一维PSD瞬态响应特性的有限差分方法研究

基于有限差分方法,提出了一种新的PSD RC网络传输线模型模拟算法.利用该算法,得到了一维PSD在不同光信号激励下,从开始响应到进入稳态后的各个阶段的精确数值解.揭示了PSD电极对不同照射点的起始响应时间的差异正相关于光入射点与PSD几何中心之间的距离.在高速瞬态探测时,PSD器件参数限制了激励光脉冲信号的频率,其最高调制速率为1/(3.75Tc).模拟计算结果证明了PSD稳态位置响应结果与入射光类型和时间无关.

Study of the Transient Response of One-dimensional PSD Based on Finite Difference Method

One dimensional PSD RC transmission-line network model is computed by means of finite difference method and a generalized mathematical model for different kinds of excitationsilluminated on the PSD is developed. Based on these calculations,it is found that the delay time when the electrode begins to response is positively related with the distance between the position where excitations illuminated and the geometrical center of 1D PSD. it is also pointed out that when utilized in high speed transient detection, the upper limit of exciting beam modulation rate is 1/(3.75Tc).Finally,the conclusion that PSD′s position response is barycenter of the excitation beams and not related with the shape and the duration of the excitations is confirmed.