrance pupil diameter: 100mm
● focal length: 300mm
● noise equivalent radiance: 10
-9Wm
-2Sr
-1μ m
-1
Optical system in the radiation calibration light source 8 also is to adopt the newton system, first primary mirror 18 adopts spherical reflector or off-axis aspheric surface catoptron, and make with metal material (as aluminium) or optical glass material etc., through quadric surface processing, be coated with high-reflecting film at its curved surface, the wave band of high-reflecting film is according to being selected by the service band of calibration electro-optical system; First secondary mirror 17 adopts water chestnut mirror or plane mirror, makes with metal material (as aluminium) or optical glass material etc., through plane processing, is coated with high-reflecting film on its plane, and the wave band of high-reflecting film is according to being selected by the service band of calibration electro-optical system; The optical axis of first secondary mirror 17 and first primary mirror, 18 optical axis included angles are 45 °, and first primary mirror and first secondary mirror are integrated and all install and fix on first lens barrel 16; Chamber type radiation source 21 is black (ash) body; On first lens barrel, 16 bodies, have first light hole 19 with light shaft coaxle; Light hurdle 20 is installed on the focal plane of the optical system that first primary mirror 18 and first secondary mirror 17 constitute, the light path coaxial of first light hole 19 and above-mentioned optical system; First lens barrel 16 is made by the material of aluminium alloy or light weight, good rigidity, has implemented the eliminate stray light processing in first lens barrel 16, on first lens barrel 16 connector 22 is arranged, and is convenient to the two butt joint with 8 calibrations of 6 pairs of radiation calibration light sources of reference radiometer the time.
The key technical indexes of present embodiment radiation calibration light source 8:
● chamber type radiation source working temperature: room temperature～1500K;
● focal length: 300mm;
● exit pupil diameter: 100mm;
● the ratio of obstruction: 1/4;
● the angle of divergence: 34.7 ' (light hurdle diameter 3mm);
● degree of stability: 0.25%;
● heterogeneity is less than 1.0%.
The embodiment of the invention is better than 5% to the precision of heavy caliber infrared electro systems radiate calibration.
The embodiment of the invention is the radiometric calibration device at infrared heavy caliber electro-optical system development.
Embodiment 2:
Change the infrared band chamber type radiation source of radiation calibration light source into the visible light wave range light source, workplace with primary mirror 13 and secondary mirror 14, first secondary mirror 17 and first primary mirror 18 is coated with the visible light wave range high-reflecting film again, detector 10 adopts the visible light wave range detector, other parts are identical with embodiment 1, and then the present invention just can carry out radiation calibration to the heavy caliber electro-optical system of visible light wave range.
Except the foregoing description, the embodiment in category of the present invention no longer is described in detail.
Claims (3)
1. the method for heavy caliber electro-optical system field condition radiation calibration is characterized in that the step of radiation calibration is as follows:
A. uniform small size radiation source is placed on the focal plane of parallel light tube, makes incorporate radiation calibration light source, radiation calibration light source discharge area is less than the entrance pupil area of being calibrated electro-optical system;
B. according to the angle of divergence that can be provided the radiation calibration light source by the observation field angle of calibration electro-optical system, the angle of divergence that makes the radiation calibration light source is greater than the observation field angle of being calibrated electro-optical system;
C. utilize the calibrated radiation source of known radiant quantity that reference radiometer is calibrated, obtain the responsiveness of reference radiometer;
D. by reference radiometer the radiation calibration light source is calibrated, obtained the emergent radiation brightness B of radiation calibration light source
λ, this process has promptly been finished the metering transmission of national measurement standard to the radiation calibration light source;
E. calibrated electro-optical system with the illumination of radiation calibration light source, make and on its image planes, formed evenly and calibrate the hot spot of electro-optical system detector area after the imaging of calibration electro-optical system greater than quilt, on its image planes, realize the radiation source illumination of expansion, can obtain being calibrated the number output DN of electro-optical system image, and then obtain being calibrated the irradiance responsiveness R of electro-optical system
SYS, then finish heavy caliber electro-optical system field condition radiation calibration.
2. the method for heavy caliber electro-optical system field condition radiation calibration according to claim 1 is characterized in that:
Described irradiance responsiveness is:
In the formula,
F-is calibrated the focal length of electro-optical system;
A
D-by the area of the single pixel of detector in the electro-optical system of calibrating;
DN
B-record by the digital output of the details in a play not acted out on stage, but told through dialogues of calibration electro-optical system;
A
O-calibrated the optics receiving area of electro-optical system;
M-is calibrated the electro-optical system the ratio of obstruction;
A
SThe effective emittance area of-radiation calibration light source.
