Abstract: The key parameter which describes the spatial resolution of imaging spectrum system is the modulation transfer function (MTF), it is an old and difficult topic to measure the MTF. Under the input scenery with finite visual field, the analyses and simulative calculation of the image-side OTF of vertical direction of the scanning image by moving blade have been done firstly.

Key words: method of moving blade, image-side MTF, imaging spectrum system, optical disturbance