VHRSR's optical system

Qinbo Zheng

doi:10.1117/12.2294688

1 July 1990 VHRSR's optical system

Qinbo Zheng

Proceedings Volume 1230, International Conference on Optoelectronic Science and Engineering '90; 12301F (1990) https://doi.org/10.1117/12.2294688
Event: The Marketplace for Industrial Lasers 1990, 1990, Chicago, IL, United States

Abstract

VHRSR's optical system is one of key parts of the remote sensors on FY-1 Meteosat. Its main purposed are: a. to receive and focus the radiation from the Earth; b. to form multichannel detection and define its spectral band with splitters / filters; c. to determine IFOV of the instrument and register fields of view of the channels; d. to assure the high imaging quality so as to have more than 0. 3 MTF each channel; e. to perform radiation calibration and determine dynamic range; f. to provide mechanical tolerances to meet optical imaging requirement; g. not to change imaging quality after launch and during operation at space. Radiation from the Earth enters telescope that consists of primary mirror and secondary mirror, of which the axis is tilted 45 degrees with scanning mirror. Exit radiation from telescope is parallel to entrance radiation. IR / visible dichroic beamsplitter divides rays into two parts. IR radiation reflected is focused by a Germanium lens on Mercury Cadmium Tellurium (MCT) detector, which works at 105 Kelvin. Lens and MCT are in a radiant cooler. Visible / near IR radiation transmitted is split into other two rays by a visible / N-IR beamsplitter. Transmitted radiation is focused on the field stop of channel 2 then projected on Si-detector. And reflected radiation is focused on Three-element linear array Si-detector by bi-separate lenses. Three channel micro- filters are near the linear array detector. Before launch, VHRSR designed and installed elaborately underwent many tests and accurate radiation calibration. FY-1 Meteosat was launched successfully on the 7th of Sept. ,1988 in China. High quality pictures of 5 channels were acquired by local stations or central station. It is proved that the quality of VHRSR's optics is excellent and satisfied with the harsh requirements of space engineering.

Citation Download Citation

Qinbo Zheng "VHRSR's optical system", Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12301F (1 July 1990); https://doi.org/10.1117/12.2294688

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