Evaluation of large pixel CMOS image sensors for the Tomo-e Gozen wide field camera

Yuto Kojima; Shigeyuki Sako; Ryou Ohsawa; Hidenori Takahashi; Mamoru Doi; Naoto Kobayashi; Tsutomu Aoki; Noriaki Arima; Ko Arimatsu; Makoto Ichiki; Shiro Ikeda; Kota Inooka; Yoshifusa Ita; Toshihiro Kasuga; Mitsuru Kokubo; Masahiro Konishi; Hiroyuki Maehara; Noriyuki Matsunaga; Kazuma Mitsuda; Takashi Miyata; Yuki Mori; Mikio Morii; Tomoki Morokuma; Kentaro Motohara; Yoshikazu Nakada; Shin-Ichiro Okumura; Yuki Sarugaku; Mikiya Sato; Toshikazu Shigeyama; Takao Soyano; Masaomi Tanaka; Ken'ichi Tarusawa; Nozomu Tominaga; Tomonori Totani; Seitaro Urakawa; Fumihiko Usui; Junichi Watanabe; Takuya Yamashita; Makoto Yoshikawa

doi:10.1117/12.2311301

20 July 2018 Evaluation of large pixel CMOS image sensors for the Tomo-e Gozen wide field camera

Yuto Kojima, Shigeyuki Sako, Ryou Ohsawa, Hidenori Takahashi, Mamoru Doi, Naoto Kobayashi, Tsutomu Aoki, Noriaki Arima, Ko Arimatsu, Makoto Ichiki, Shiro Ikeda, Kota Inooka, Yoshifusa Ita, Toshihiro Kasuga, Mitsuru Kokubo, Masahiro Konishi, Hiroyuki Maehara, Noriyuki Matsunaga, Kazuma Mitsuda, Takashi Miyata, Yuki Mori, Mikio Morii, Tomoki Morokuma, Kentaro Motohara, Yoshikazu Nakada, Shin-Ichiro Okumura, Yuki Sarugaku, Mikiya Sato, Toshikazu Shigeyama, Takao Soyano, Masaomi Tanaka, Ken'ichi Tarusawa, Nozomu Tominaga, Tomonori Totani, Seitaro Urakawa, Fumihiko Usui, Junichi Watanabe, Takuya Yamashita, Makoto Yoshikawa

Author Affiliations +

Proceedings Volume 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII; 107091T (2018) https://doi.org/10.1117/12.2311301
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Tomo-e Gozen (Tomo-e) is a wide field optical camera for the Kiso 1.05 m f/3.1 Schmidt telescope operated by the University of Tokyo. Tomo-e is equipped with 84 chips of front-illuminated CMOS image sensors with a microlens array. The field of view is about 20 square degrees and maximum frame rate is 2 fps. The CMOS sensor has 2160x1200 pixels and a size of pixel is 19 microns, which is larger than those of other CMOS sensors. We have evaluated performances of the CMOS sensors installed in Tomo-e. The readout noise is 2.0 e^- in 2 fps operations when an internal amplifier gain is set to 16. The dark current is 0.5 e^-/sec/pix at room temperature, 290K, which is lower than a typical sky background flux in Tomo-e observations, 50 e^-/sec/pix. The efficiency of the camera system peaks at approximately 0.7 in 500 nm.

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Yuto Kojima, Shigeyuki Sako, Ryou Ohsawa, Hidenori Takahashi, Mamoru Doi, Naoto Kobayashi, Tsutomu Aoki, Noriaki Arima, Ko Arimatsu, Makoto Ichiki, Shiro Ikeda, Kota Inooka, Yoshifusa Ita, Toshihiro Kasuga, Mitsuru Kokubo, Masahiro Konishi, Hiroyuki Maehara, Noriyuki Matsunaga, Kazuma Mitsuda, Takashi Miyata, Yuki Mori, Mikio Morii, Tomoki Morokuma, Kentaro Motohara, Yoshikazu Nakada, Shin-Ichiro Okumura, Yuki Sarugaku, Mikiya Sato, Toshikazu Shigeyama, Takao Soyano, Masaomi Tanaka, Ken'ichi Tarusawa, Nozomu Tominaga, Tomonori Totani, Seitaro Urakawa, Fumihiko Usui, Junichi Watanabe, Takuya Yamashita, and Makoto Yoshikawa "Evaluation of large pixel CMOS image sensors for the Tomo-e Gozen wide field camera", Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 107091T (20 July 2018); https://doi.org/10.1117/12.2311301

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