光纤干涉型传感器是由于外界信号作用到干涉仪上,引起干涉信号相位的变化,通过对相位的解调来反应外界信号.介绍了光纤干涉型传感器的结构及其原理,并对各种干涉型传感器的相位调制与解调技术的优缺点进行了分析.

The relationship between FBG’s wavelength change and strain is verified through the experiment of equal intensity beam on the basis of analysis. The techniques of FBG sensor layout is explored. 36 FBG strain sensors and 5 FBG temperature sensors are successfully laid during the monitoring of a built bridge, and the structural state of the bridge is monitored by the sensors. The monitoring results show that the strain of the concrete girder can be monitored conveniently with the laid FBG sensors, which have good sensing capabilities and provide their durability and stability for structural health diagnosis.