A geometric distortion model for multi-element scanning imaging spectrometer: Some primary experimental results

Abstract

Multi-element scanning imaging spectrometer is a typical spectrometer with complex geometrical distortion, which falls in between optical mechanical scanning imaging and push broom imaging. Based on the field imaging spectrometer system (FISS) developed in China, a geometrical distortion model for multi-elements scanning imaging spectrometer is proposed. This model takes into account two main error causes, including scanning mirror's rotation error and tangential projection error, gives their distortion coefficients respectively and final mathematical model. To evaluate the model, an experiment was done by comparing the observed distortion coefficients in FISS image and what predicted by the model. The results indicate that this model is highly consistent with the actual distortion of image and has good precision. The proposed geometric distortion model could be effectively applied not only for the FISS, but also for congeneric multi-element scanning imaging spectrometers.