The study on the spectral irradiance responsiveness calibration for UV-VUV solar spectrometer

The monitoring of the solar spectral irradiance has important scientific significance and application value. This paper describes the principle, structure and performance of the UV-VUV solar spectrometer. The calibration principle and the calibration method of the spectral irradiance responsiveness are emphatically discussed, based on synchrotron radiation. The spectral irradiance responsiveness calibration of UV-VUV solar spectrometer in the 165 nm-320 nm spectral range is realized under vacuum environment with PTB transfer standard deuterium lamp as standard source. The results of the calibration are achieved, factors affecting the accuracy of the calibration are analyzed. The synthesized uncertainty of the calibration is 5.1 %.