位置敏感探测器统一结构模型的分析

Analysis of uniform configuration model of position sensitive detector

基于统一的二阶RC传输线模型结构,推导出一维和二维PSD光生电势的解析解,并进行了仿真分析。仿真结果表明,一维PSD的光生等势线在没有电极的两边界垂直分布,并能够真实探测到光入射位置;而二维PSD的光生电势分布以光源照射位置为中心向四个电极递减,垂直方向互相影响,在给定参数下光的入射位置与真实值相比有60%的误差。PSD统一结构模型的分析方法和仿真结果对计算激励脉冲响应、短脉冲激励的位置精度分析、光生电势分析提供了一个理论指导。

Based on the uniform configuration model for a distribution RC transmission-line approximation, the analytic solutions of photo potential distribution on 1D Position Sensitive Detector (PSD) and 2D PSD surfaces are discussed and corresponding simulations are also performed. Some conclusions show that the photo potentials are vertically distributed in the boundaries without electrodes on the 1D PSD, which can exactly detect the true incident positions of light. While 2D PSD photo potential gradually decreases from the incident position of light to four electrodes and impacts on each other in two vertical directions. For given parameters, the error between the detected position and true incident position is up to 60%. The analysis and simulation results of uniform configuration model of PSD provide an available theoretical reference for the calculation of drive pulse response and the analysis on position precision initiated by short pulse and photo potential distribution.