CN105157827B - Integrating sphere for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer - Google Patents
Integrating sphere for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer Download PDFInfo
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- CN105157827B CN105157827B CN201510197080.9A CN201510197080A CN105157827B CN 105157827 B CN105157827 B CN 105157827B CN 201510197080 A CN201510197080 A CN 201510197080A CN 105157827 B CN105157827 B CN 105157827B
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Abstract
Integrating sphere transmission radiometer for the in-orbit spectral radiance absolute calibration of satellite remote sensor belongs to the in-orbit spectral radiometric calibration field of remote sensor, and the radiometer includes：Integrating sphere main body, optical filter detector module and photoelectric measurement module；Two mouths are opened in the integrating sphere main body, reflected light respectively enters the optical filter detector module and photoelectric measurement module for being fixed on integrating sphere body exterior by two openings；Integrating sphere body interior scribbles diffusing reflection coating.The present invention has the ability that high-acruracy survey is carried out to low-power signal, it is provided simultaneously with the guarantee of performance steadily in the long term, it can be used by space-orbit low temperature radiometer standard of tracing to the source, coordinate that the present invention possesses the characteristics of power reference to be converted to radiation brightness standard and high-resolution, the datum tool of low uncertainty level, trace to the source to the problem of SI spectral radiance absolute calibration in-orbit to the high accuracy of the satellite remote sensor load such as imaging spectrometer is solved well.
Description
Technical field
The invention belongs to the in-orbit spectral radiometric calibration field of remote sensor, it is related to a kind of for the in-orbit spectrum spoke of satellite remote sensor
Penetrate the integrating sphere transmission radiometer of absolute calibration.
Background technology
As the mankind are to some significant problems such as global warming, high-resolution earth observation, extreme hazard forecastings
Lasting further investigation, the demand that pair can be traced to the source to the high-quality space remote sensing data of unified radiation benchmark is more and more urgent.Due to
Existing satellite optical remote sensing load spectral radiometric calibration lacks high-precision unified radiation benchmark, causes the remote sensing of a large amount of satellites
There is larger measurement error in data so that existing remote sensing satellite is difficult to meet some fields such as weather, resource and environment a large amount of
Science data demand.To meet the Research Requirements to earth climatological observation, various space tasks provide substantial amounts of observation number
According to the quality of data and the reliability and adequacy of announcement precision turn into the key that data are effectively used.But in space service,
Particularly with optical sensor, although the ground calibration means before transmitting are perfect, calibration precision is high, but is due to emission process shake
Decay and drift occur for the influence such as space environment after moving and entering the orbit, in-orbit radiation scale, and the chain fracture of radiation datum tool is caused
Instrument after entering the orbit can not trace to the source to SI (international base unit system --- the international system of units
of measurement).In order to improve In-flight calibration precision, make the one-level mark of its uncertainty level and national measurement laboratory
Quasi- magnitude quite, it is necessary to set up the space-orbit radiation datum tool system for the SI that can strictly trace to the source, thus set up the quality of data and
Data precision control system, specification is carried out from mechanism to remote sensing radiation calibration, it is ensured that all direct acquisition data have
Source output data can be authentic and valid be traceable to SI, with unprecedented in-orbit low uncertainty level, to influence weather
The parameter of change is monitored.Because total solar irradiance and spectral irradiance are regarded as stable in prolonged yardstick
, so using the sun as the radiation source of in-orbit remote sensor, utilization space low temperature radiometer measured it, being consequently formed to trace to the source
SI datum tool system.But it is due to the limitation of space loading volume weight, directly resulting in the solar radiation value of reception has
Limit, when it is applied to arrowband wide spectrum rank, radiation value is very faint, how to be monitored and for remote sensor spectrum
Radiation calibration is key issue.
The content 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-precision
The integrating sphere for the in-orbit spectral radiance absolute calibration of remote sensor of degree measurement transmits radiometer.
The technical proposal for solving the technical problem of the invention is as follows：
Integrating sphere for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, it is characterised in that the radiometer
Including：Integrating sphere main body, optical filter detector module and photoelectric measurement module；Two mouths are opened in the integrating sphere main body, are reflected
Light respectively enters the optical filter detector module and photoelectric measurement module for being fixed on integrating sphere body exterior by two perforates；Product
Bulb separation body interior scribbles diffusing reflection coating.
