CN105157827A - Integrating sphere transmission radiometer for ontrack spectrum radiation absolute calibration for remote sensor - Google Patents
Integrating sphere transmission radiometer for ontrack spectrum radiation absolute calibration for remote sensor Download PDFInfo
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- CN105157827A CN105157827A CN201510197080.9A CN201510197080A CN105157827A CN 105157827 A CN105157827 A CN 105157827A CN 201510197080 A CN201510197080 A CN 201510197080A CN 105157827 A CN105157827 A CN 105157827A
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Abstract
An integrating sphere transmission radiometer for ontrack spectrum radiation absolute calibration for a remote sensor belongs to the field of ontrack spectrum radiation calibration for a remote sensor. The radiometer comprises an integrating sphere main body, an optical filter detector module and a photoelectric measuring module. The integrating sphere main body is equipped with two openings inside. Reflected light enters, through the two openings, the optical filter detector module and the photoelectric measuring module that are fixed outside the integrating sphere main body. Diffuse reflection paint coats the inside of the integrating sphere main body. The integrating sphere transmission radiometer has the capability of measuring low-power signals in a highly precise manner, exhibits the stable performance for a long period of time, and can serve as a standard space ontrack traceablility low temperature radiometer. The integrating sphere transmission radiometer has the characteristics of converting a power reference into a radiance reference and exhibiting high resolution and low uncertainty reference transmission, so the problem of high-precision ontrack traceablility to SI spectrum radiance absolute calibration for an imaging spectrometer, a satellite remote sensor load and the like is well solved.
Description
Technical field
The invention belongs to remote sensor spectral radiometric calibration field in-orbit, relate to a kind of for satellite remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer.
Background technology
Along with the mankind are to the lasting further investigation of some significant problems such as global warming, high resolving power earth observation, extreme hazard forecasting, more and more urgent to the demand can traced to the source to the high-quality spacer remote sensing data of unified radiation benchmark.Because existing satellite optical remote sensing load spectral radiometric calibration lacks high-precision unified radiation benchmark, cause the remotely-sensed data of a large amount of satellite to there is larger measuring error, make existing remote sensing satellite be difficult to meet a large amount of science data demand in some field such as weather, resources and environment.For meeting the Research Requirements to earth climatological observation, various space tasks provides a large amount of observation datas, and the quality of data and the reliability of announcement precision and adequacy become the key that data effectively use.But in space service, especially for optical sensor, although the ground calibration means before launching are perfect, calibration precision is high, but due to emission process vibrations and the impacts such as rear space environment of entering the orbit, there is decay and drift in radiation scale in-orbit, radiation datum tool chain ruptures, and causes the instrument after entering the orbit cannot trace to the source to SI (international base unit system---theinternationalsystemofunitsofmeasurement).In order to improve In-flight calibration precision, make the primary standard magnitude in its uncertainty level and national measurement laboratory suitable, need the space-orbit radiation datum tool system setting up the SI that strictly can trace to the source, set up the quality of data and the data precision hierarchy of control thus, mechanism, specification is carried out to remote sensing radiation calibration, what ensure that all direct acquisition data or active output data can both be authentic and valid is traceable to SI, with unprecedented low uncertainty level in-orbit, the parameter affecting climate change is monitored.Because total solar irradiance and spectral irradiance can be thought stable in long yardstick, so using the radiation source of the sun as remote sensor in-orbit, utilize space low temperature radiometer to measure it, form the datum tool system of the SI that can trace to the source thus.But due to the restriction of space loading volume weight, directly cause the solar radiation value of reception limited, when it is applied to narrow bandwidth spectral coverage rank, radiation value is very faint, and how being monitored and being used for remote sensor spectral radiometric calibration is key issue.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of SI that traces to the source, high integration, high-acruracy survey for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer.
The technical scheme that technical solution problem of the present invention adopts is as follows:
For remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, this radiometer comprises: integrating sphere main body, optical filter detector module and photoelectric measurement module; Open two mouths in described integrating sphere main body, reflected light enters the optical filter detector module and photoelectric measurement module that are fixed on integrating sphere body exterior respectively by two openings; Integrating sphere body interior scribbles diffuse reflection coating.
