Subjects: Astronomy >> Astrophysical processes submitted time 2024-02-28 Cooperative journals: 《Research in Astronomy and Astrophysics》
Abstract: We tested a new model of CMOS detector manufactured by the Gpixel Inc, for potential space astronomical application. In laboratory, we obtain some bias images under the typical application environment. In these bias images, clear random row noise pattern is observed. The row noise also contains some characteristic spatial frequencies. We quantitatively estimated the impact of this feature to photometric measurements, by making simulated images. We compared different bias noise types under strict parameter control. The result shows the row noise will significantly deteriorate the photometric accuracy. It effectively increases the readout noise by a factor of 2–10. However, if it is properly removed, the image quality and photometric accuracy will be significantly improved.
Subjects: Physics >> Nuclear Physics submitted time 2024-02-09
Abstract: An ultrafast framing camera with a pulse-dilation device, a microchannel plate (MCP) imager, and an electronic imaging system were reported. The camera achieved a temporal resolution of 10 ps by using a pulse-dilation device and gated MCP imager, and a spatial resolution of 100 μm by using an electronic imaging system comprising combined magnetic lenses. The spatial resolution characteristics of the camera were studied both theoretically and experimentally. The results showed that the camera with combined magnetic lenses reduced the field curvature and acquired a larger working area. A working area with a diameter of 53 mm was created by applying four magnetic lenses to the camera. Furthermore, the camera was used to detect the X-rays produced by the laser-targeting device. The diagnostic results indicated that the width of the X-ray pulse was approximately 18 ps.