A Portable Broadband Radiance Source for Ground Validation Sites

Abstract A portable broadband radiance source based on COB-LED has been developed. It was designed to calibrate array spectroradiometers for Ground Validation Sites. The spectral distribution of COB-LED chip was more similar with solar radiance than traditional calibration light source in the wavelength range between 380 nm and 780 nm. The spectral radiance stability of the light source measured under laboratory condition was within 0.1%/h by developing the temperature control system and high-precision portable power supply. The COB-LED-based source was calibrated by Spectral Irradiance Secondary Standard at NIM.