On-star calibration method for space modulation type interference spectrum imager

This invention relates to a space modulation interference spectrum image apparatus scaling method, which comprises the following steps: the spectrum curve flat even light source enters the integral ball; the source spectrum curve generates the absorption peaks; it generates the parallel light with certain visual angle through calibration lens system to measure the scaling source spectrum curve by device. The scaling light source generates interference image on the detector array through interference device, Fourier lens, and column prism through spectrum image front lens. It gets the spectrum curve of the scaling source through computer restoring. It compares the spectrum curve with the pre-set spectrum curve to get the needed scaling parameters.