An off-axis four-mirror-anastigmatic telescope is presented here which is composed of two aspheric surfaces and two spherical surfaces. The entrance pupil diameter is 290 mm and the stop is located at the primary mirror. The effective focal length is 900 mm. The strip field of view for the telescope is 15° × 0.2° and if the telescope is launched into an orbit about 400 km altitude, the observed range width will be more than 105 km within a scene without any other auxiliary scanning instrument. The spectral range can be as wide as from visual wave band to infrared wave band in the mirror system. This telescope can be used for environmental monitoring with different detectors whose pixel is adapted to the optical resolution. In this paper, the spectral range is chosen as 3.0 -5.0 μm, and center distance of the pixel is 30 μm. And the image quality is near the diffraction limit.
© 2012 Optical Society of Korea
(080.2740) Geometric optics : Geometric optical design
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(080.4035) Geometric optics : Mirror system design
Original Manuscript: May 31, 2012
Revised Manuscript: July 5, 2012
Manuscript Accepted: July 6, 2012
Published: September 25, 2012
Xing Long Li, Min Xu, Xian Dong Ren, and Yun Tian Pei, "An Optical Design of Off-axis Four-mirror-anastigmatic Telescope for Remote Sensing," J. Opt. Soc. Korea 16, 243-246 (2012)
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