Jun 25 – 29, 2023
Ole-Johan Dahls Hus
Europe/Oslo timezone

P1.24: High-speed Readout System of X-ray CMOS Image Sensor for the Time Domain Astronomy

Jun 26, 2023, 3:12 PM
Ole-Johan Spiseri (Ole-Johan Dahls Hus)

Ole-Johan Spiseri

Ole-Johan Dahls Hus

Ole Johan Dahls Hus - Oslo Science Park Gaustadalléen 23B, 0373 Oslo




We have developed an FPGA-based high-speed readout system for a CMOS image sensor to observe X-ray transients in future satellite missions such as HiZ-GUNDAM. The results of our previous research suggested that the CMOS image sensor has a low-energy X-ray detection capability (0.4–4 keV) and strong radiation tolerance, which satisfy the requirements of the HiZ-GUNDAM mission. However, CMOS sensors typically have small pixel sizes, resulting in large volumes of image data. The GSENSE400BSI we used has 2048 × 2048 pixels, producing 6-Mbyte per frame. These large volumes of the observed raw image data cannot be stored in the satellite bus system. Therefore, only X-ray events are extracted. Furthermore, the readout time of CMOS image sensors is approximately ten times faster than that of X-ray CCDs, thereby requiring faster event extraction. To address this problem, we developed an FPGA-based image signal processing system capable of high-speed X-ray event extraction on-board. The compact design of this system enables it to be mounted on a CubeSat mission, facilitating an early in-orbit operation demonstration. In this paper, we present the results of the performance evaluation tests of the proposed FPGA-based readout system using X-ray irradiation experiments. The results of on-board X-ray event extraction and off-line processing are consistent, validating the functionality of the proposed system.

Primary author


Daisuke Yonetoku (Kanazawa University) Hsien-chieh Shen (Aoyama Gakuin University) Junko Hiraga (Kwansei Gakuin University) Makoto Arimoto Takanori Sakamoto (Aoyama Gakuin University) Tatehiro Mihara (Institute of Physical and Chemical Research) Tatsuya Sawano (Kanazawa University) Yoichi Yatsu (Tokyo Institute of Technology)

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