空间调制干涉光谱成像仪不同于其他类型光谱成像仪,其像面上得到一维空间信息和一维光谱信息。由于其原理特殊,定标方法尚不成熟。介绍了一种用于空间调制干涉光谱成像仪光谱辐射度定标的方法,即干涉光谱成像仪和光谱辐射度计同时采集目标辐射强度,复原采集干涉图得到的光谱图,与光谱辐射度计采集绝对光谱进行比对,得到定标系数,并分析了该方法达到的精度。结果表明:该方法可以满足空间调制干涉光谱成像仪光谱辐射度定标的要求,定标精度达到5.74％。

Spatially modulated imaging Fourier transform spectrometer (SMIFTS) was different from other spectrometers. It gained one dimensional spatial information and one dimensional spectral information. Calibration of spatially modulated imaging Fourier transform spectrometer was imperfect for its special theory. A method of radiometric calibration is introduced, which used spatially modulated imaging Fourier transform spectrometer and spectral radiometer to collect irradiance of the same target. After converted interferograms into spectrum and compared with the true spectrum collected by spectial radiometer, calibration coefficients were obtained and the calibration accuracy was analysed. The results indicated that the method can satisfy the requirement of spectral radiometric calibration by spatially modulated imaging Fourier transform spectrometer, the calibration accuracy reached 5.74％.