ZHOU Xuan-feng,ZHANG De-feng,WANG Yan-bin,et al.Crosstalk effects of IT-CCD irradiated by laser[J].Optics and Precision Engineering,2021,29(06):1225-1233.
Crosstalk effect is one of the most important jamming phenomena that occurs when a CCD imaging sensor is irradiated by a laser beam. An interline transfer CCD was experimentally irradiated by a 532 nm laser beam. A series of crosstalk phenomena were observed, and the saturation threshold of CCD was calculated to be 0.32 mW/cm
2
. According to the working principle and driving pulse time sequence of an interline transfer CCD, we divided the crosstalk phenomenon into two overflowing processes: overflowing during the integral period and overflowing at the readout transfer moment. Crosstalk images were simulated based on this theory. First, laser intensity distributions on the detector surface were simulated based on the transmission transformation law of Gaussian beam. Then, photo-induced charge distribution was simulated by photoelectric conversion. It was followed by crosstalk charge distribution simulation based on the two overflowing processes. Finally, crosstalk images were obtained by simulating voltage detection and gray quantitative processes. The relative error of simulation was less than 40%, which shows that the simulation results are in good agreement with experimental results.
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