High-accuracy primary and transfer standards for radiometric calibration

The first research and experimental results obtained in China of high-accur acy radiometric calibration based on cryogenic radiometer are reported. Unc ertainties of cryogenic radiometer and trap detectors at 7 wavelengths in t he visible spectrum (488-786 nm) were less than 0.023% and 0.035% respectiv ely which proved the reasonability and possibility of establishing and tran sferring high-accuracy radiometric standards based on detectors.