Proceedings Article | 18 December 2019
KEYWORDS: Imaging systems, Infrared detection, Mirrors, Optical design, Modulation transfer functions, Visible radiation, Infrared radiation, Color imaging, Infrared detectors, Infrared imaging
As the spatial resolution, temporal resolution, and spectral resolution performance of space remote sensing optical systems continue to increase, the demand for performance in large fields of view, large relative apertures, and multiple spectral segments is increasing. Aiming at the requirements above requirements, an off-axis common aperture space remote sensing optical systems was designed whicn is based on PW method and Gaussian formula. The system adopts the combination of off-axis two-mirror, beam splitter and refractive optical system. The relative aperture of the visible spectrum is 1/8, field of view is 0.72°, working band is 450~850nm, the focal length is 320mm, and detector pixel size is 5.5μm×5.5μm; The relative aperture of detection system is 1/8, field of view is 9.8°, working band is 3~5μm, focal length is 80mm, and detector is 17μm×17μm. The modulation transfer function of imaging system is about 0.5 at 90.9lp/mm; energy distribution of detection system is higher than 80% at 34μm, confusion spot size is smaller than 34μm. The PW method is used to solve the structural parameters of the off-axis two-mirror system, zoom-in and zoo-out system are respectively spliced, the front off-axis two mirror system is shared, asemi-reverse and semi-transparent film is placed behind the secondary mirror.The optical system adopts a zoom-in lens group to realize imaging system, and adopts a zoom-out lens group to realize infrared detection system. The spatial remote sensing optical system is combined to meet the requirements, the optical system is small in size, light in weight and compact in structure.
