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

Mamoru Doi,Ko Arimatsu,Yoshifusa Ita,Mikiya Sato,Ryou Ohsawa,Tsutomu Aoki,Yuto Kojima,Yuki Sarugaku,Naoto Kobayashi,Hiroyuki Maehara,Kentaro Motohara,Fumihiko Usui,Noriaki Arima,Kota Inooka,Noriyuki Matsunaga,Mitsuru Kokubo,Tomoki Morokuma,Shiro Ikeda,Toshihiro Kasuga,Takuya Yamashita,Makoto Yoshikawa,Masaomi Tanaka,Masahiro Konishi,Takao Soyano,Tomonori Totani,Shigeyuki Sako,Nozomu Tominaga,Yuki Mori,Takashi Miyata,Seitaro Urakawa,Toshikazu Shigeyama,Masaaki Ichiki ,J Watanabe ,K Mitsuda ,S Okumura ,M Morii ,H Takahashi ,Y Nakada ,K Tarusawa

doi:10.1117/12.2311301

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

Mamoru Doi, Ko Arimatsu + Show 37 more

https://doi.org/10.1117/12.2311301

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Publication Date: Jul 20, 2018

Citations: 7

Affiliation: The University of Tokyo, Tohoku University, National Astronomical Observatory of Japan, Kyoto Sangyo University, Kyoto University, Japan Science and Technology Agency, Japan Spaceguard Association, The Institute of Statistical Mathematics, Japan Meteorological Agency

#Tomo-e Gozen #CMOS Image + Show 8 more

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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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