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

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

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.

[1] Mamoru Doi,et al. The Tomo-e Gozen wide field CMOS camera for the Kiso Schmidt telescope , 2018, Astronomical Telescopes + Instrumentation.

[2] J.Lee,et al. THE DARK ENERGY CAMERA , 2004, The Dark Energy Survey.

[3] Mamoru Doi,et al. Kiso Supernova Survey (KISS): Survey Strategy , 2014, 1409.1308.

[4] Larry Denneau,et al. The Pan-STARRS wide-field optical/NIR imaging survey , 2010, Astronomical Telescopes + Instrumentation.

[5] Craig Loomis,et al. Hyper Suprime-Cam , 2012, Other Conferences.

[6] Mamoru Doi,et al. KWFC: four square degrees camera for the Kiso Schmidt Telescope , 2012, Other Conferences.

[7] Michael Porter,et al. The Zwicky Transient Facility Camera , 2016, Astronomical Telescopes + Instrumentation.

[8] Michael Shao,et al. Detection of a Faint Fast-moving Near-Earth Asteroid Using the Synthetic Tracking Technique , 2014 .

[9] Kazuma Mitsuda,et al. Development of a prototype of the Tomo-e Gozen wide-field CMOS camera , 2016, Astronomical Telescopes + Instrumentation.

[10] Zeljko Ivezic. Opportunities and challenges for time domain astronomy with LSST , 2014 .

[11] Mamoru Doi,et al. PHOTOMETRIC RESPONSE FUNCTIONS OF THE SLOAN DIGITAL SKY SURVEY IMAGER , 2010, 1002.3701.

[12] Kazuma Mitsuda,et al. Development of a real-time data processing system for a prototype of the Tomo-e Gozen wide field CMOS camera , 2016, Astronomical Telescopes + Instrumentation.