Research on differences of AOTF imaging spectrometer spectral calibration results caused by ambient temperature

Abstract

Imaging spectrometer based on acousto-optic tunable filter (AOTF) is widely used in hyperspectral remote sensing at present, however, recently experiment results has shown that changes of environment temperature would cause driving frequencies corresponding different spectral position, result in rising of spectral curve measurement error . In order to make clear changes of AOTF spectral tuning curve under the different environment temperatures, it is necessary to develop an environmental temperature controlled calibration device, and perform plenty spectral calibration under different environment. According to the experiment results, temperature correction is considered in the spectral calibration result. The results show that the spectral characteristics of AOTF imaging spectrometer would be changed by the difference of environmental temperatures. Therefore uncertainty of spectral calibration would be decreased by temperature parameter added into the spectrum of calibration results. Therefore, the outfield measurement error would be decreased and precision of imaging spectrometer spectral measurement would be improved according to this discovery.