Multi-point calibration method for division-of-amplitude photopolarimetric detection system

Analytical accuracy of polarization remote sensing system is determined by instrumental detection performance. However, it is limited for the instrumental polarization introduced by various factors. In this paper, a multi-point calibration method for measurement matrix of division-of-amplitude (DoA) photopolarimetric detection system had been proposed by analyzing the measurement principle, and the conditions to calibrate a DoA polarization detection system with interval sampling polarization azimuth angle had been derived. Through building a test platform and conducting comparative experiments, the measuring matrix of aviation multi-angular polarimetric radiometer (AMPR) had been determined using the multi-point calibration method mentioned above and the uncertainty had been investigated. The experiment results indicate the measurement error of AMPR is less than 0.5% and corresponding uncertainty is also less than 0.5%, which demonstrate the detection system requirements has been met for AMPR and the feasibility of multi-point calibration method is verified.