Yeon Soo KIM¹, Byoung Yoon KIM² and Yun Woo LEE³

¹Agency for Defence Development, Taejon 305-600, Korea ²Department of Physics, Korea Advanced Institute of Science and Technology, Korea ³Korea Research Institute of Standards and Science, Taejon 305-600, Korea

(Received February 12, 2002; Accepted March 11, 2002)

Both the autostigmatic and the mixed type of null lenses are designed for testing the hyperbolic surface of the primary mirror of the off-axis three mirror anastigmat camera for remote sensing. Through comparison of the sensitivity with respect to the change of lens surface parameters, a more suitable type of null lens for testing the hyperbolic surface is presented.

Key words: null lens, design, testing, hyperbolic surface, sensitivity