MTF of Line-Array CCD on Detection Performance for Hyperspectral Imager
WANG Chun-hong1, 2, 3,XIANG Yang1*
1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, China 2. Graduate Univeersity of Chinese Academy of Sciences, Beijing 100039, China 3. Suihua University, Suihua 152061, China
Abstract：As an image-spectrum merging technology，hyperspectral imaging has been used in battlefield reconnaissance rapidly．According to the definition of MTF based on contrast, the theoretical model of the MTF of line-array CCD was presented. The effect of the relative position of line-array CCD and input signal on MTF was analyzed. The results indicate that at the frequency-division of Nyquist frequency, the relative position has a strong effect on the MTF, which becomes much stronger with frequency increase, while at other frequency, the effect of the relative position on MTF depends on the percent error |ζ|, e.g. the bigger the value of |ζ|, the weaker the effect of the relative position on MTF. In the frequency range of |ζ|>0.1%, the effect of the relative position on MTF can be ignored. The above conclusions have directive significance in the design of MTF measure system of hyperspectral imager.