The beneficial effects of the invention are as follows：Integration provided by the present invention for the in-orbit spectral radiance absolute calibration of remote sensor
Ball transmission radiometer just trap detector standard and filter radiometer function unites two into one, and structure assembly degree is high, compact light
Just, it is suitable as in-orbit load and carries out space radiation calibration.The present invention dual-caliber diaphragm design can provide power reference with
Conversion between irradiation level benchmark and radiation brightness standard.Primary event dividing plate of the present invention coordinates the high low mirror of diffusing reflection rate
Face reflectivity coating can realize incident light in the perforate of photoelectric measurement module and the height of the emergent light of optical filtering film explorer tapping
Lambert's uniformity.The present invention uses unique optical modulator system and Study on Digital Phase Sensitive Detection in photoelectric measurement module, and
InGaAs detectors have been subjected to mechanical refrigeration, it is operated under 240K low temperature, finally realizes 10-13W magnitudes, 107Dynamic
Measurement range and minimum measurement power level signal to noise ratio can reach 400 high-precision circuit Measurement and Control System.Coordinate special choosing
15 narrow band pass filters taken, using smooth interpolation algorithm, the optical filtering film explorer in the present invention realize to covering 300~
The 2500nm sun reflects spectral coverage, the spectral radiometric calibration of 3~10nm resolution ratio, the reference measurement transmission level of uncertainty 0.3%.
In summary, the integrating sphere transmission radiometer tool for the in-orbit spectral radiance absolute calibration of satellite remote sensor involved in the present invention
There is the ability that high-acruracy survey is carried out to low-power signal, be provided simultaneously with the guarantee of performance steadily in the long term, can be space-orbit
Low temperature radiometer standard of tracing to the source is used, and what the cooperation present invention possessed is converted to power reference radiation brightness standard and high-resolution
The characteristics of datum tool of the low uncertainty level of rate, the height to the satellite remote sensor load such as imaging spectrometer is solved well
The problem of the in-orbit SI spectral radiance calibrations of tracing to the source of precision.
Brief description of the drawings
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 theory diagrams inside optical measurement module in Fig. 1.
In figure：1st, integrating sphere main body, 2, accurate field stop, the 3, first aperture jube, the 4, second aperture jube, 5, once
Reflecting curtain, 6, optical filter detector module perforate, 7, photoelectric measurement module perforate, 8, diffusing reflection coating, 9, photoelectric measurement envelope
Dress, 10, optical modulator system, the 11, the first Silicon and InGaAs detectors, the 12, first mechanical refrigeration apparatus, 13, signal surveys
Amount control circuit, 14, the encapsulation of optical filtering film explorer, 15, optical filter and its alternating apparatus, the 16, the 2nd Silicon and InGaAs are visited
Survey device, the 17, second mechanical refrigeration apparatus.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
Referring to Fig. 1, a kind of integrating sphere for the in-orbit spectral radiance absolute calibration of satellite remote sensor of the present invention is passed
Radiometer is passed, is mainly made up of integrating sphere main body, photoelectric measurement module and optical filtering film explorer.
Integrating sphere main body includes integration spherical cavity 1, accurate field stop 2, the first aperture jube 3, the second aperture jube 4, one
Secondary reflection baffle plate 5, optical filter detector module perforate 6, photoelectric measurement module perforate 7, diffusing reflection coating 8.Accurate field stop 2
The porch of integration spherical cavity 1 is assemblied in, the first aperture jube 3 and the second aperture jube 4 are separately positioned on accurate field stop 2
It is interior；Primary event baffle plate 5 is arranged on the of optical filter detector module perforate 6 and photoelectric measurement module perforate 7 and incident beam
Between primary event face, diffusing reflection coating 8 is evenly distributed on the integration inner surface of spherical cavity 1 and the full surface of primary event baffle plate 5.
Photoelectric measurement module includes photoelectric measurement encapsulation 9, optical modulator system 10, the first Silicon and InGaAs detections
Device 11, the first mechanical refrigeration apparatus 12, signal measurement control circuit 13.Optical modulator system 10 is close to photoelectric measurement module perforate
Assembled after 7, the first Silicon and InGaAs detectors 11 are arranged in the light path Jing Guo optical modulator system 10, and signal is surveyed
Amount control circuit 13 and first
Silicon and InGaAs detectors 11 are together encapsulated, and the first mechanical refrigeration apparatus 12 is connected assembling with the encapsulation
In thereafter, 9 afterbody is encapsulated positioned at photoelectric measurement.
