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着重介绍光位置传感器（ＰＳＤ）的工作原理、主要特性，讨论了它的输出信号解算方法和应用技术关键。根据ＰＳＤ的特点，对其应用方法作了一些探讨。
The working principle and main characteristics of the light position sensor (PSD) are emphatically introduced. The key points of its output signal calculation method and application technology are discussed. According to the characteristics of PSD, some discussions are made on its application method.