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简要介绍了雪崩光电二极管(APD)阵列光子计数成像原理,建立了基于泊松点过程的APD阵列的单光子响应模型。将由光子数、像素点相关组成的目标图形作为激励源加入到APD阵列的单光子响应模型中去,采用蒙特卡洛仿真方法得到多次门控信号下的目标图像。仿真结果与相同照度下的微光图像的比较证明,采用APD阵列进行光子计数被动成像具有灵敏度高、响应速度快的特点,可以广泛地应用到多个科研领域。但是由于器件恢复时间的限制,该项技术目前还只能应用于主动成像和极微弱光照度条件下的被动成像。
The photon counting imaging principle of avalanche photodiode (APD) array is briefly introduced. The single photon response model of APD array based on Poisson point process is established. Aiming at the single-photon response model of the APD array, a target image composed of photon number and pixel-point correlation is used as an excitation source, and the target image under a plurality of gating signals is obtained by a Monte Carlo simulation method. The simulation results show that the APD array photon counting passive imaging has the characteristics of high sensitivity and fast response, which can be widely applied to many scientific fields. However, due to the limitation of device recovery time, the technology can only be applied to passive imaging under active imaging and extremely weak illumination.