Abstract
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
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