Abstract
Optical detectors consist of optical lenses and sensors, which lead to great influence on image quality. The modulation transfer function (MTF) was selected as the image performance index. The influence of focal shift on MTF in optical system was studied and image quality was simulated in this article. The results show that when the focal shift quantity increases, the MTF of detector decreases accordingly, and the high-frequency messages lost gradually. The conclusion is useful for design evaluate optical imaging system.
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