Cross-fringe technique for sensing piston errors of segmented mirror telescope

Seichi Sato; Makoto Hirose; Tadahito Mizutani; Toshiyoshi Kimura

doi:10.1117/12.2562116

13 December 2020 Cross-fringe technique for sensing piston errors of segmented mirror telescope

Seichi Sato, Makoto Hirose, Tadahito Mizutani, Toshiyoshi Kimura

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114432L (2020) https://doi.org/10.1117/12.2562116
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

For the disaster prevention and mitigation, large segmented Earth observation telescope in the geostationary orbit is studied in JAXA. In order to obtain diffraction limited performance with the segmented telescope, it is necessary to co-phase the segmented primary mirrors with sub-wavelength accuracy. And since the displacement of the mirrors induced by environmental stress occurs during launching and in orbit, the phasing sensor also need to cover the measurement range exceed tens of micrometers. In this paper, we propose a technique for the purpose and enable us to obtain piston errors of multiple segments simultaneously independent of the edge orientation. The optical scheme for the telescope model is presented and some fundamental experiments are described.

Conference Presentation

Citation Download Citation

Seichi Sato, Makoto Hirose, Tadahito Mizutani, and Toshiyoshi Kimura "Cross-fringe technique for sensing piston errors of segmented mirror telescope", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114432L (13 December 2020); https://doi.org/10.1117/12.2562116

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