Based on spontaneous parametric downconversion process, we propose a novel self-calibration radiometer scheme which can self-calibrate the degradation of its own response and ultimately monitor the fluctuation of a target radiation. Monitor results were independent of its degradation and not linked to the primary standard detector scale. The principle and feasibility of the proposed scheme were verified by observing bromine–tungsten lamp. A relative standard deviation of 0.39 % was obtained for stable bromine–tungsten lamp. Results show that the proposed scheme is advanced of its principle. The proposed scheme could make a significant breakthrough in the self-calibration issue on the space platform.
Radiance transfer standard detector (RTSD) is a trap-based facility used as transfer standard detector for radiance
measurements. In this paper, a RTSD with band-center wavelength of 550nm is calibrated and the result of absolute
spectral radiance responsivity (ASRR) calibration is presented. The relative uncertainty in the absolute spectral radiance
responsivity calibration of the RTSD is less than 8×10<sup>-3</sup>.