二维PSD及其在轴系标高变化测试中的应用

位置敏感探测器件（PSD）具有响应时间短、位置分辨率高、光谱响应范围大等优点。介绍了PSD的结构与工作原理，给出了位置坐标函数表达式和相应的输出信号检测电路框图。探讨了PSD在汽轮发电机组轴系标高变化测试中的应用，分析了影响检测精度的因素，提出了相应的解决办法。试验测试结果表明：基于二维PSD的标高测量系统运行稳定，测试数据可靠。

2D PSD and its application in measurement changes of shafts elevation

Position sensitive detector (PSD) , which has several excellent performances-short response time, high position resolution and large response range of spectrum,is a new type of position sensitive detecting devices. The structure and the operational principle of the PSD are introduced. The expressions of the function of position coordinate and the block diagram of relevant output signal detection circuit are given. The application of PSD in measurement of shafts elevation changes on steam-turbine generator sets is investigated. Not only the factors affecting measurement accuracy are analyzed, but also the solving method is proposed. And an example of detecting elevation is provided. The test results indicate that the elevation measurement system based on 2D PSD is stable and its detecting data is reliable.