Optical filter detector module includes optical filtering film explorer encapsulation 14, optical filter and its alternating apparatus 15, second
Silicon and InGaAs detectors 16, the optical filtering film explorer of the second mechanical refrigeration apparatus 17. encapsulation 14 and optical filtering film explorer mould
Block perforate 6 is connected, and optical filter and its alternating apparatus 15 are installed on after detector module perforate 6, the 2nd Silicon and InGaAs
Detector 16 is arranged in the light path after optical filter and its alternating apparatus 15, the second mechanical refrigeration apparatus 17 and second
Silicon with InGaAs detectors 16 are connected, and 14 afterbodys are encapsulated positioned at optical filtering film explorer.
When there is light beam to be incided by accurate field stop 2 in integration spherical cavity 1, if light beam not exclusively the first hole of covering
The aperture jube 4 of footpath jube 3 and second, is traced to the source calibration using power reference；If the He of the first aperture jube 3 is completely covered in light beam
Second aperture jube 4 is traced to the source calibration using radiation brightness standard；If only covering the first aperture jube 3 and the second aperture jube
4 one of them, then traced to the source calibration using irradiation level benchmark.Incident light is interior after first time diffusing reflection in integration spherical cavity 1, part
Reflected light can be blocked by primary event baffle plate 5, it is to avoid directly incident to enter optical filter detector module perforate 6 and photoelectric measurement mould
Block perforate 7, so after the multiple reflections of diffusing reflection coating 8, detector module perforate 6 and photoelectric measurement module perforate 7 will
The light radiation of high lambert's property brightness uniformity can be received.The center of two perforates and the centre of sphere composition angular range of integrating sphere main body
For 25°~35°.As shown in Fig. 2 optical modulator system 10, optical modulator system will be passed through by injecting the light of photoelectric measurement encapsulation 9
System 10 is made up of optical modulator and frequency generator, and the rotational frequency of optical modulator is controlled come to incident light by frequency generator
The background signal of Signal averaging fixed frequency, phase-modulation is carried out with this.After phase-modulation, light beam is again incident on first
On Silicon and InGaAs detectors 11, because incident light energy is faint, the electric signal of generation is carried out using preamplifier
Appropriate is exaggerated in order to detection.Simultaneously as incident optical superposition phase-modulation, thus coordinate that frequency generator produces with
Background signal frequency identical reference signal, after signal measurement control circuit 13 carries out digital phase sensitivity detection collection to it,
Can obtain the low-down measurement signal of noise level, then coordinate the first mechanical refrigeration apparatus 12 for the first Silicon and
The 240K low temperature environments that InGaAs detectors 11 are provided, it is final realize to covering 1100nm~2500nm sun reflection spectral coverage 5~
The faint spectral radiance of 10nm resolution ratio carries out high-precision explorer response calibration, thus can be with using the detector after calibration
The related light radiation value (power) for inciding photoelectric measurement module is calculated, due to optical filter detector module perforate 6 and photoelectricity
The perforated area of measurement module perforate 7 is identical, so inciding the light radiation value of optical filtering film explorer can thereby determine that, enters
And spectral response calibration is carried out to optical filtering film explorer.Detector module perforate 6 receives identical with the perforate 7 of photoelectric measurement module
Uniform light radiation, incide afterwards optical filtering film explorer encapsulation 14 light pass through optical filter and its alternating apparatus 15, optical filter
And its alternating apparatus is comprising 15 centre wavelengths the different narrow band pass filters in 300~2500nm wavelength bands, narrow-band-filter
Piece is arranged on conversion equipment.15 filter center Wavelength distributions are：There are 6 in the range of 300~700nm, 700nm~
There are 5 in the range of 1200nm, there are 4 in the range of 1200~2500nm.Because optical filter constantly substitutes rotation, so successively
Wavelength radiation in the corresponding arrowband wavelength band of 15 different passages, such quasi-monochromatic light is finally by the 2nd Silicon
Received with InGaAs detectors 16, the low temperature environment for coordinating the second mechanical refrigeration apparatus 17 to provide is finally completed and photoelectricity test
Module identical high accuracy faint light signal collection and its responsiveness calibration, it is established that the 2nd Silicon and InGaAs detectors 16
Closed with inciding the mathematics between light beam power, irradiation level or the spoke brightness absolute value of integration spherical cavity 1 by accurate field stop 2
System, realizes the in-orbit calibration measurement of tracing to the source of the spectral radiance using integrating sphere radiometer of the present invention to satellite remote sensor.Profit
Being radiated at the solar radiation of same paths needs scaled satellite remote sensor and in-orbit spectral radiance of the present invention
On the integrating sphere transmission radiometer of absolute calibration, it is possible to obtain the in-orbit spectral responsivity of satellite remote sensor, it is obtained height
The SI calibration measurements of tracing to the source of precision.
