Methods of polarimetric calibration and reconstruction for a fieldable channeled dispersive imaging spectropolarimeter

Polarimetric calibration and reconstruction methods for a fieldable channeled dispersive imaging spectropolarimeter (CDISP) are presented. A theoretical model for the polarimetric calibration is derived first. In the polarimetric calibration for the CDISP, the alignment errors of the polarimetric spectral intensity modulation module, and the polarization effects of the optical system and phase factors of the high-order retarders at different viewing angles, are considered and determined independently. Based on the results of the polarimetric calibration, the Stokes vector of the target is reconstructed through the derived reconstruction model. Simulation results with a fieldable CDISP designed for airborne remote sensing indicate that by using the presented polarimetric calibration and reconstruction methods, the measurement accuracy at each viewing angle of the fieldable CDISP can be improved. Experimental results are summarized and analyzed to demonstrate the effectiveness of the presented methods.