Based on the summarization of many kinds of conventional bridge structure displacement measurement methods and their limitations,a new technology PSD (Position Sensitive Detector) with non-contact optical measurement system was introduced detailedly in this paper. The dynamic displacement of bridge structure can be measured in real time,and some valuable parameters can also be obtained,such as maximum deflections,vibration characteristics,fundamental frequencies and attenuation coefficients. PSD system is composed of a V-Cam and PSD targets with LED component. PSD targets can be mounted onto the specific test point of bridge structure. The displacement of target can be captured by V-Cam located within an allowable distance. The practical engineering application showed that PSD non-contact optical measurement system could be effectively used in bridge structure displacement measurement.%在总结各种常规桥梁结构位移量测方法及其局限性的基础上，较为详细地介绍了PSD非接触式光学位移量测技术。它可以实时地量测桥梁结构的动态位移，获得最大挠度、各种振动特性、基频和衰减系数等重要参数。PSD测试系统由一台高速摄像仪和若干个带有LED发光元件的标靶组成。标靶安装在桥梁结构上，高速摄像仪在一定距离范围内实时捕捉标靶位移的变化。实际工程应用表明，PSD非接触式光学量测技术可有效地应用于桥梁结构的位移量测中。
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