Null lenses are designed for testing the oblate elliptical surface that is the third mirror of the off-axis three-mirror anastigmatic camera used for remote sensing. Modifying the conventional autostigmatic and autocollimation types of null lenses yields a mixed-type design that has a small annular flat mirror and high sensitivity. Detailed analyses of the sensitivity of the mixed-type null lens system with changes in each surface parameter are described.
© 2001 Optical Society of America
(120.3620) Instrumentation, measurement, and metrology : Lens system design
(220.1250) Optical design and fabrication : Aspherics
(220.4840) Optical design and fabrication : Testing
(350.6090) Other areas of optics : Space optics
Yeon Soo Kim, Byoung Yoon Kim, and Yun Woo Lee, "Design of Null Lenses for Testing of Elliptical Surfaces," Appl. Opt. 40, 3215-3219 (2001)