High accuracy spectroradiometric standard light source based on detector standard
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摘要: 本文在评述低温绝对辐射计和SIRCUS发展的基础上,讨论了基于探测器标准的光谱可调谐自校准标准光源的工作原理、发展与应用前景。在探测器型光谱辐射标准研究方面,工作在液氦温度的低温绝对辐射计不确定度达0.01%。美国国家标准与技术研究院(NIST)建立的均匀光源光谱辐照度和光谱辐亮度响应度定标装置(SIRCUS)采用一系列激光器,由低温绝对辐射计传递的硅陷阱探测器定标,不确定度已达到0.1%,成功应用于空间遥感仪器高精度辐射定标。分析认为,发展中的基于探测器标准的光谱可调谐自校准标准光源,定标精度高,自行校正老化、衰减,保证了定标精度长期稳定。Abstract: In this paper, based on reviewing the developments of absolute cryogenic radiometers and SIRCUS, the operating principle, developments, and application prospects of detector standard based, spectrally tunable, self-calibrated standard light sources are discussed. In detector-based spectroradiometric standards, absolute cryogenic radiometer operated at liquid helium temperature can achieve an uncertainty of 0.01%. The facility for spectral irradiance and radiance responsivity calibrations using uniform sources(SIRCUS) established at National Institute of Standards and Technology(NIST) in the United States, which uses a series of lasers and conducts calibrations with silicon trap detectors calibrated against cryogenic radiometer, has achieved an uncertainty level of 0.1% and has been successfully applied to radiometric calibrations for space remote sensing instruments. Analysis indicates that developing detector standard based, spectrally tunable, self-calibrated standard light source with high calibration accuracy, can self-correct aging and attenuation and ensure the long-term stability of calibration accuracy.
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图 2 冷板及安装在冷板上的主要实验件示意图
Figure 2. Schematic diagram of cold plate and the critical experimental components mounted on the cold plate
图 3 探测器和遮光罩模块示意图
Figure 3. Schematic diagram of the detector module and baffle section
图 4 光谱能量响应度定标链路
Figure 4. Calibration chain for the spectral power responsivity measurements
图 5 可见-近红外光谱比对器装置(Vis/NIR SCF)
Figure 5. Spectral comparator facility from visible to near-infrared(Vis/NIR SCF)
图 8 在SIRCUS使用低温辐射计定标传递标准探测器光路图
Figure 8. Optical configuration for the calibration of the transfer standards with cryogenic radiometer at the SIRCUS facility
图 9 可见工作标准(Vis WS)定标链
Figure 9. Calibration chain for the visible working standards(Vis WS)
图 10 紫外工作标准(UV WS)定标链
Figure 10. Calibration chain for the ultraviolet working standards(UV WS)
图 11 InGaAs工作标准(IGA WS)定标链
Figure 11. Calibration chain for InGaAs working standards(IGA WS)
图 12 1999 InGaAs工作标准(IGA WS)定标链
Figure 12. Calibration chain for InGaAs working standards(IGA WS) in 1999
图 13 NIST光谱功率响应度工作标准相对综合标准不确定度
Figure 13. Relative combined standard uncertainties for NIST spectral power responsivity working standards
图 15 基于探测器标准的绝对光谱可调谐标准光源实验装置
Figure 15. Set-up of absolute spectrum tunable standard light source based on detector standard
图 17 采用CAS光谱仪辐射计测得的窄带和宽带模式下的光谱分布
Figure 17. Measured spectral distribution in narrow-band and broad-band modes using CAS spectrometer radiometer
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