一维位置敏感探测器的相位响应特性

Phase Response Characteristics of One-dimensional Position Sensitive Detectors

摘要:

基于位置敏感探测器(PSD)的相位法探测入射光点的原理,利用RC等效模型得到一维PSD两电极输出电流信号的相位和相位差。分析了相位与调制频率和入射光点位置x的关系,并得出相位差在不同调制频率下的响应特性。在一维PSD上的实验测试结果表明,利用相位差测量的线性关系显著,并且随着调制频率的增大测量灵敏度提高。

Abstract:

The phase difference was utilized to detect the position of the incident light on the surface of position sensitive detector (PSD). The photocurrents, phase and difference phase were derived from the RC equivalent transmission model of 1D PSD. For different modulation frequencies, the relations of phase and phase difference with the position x were analyzed. The experimental results show that the linearity is obvious and the sensitivity is raised as the modulation frequency increases, which are consistent with the theoretical result.