一维位置敏感探测器的计算机仿真

位置敏感探测器(PSD)是基于PN结横向光电效应的光电器件，其数学模型为Lucovsky方程，通常在二维区域，该方程只在特定条件下可得到解析解。一维PSD具有一定的物理宽度，该宽度对PSD的影响由于受到边界条件限制很难用解析法分析。该文采用偏微分方程求解软件FlexPDE对一维PSD在二维区域内进行了数值仿真，结果表明，宽度较窄的一维PSD其定位误差较宽度大的一维PSD要小，在PSD给定的情况下，光斑在PSD宽度方向上的移动对定位误差基本没有影响。

Computer Simulation of One Dimensional Position Sensitive Detectors

The position sensitive detector(PSD) is a photoelectric sensor based on lateral photoeffect. Its mathematical model is the Lucovsky equation, which has the analytic solution within two-dimensional region under special conditions. Because of the boundary condition limits, the effects of width on the one-dimensional PSD are difficult to be given by utilizing analytic method. This paper provides a numerical method for the one-dimensional PSD by the software FlexPDE. The results indicate that the position error is lower when the width of PSD become narrow, and the variety of irradiated spot in width direction has ultimately no effect on the position error.