提出了一种利用两种不同温度系数的光纤光栅对来对解调仪的不稳定性进行改进的方法，并进行了理论分析，研究了影响该解调仪稳定性的几个因素。将所研制的传感器布设在东海大桥上，组成传感网络，并用改进后的光纤光栅解调系统对传感器的信号进行解调。在大桥竣工测试时，该传感解调系统表现出较好的性能。

A compensation method with theoretical analysis is proposed to compensate the instability of interrogation by using a pair of fiber Bragg grating (FBG) with different thermal coefficients. The factors that influenced the stability of interrogation had been investigated. Several sensors were installed in Donghai Bridge and formed a sensor network. The signals from sensors were demodulated by the improved interrogator on the final test of Donghai Bridge, which shows good performance.