The invention has the beneficial effects as follows: provided by the present invention for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer just trap detector standard and filter radiometer function unite two into one, structure assembly degree is high, small volume and less weight, is suitable as load in-orbit and carries out space radiation calibration.Dual-caliber diaphragm design of the present invention can provide power reference and the conversion between irradiance benchmark and radiation brightness standard.Primary event dividing plate of the present invention coordinates high diffuse reflectance low specular reflectance coating can realize the high lambert homogeneity of incident light at the emergent light of the perforate of photoelectric measurement module and optical filter detector tapping.The present invention adopts unique optical modulator system and Study on Digital Phase Sensitive Detection in photoelectric measurement module, and InGaAs detector has been carried out mechanical refrigeration, under making it be operated in 240K low temperature, finally achieves 10
-13w magnitude, 10
7range of dynamic measurement and minimum measurement power level signal to noise ratio (S/N ratio) can reach the high-precision circuit Measurement and Control System of 400.Coordinate special 15 narrow band pass filters chosen, use smooth interpolation algorithm, optical filter detector in the present invention achieves covering 300 ~ 2500nm sun reflection spectral coverage, and the spectral radiometric calibration of 3 ~ 10nm resolution, reference measurement transmits uncertainty 0.3% level.In sum, involved in the present invention for satellite remote sensor in-orbit the integrating sphere of spectral radiance absolute calibration transmit radiometer there is the ability of low-power signal being carried out to high-acruracy survey, possesses the guarantee of performance long-term stability simultaneously, can be used by space-orbit low temperature radiometer standard of tracing to the source, coordinate feature power reference being converted to the datum tool of radiation brightness standard and the low uncertainty level of high resolving power that possesses of the present invention, solve a difficult problem for SI spectral radiance calibration that the high precision of the satellite remote sensor load such as imaging spectrometer traced to the source in-orbit well.
Accompanying drawing explanation
Fig. 1 is the structural representation of integrating sphere radiometer total system provided by the present invention.
Fig. 2 is the signal measurement control circuit schematic diagram of optical measurement module inside in Fig. 1.
In figure: 1, integrating sphere main body, 2, accurate field stop, 3, first aperture jube, 4, second aperture jube, 5, primary event baffle plate, 6, the perforate of optical filter detector module, 7, the perforate of photoelectric measurement module, 8, diffuse reflection coating, 9, photoelectric measurement encapsulates, 10, optical modulator system, 11, one Silicon and InGaAs detector, 12, first mechanical refrigeration apparatus, 13, signal measurement control circuit, 14, optical filter detector encapsulates, 15, optical filter and alternating apparatus thereof, 16, 2nd Silicon and InGaAs detector, 17, second mechanical refrigeration apparatus.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
See Fig. 1, the present invention relates to a kind of for satellite remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, form primarily of integrating sphere main body, photoelectric measurement module and optical filter detector.
Integrating sphere main body comprises integrating sphere chamber 1, accurate field stop 2, first aperture jube 3, second aperture jube 4, primary event baffle plate 5, optical filter detector module perforate 6, photoelectric measurement module perforate 7, diffuse reflection coating 8.Accurate field stop 2 is assemblied in the porch in integrating sphere chamber 1, and the first aperture jube 3 and the second aperture jube 4 are separately positioned in accurate field stop 2; Primary event baffle plate 5 is arranged on optical filter detector module perforate 6 and between photoelectric measurement module perforate 7 and the first reflection face of incident beam, diffuse reflection coating 8 is evenly distributed on integrating sphere chamber 1 inside surface and the full surface of primary event baffle plate 5.