3. heavy caliber electro-optical system field condition radiometric calibration device, it is characterized in that: comprise reference radiometer (6) and radiation calibration light source (8), reference radiometer (6) comprising: detector (10), chopper (11), light hole (12), primary mirror (13), secondary mirror (14), lens barrel (15); Radiation calibration light source (8) comprising: first lens barrel (16), first secondary mirror (17), first primary mirror (18), first light hole (19), light hurdle (20), chamber type radiation source (21), connector (22);
In reference radiometer (6), the optical axis of secondary mirror (14) and primary mirror (13) optical axis included angle are 45 °, the reflecting surface of primary mirror (13) and secondary mirror (14) is staggered relatively and be fixed to lens barrel (15) lining, detector (10) and chopper (11) are positioned at lens barrel (15) outside, primary mirror (13) is fixed to the bottom of lens barrel (15), light hole (12) with secondary mirror (14) light shaft coaxle is arranged on lens barrel (15), the reflecting surface of secondary mirror (14) is aimed at the inwall of light hole (12) and lens barrel (15), chopper (11) is positioned between detector (10) and the light hole (12), and chopper (11) is sidelong and puts near detector (10), and detector (10) is installed in the focus place of primary mirror (13);
In radiation calibration light source (8), first secondary mirror (17) and first primary mirror (18) are arranged in first lens barrel (16), light hurdle (20) is arranged outside first lens barrel (16), chamber type radiation source (21) and connector (22), first light hole (19) with first secondary mirror (17) light shaft coaxle is arranged on first lens barrel (16), first primary mirror (18) is positioned between the bottom and first secondary mirror (17) of first lens barrel (16), and first primary mirror (18) installs and fixes on first lens barrel (16) with first secondary mirror (17), first primary mirror (18) is staggered relatively with the reflecting surface of first secondary mirror (17), the reflecting surface of first secondary mirror (17) is aimed at the inwall of first light hole (19) and first lens barrel (16), light hurdle (20) is positioned between chamber type radiation source (21) and first light hole (19), and light hurdle (20) are placed on the focal position of first primary mirror (18), chamber type radiation source (21) is sidelong near light hurdle (20) and is put, and the optical axis of first secondary mirror (17) and first primary mirror (18) optical axis included angle are 45 °; When radiation calibration light source (8) being calibrated, lens barrel (15) is fixedlyed connected by connector (22) with first lens barrel (16) with reference radiometer (6).
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| CNB2005101190288A CN100419398C (en) | 2005-11-29 | 2005-11-29 | Field radiation calibration and calibrator for large-bore photoelectric system |
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| CNB2005101190288A CN100419398C (en) | 2005-11-29 | 2005-11-29 | Field radiation calibration and calibrator for large-bore photoelectric system |
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Families Citing this family (10)
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|---|---|---|---|---|
| CN102636336B (en) * | 2012-04-19 | 2014-10-08 | 北京理工大学 | Method for testing operating distance of active near-infrared camera based on equivalent illumination and MRC (Minimum Resolvable Contrast) |
| CN102645321B (en) * | 2012-04-19 | 2014-09-10 | 公安部第一研究所 | Active near-infrared camera operating distance evaluation system based equivalent illumination |
| CN104568160A (en) * | 2015-01-21 | 2015-04-29 | 中国科学院上海技术物理研究所 | Calibrating equivalent optical system for large-caliber infrared system |
| CN107817053B (en) * | 2017-09-28 | 2019-08-23 | 中国科学院长春光学精密机械与物理研究所 | A kind of heavy caliber infrared radiation measurement system calibrating method and device |
| CN109029496B (en) * | 2018-05-30 | 2022-03-08 | 北京市遥感信息研究所 | Single-field radiation calibration method suitable for large-area-array optical camera |
| CN109297685A (en) * | 2018-11-15 | 2019-02-01 | 中国电子科技集团公司第四十研究所 | A kind of spectral transmittance test device and method for heavy caliber parallel light tube |
| CN109506901B (en) * | 2019-01-21 | 2020-06-16 | 中国科学院合肥物质科学研究院 | Debugging method of light source device |
| CN112683494B (en) * | 2020-12-03 | 2023-05-09 | 西安科佳光电科技有限公司 | Device and method for testing comprehensive performance parameters of optical lens |
| CN113252307B (en) * | 2021-04-08 | 2022-06-14 | 中国科学院长春光学精密机械与物理研究所 | Space-borne radiometric calibration method and device thereof |
| CN116046169B (en) * | 2023-03-31 | 2023-07-21 | 中国科学院光电技术研究所 | Automatic calibration method for point target multi-channel infrared spectrum radiation |
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| US5204733A (en) * | 1989-12-22 | 1993-04-20 | Centre National D'etudes Spatiales | Apparatus for calibrating an optical instrument, and applications thereof |
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