Development of  an infrared all-sky camera system for cloud monitoring

Risa Tsutsuki; Shigeyuki Sako; Hidenori Takahashi; Sohei Kondo; Satoshi Takita; Ryou Ohsawa; Jin Beniyama; Takashi Miyata; Takafumi Kamizuka; Ichiro Takahashi

doi:10.1117/12.2628249

29 August 2022 Development of an infrared all-sky camera system for cloud monitoring

Risa Tsutsuki, Shigeyuki Sako, Hidenori Takahashi, Sohei Kondo, Satoshi Takita, Ryou Ohsawa, Jin Beniyama, Takashi Miyata, Takafumi Kamizuka, Ichiro Takahashi

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121848F (2022) https://doi.org/10.1117/12.2628249
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Automatic survey observations require a high-resolution cloud monitor providing areas of clear sky to a telescope system. A wide-field thermal camera is a powerful tool for monitoring a cloud distribution regardless of scattered lights from the Moon and nearby cities. We developed a compact mid-infrared all-sky monitor using a waterproof camera module with a Ge lens and an 80 x 80-pixel Si-bolometer array for wavelengths from 8 to 12 microns and a magnifying mirror with a diameter of 100 mm. The magnifier has a rotationally symmetrical shape with a round-shaped cross-section, which produces a radially reversed all-sky image without a shade of the camera body. The camera system is equipped with image processing software for coordinate transformation and linearization. In long-term test observations at Kiso Observatory, we confirmed that the system obtains frames of the sky every 60 sec with sufficient sensitivity to discriminate between clear and obscured areas.

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Risa Tsutsuki, Shigeyuki Sako, Hidenori Takahashi, Sohei Kondo, Satoshi Takita, Ryou Ohsawa, Jin Beniyama, Takashi Miyata, Takafumi Kamizuka, and Ichiro Takahashi "Development of an infrared all-sky camera system for cloud monitoring", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121848F (29 August 2022); https://doi.org/10.1117/12.2628249

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