Photoelectric measurement module comprises photoelectric measurement encapsulation 9, optical modulator system 10, Silicon and InGaAs detector 11, first mechanical refrigeration apparatus 12, signal measurement control circuit 13.Optical modulator system 10 is assembled after being close to photoelectric measurement module perforate 7, one Silicon and InGaAs detector 11 is arranged in the light path of optical modulator system 10, signal measurement control circuit 13 and a Silicon and InGaAs detector 11 together encapsulate, first mechanical refrigeration apparatus 12 is connected with this encapsulation and is assemblied in thereafter, is positioned at the afterbody of photoelectric measurement encapsulation 9.
Optical filter detector module comprises optical filter detector encapsulation 14, optical filter and alternating apparatus 15 thereof, 2nd Silicon and InGaAs detector 16, second mechanical refrigeration apparatus 17. optical filter detector encapsulation 14 is connected with optical filter detector module perforate 6, after optical filter and alternating apparatus 15 thereof are installed on detector module perforate 6, 2nd Silicon and InGaAs detector 16 is arranged in the light path after mating plate after filtration and alternating apparatus 15 thereof, second mechanical refrigeration apparatus 17 is connected with the 2nd Silicon with InGaAs detector 16, be positioned at optical filter detector and encapsulate 14 afterbodys.
When there being light beam to incide in integrating sphere chamber 1 through accurate field stop 2, if light beam not exclusively covers the first aperture jube 3 and the second aperture jube 4, be adopt power reference to trace to the source calibration; If light beam covers the first aperture jube 3 and the second aperture jube 4 completely, be adopt radiation brightness standard to trace to the source calibration; If only cover the first aperture jube 3 and the second aperture jube 4 one of them, then adopt irradiance benchmark to trace to the source calibration.Incident light in integrating sphere chamber 1 after first time diffuse reflection, part reflected light can be blocked by primary event baffle plate 5, avoid directly entering to inject optical filter detector module perforate 6 and photoelectric measurement module perforate 7, like this after the multiple reflections of diffuse reflection coating 8, detector module perforate 6 and photoelectric measurement module perforate 7 will receive the optical radiation of high lambert's property brightness uniformity.As shown in Figure 2, the light of incident light electrical measurement encapsulation 9 will through optical modulator system 10, optical modulator system 10 is made up of photomodulator and frequency generator, the rotational frequency being controlled photomodulator by frequency generator, to the background signal of incident optical signal superposition fixed frequency, is carried out phase-modulation with this.After phase-modulation, light beam reenters and is mapped on a Silicon and InGaAs detector 11, because incident light energy is faint, utilizes prime amplifier to carry out the amplification of appropriateness so that detect to the electric signal produced.Simultaneously because incident light has superposed phase-modulation, so coordinate the reference signal identical with background signal frequency that frequency generator produces, after signal measurement control circuit 13 carries out digital phase sensitivity detection collection to it, the low-down measuring-signal of noise level can be obtained, coordinate the 240K low temperature environment that the first mechanical refrigeration apparatus 12 provides for a Silicon and InGaAs detector 11 again, final realization carries out high-precision explorer response calibration to the faint spectral radiance covering 1100nm ~ 2500nm sun reflection spectral coverage 5 ~ 10nm resolution, detector after utilizing calibration thus can calculate the relative photo radiation value (power) inciding photoelectric measurement module, because optical filter detector module perforate 6 is identical with the perforated area of photoelectric measurement module perforate 7, so the optical radiation value inciding optical filter detector can be determined thus, and then spectral response calibration is carried out to optical filter detector.Detector module perforate 6 receives the even optical radiation identical with photoelectric measurement module perforate 7, incide light mating plate and the alternating apparatus 15 thereof after filtration of optical filter detector encapsulation 14 afterwards, because optical filter constantly substitutes rotation, so obtain wavelength radiation in the corresponding arrowband wavelength band of 15 different passages successively, such quasi-monochromatic light is finally received by the 2nd Silicon and InGaAs detector 16, coordinate the low temperature environment that the second mechanical refrigeration apparatus 17 provides, finally complete the high precision faint light signal collection identical with photoelectricity test module and responsiveness is calibrated, set up the 2nd Silicon and InGaAs detector 16 and the light beam power inciding integrating sphere chamber 1 through accurate field stop 2, mathematical relation between irradiance or spoke brightness absolute value, realize utilizing the integrating sphere radiometer that the present invention relates to trace to the source in-orbit to the spectral radiance of satellite remote sensor and calibrate measurement.Utilizing the solar radiation of same paths to be radiated at needs scaled satellite remote sensor to transmit on radiometer with the integrating sphere of the absolute calibration of spectral radiance in-orbit that the present invention relates to, just can obtain the spectral responsivity in-orbit of satellite remote sensor, make it obtain high-precision SI calibration of tracing to the source and measure.
