High accuracy spectroradiometric standard light source based on detector standard

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.