The integrating sphere transmission radiometer for the in-orbit spectral radiance absolute calibration of remote sensor of the present invention has high-precision
Faint optical signal acquisition capacity, the spectral coverage of non-constant width and accurate measurement calibration performance, its structure design characteristic
It is adapted to use with the collocation of in-orbit low temperature radiometer benchmark, realizes the in-orbit light of the SI that traces to the source under the low uncertain level of satellite remote sensor
Spectrum radiation absolute calibration work.
Claims (8)
1. the integrating sphere transmission radiometer for the in-orbit spectral radiance absolute calibration of remote sensor, it is characterised in that the radiometer bag
Include：Integrating sphere main body, optical filter detector module and photoelectric measurement module；Two mouths, reflected light are opened in the integrating sphere main body
The optical filter detector module and photoelectric measurement module for being fixed on integrating sphere body exterior are respectively enterd by two perforates；Integration
Ball body interior scribbles diffusing reflection coating, and the optical filter detector module includes：Optical filter and its alternating apparatus, Silicon
With InGaAs detectors；Incident light is entered after optical filter detector module by perforate, by optical filter and its alternating apparatus, according to
It is secondary to obtain wavelength radiation in the corresponding arrowband wavelength band of different passages, received by Silicon and InGaAs detectors, it is described
Photoelectric measurement module includes：Silicon and InGaAs detectors, optical modulator system and signal measurement control circuit；Incident light
Entered by perforate after photoelectric measurement module, by the phase-modulation of optical modulator system, by Silicon and InGaAs detectors
Collection, due to after signal measurement control circuit carries out digital phase sensitivity detection collection to it, obtaining noise level low-down
Measurement signal.
2. the integrating sphere according to claim 1 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, the radiometer includes：Primary event baffle plate；The primary event baffle plate is semi-circular, and full surface scribbles diffusing reflection
Coating；Positioned at integrating sphere body interior, it is arranged on incident light and is opened into the first reflecting surface after integrating sphere body interior with two
In the middle of hole；Prevent the diffusing reflection light in primary event face from injecting in two perforates.
3. the integrating sphere according to claim 1 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, the radiometer includes：Accurate field stop；Accurate field stop is located at the light inlet of integrating sphere main body；Described
First aperture jube and the second aperture jube are set in accurate field stop.
4. the integrating sphere according to claim 3 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, the opening diameter of first aperture jube and the second aperture jube is respectively 10mm and 16mm.
5. the integrating sphere according to claim 1 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, the optical filter and its alternating apparatus are comprising 15 centre wavelengths the difference in 300~2500nm wavelength bands
Narrow band pass filter, narrow band pass filter is arranged on conversion equipment.
6. the integrating sphere according to claim 5 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, 15 filter center Wavelength distributions are：There are 6,700nm~1200nm scopes in the range of 300~700nm
Inside there are 5, there are 4 in the range of 1200~2500nm.
7. the integrating sphere according to claim 1 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, mechanical refrigeration apparatus, mechanical refrigeration dress is included in the optical filter detector module and photoelectric measurement module
Put and be connected with Silicon and InGaAs detectors.
8. the integrating sphere according to claim 1 for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer, its
It is characterised by, the area equation of described two perforates, center and the centre of sphere composition angular range of integrating sphere main body are 25 °~35 °.
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| JP4400448B2 (en) * | 2004-12-22 | 2010-01-20 | コニカミノルタセンシング株式会社 | Spectral luminance meter calibration method and calibration system operation program |
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| ITRM20090617A1 (en) * | 2009-11-25 | 2011-05-26 | Consiglio Nazionale Ricerche | METHOD AND APPARATUS FOR MEASUREMENTS OF ISOTROPIC LUMINOUS RADIATION OBTAINED FROM LASER SPECTROSCOPY TECHNIQUES, IN PARTICULAR FOR SUBMICRONIC PARTICULATE MEASURES. |
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| CN102486404A (en) * | 2010-12-06 | 2012-06-06 | 中国科学院西安光学精密机械研究所 | Ultraviolet low-light stellar magnitude simulation and stellar magnitude calibration system |
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