Integrating sphere for remote sensor spectral radiance absolute calibration in-orbit of the present invention transmit radiometer have high-precision faint optical signal acquisition capacity, non-constant width spectral coverage and accurate measure calibration performance, its structure design characteristic is applicable to arranging in pairs or groups with low temperature radiometer benchmark in-orbit using, and realizes the traced to the source SI spectral radiance absolute calibration work in-orbit under the low uncertain level of satellite remote sensor.
Claims (10)
1. for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, this radiometer comprises: integrating sphere main body, optical filter detector module and photoelectric measurement module; Open two mouths in described integrating sphere main body, reflected light enters the optical filter detector module and photoelectric measurement module that are fixed on integrating sphere body exterior respectively by two openings; Integrating sphere body interior scribbles diffuse reflection coating.
2. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, this radiometer comprises: primary event baffle plate; Described primary event baffle plate is semi-circular, and full surface scribbles diffuse reflection coating; Be positioned at integrating sphere body interior, be arranged on incident light and enter in the middle of the first reflecting surface after integrating sphere body interior and two openings; The diffuse light in the primary event face of making can not be injected in two openings.
3. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, this radiometer comprises: accurate field stop; Accurate field stop is positioned at the light inlet of integrating sphere main body; First aperture jube and the second aperture jube are set in described accurate field stop.
4. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, the opening diameter of described first aperture jube and the second aperture jube is respectively 10mm and 16mm.
5. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, described optical filter detector module comprises: optical filter and alternating apparatus, Silicon and InGaAs detector; After incident light enters optical filter detector module by opening, mating plate and alternating apparatus thereof after filtration, obtains wavelength radiation in the corresponding arrowband wavelength band of different passage successively, is received by Silicon and InGaAs detector.
6. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, described optical filter and alternating apparatus thereof comprise the different narrow band pass filters of 15 centre wavelengths in 300 ~ 2500nm wavelength band, and narrow band pass filter is all arranged on conversion equipment.
7. according to claim 6 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, described 15 filter center Wavelength distribution are: have 6 within the scope of 300 ~ 700nm, there are 5 within the scope of 700nm ~ 1200nm, within the scope of 1200 ~ 2500nm, have 4.
8. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, described photoelectric measurement module comprises: Silicon and InGaAs detector, optical modulator system and signal measurement control circuit; After incident light enters photoelectric measurement module by opening, through the phase-modulation of optical modulator system, gathered by Silicon and InGaAs detector, due to after signal measurement control circuit carries out digital phase sensitivity detection collection to it, obtain the low-down measuring-signal of noise level.
9. according to claim 1,5 or 8 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, in described optical filter detector module and photoelectric measurement module, all comprise mechanical refrigeration apparatus, mechanical refrigeration apparatus is connected with Silicon and InGaAs detector.
10. according to claim 1 for remote sensor in-orbit spectral radiance absolute calibration integrating sphere transmit radiometer, it is characterized in that, the equal diameters of described two openings, it is 25 ° ~ 35 ° that the centre of sphere of center and integrating sphere main body forms angular range.
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| CN112229506A (en) * | 2020-09-22 | 2021-01-15 | 中国科学院空天信息创新研究院 | Laser testing device for myriawatt-level high-power integrating sphere |
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| CN113296165A (en) * | 2021-06-01 | 2021-08-24 | 中国电子科技集团公司第四十一研究所 | Spaceborne ultraviolet-vacuum ultraviolet band transmission radiation standard and method |
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