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本文基于光纤布拉格光栅(fiber Bragg grating,FBG)传感原理和可调谐滤波器解调技术设计了一套可用于工程中温度和应变监测的复合测量系统.对系统进行模块化设计,可根据应用实际情况配置各个模块,能够实现14通道同步并行测量,每通道最多可负载16支FBG传感器,即最多能实现224个待测点的实时同步测量.针对可调谐滤波器输出波长的非线性漂移问题,提出了可调谐滤波器的自适应驱动算法,波长拟合残差小于1 pm,确保系统的测量精度.系统的温度测量精度小于±0.5℃,稳定性良好.将本文系统应用于混凝土监测领域,测量结果验证了其可行性,可以满足实际工程应用的需要.
In this paper, based on fiber Bragg grating (FBG) sensing principle and tunable filter demodulation technology, a set of complex measurement system can be designed for temperature and strain monitoring in engineering.The modular design of the system can be based on the application The actual configuration of the various modules to achieve 14-channel synchronous parallel measurement, each channel can load up to 16 FBG sensor, which can achieve up to 224 points to be measured real-time synchronization measurement for tunable filter output wavelength nonlinear drift , An adaptive driving algorithm of tunable filter is proposed, the residual error of wavelength fitting is less than 1 pm, which ensures the measurement accuracy of the system.The temperature measurement accuracy of the system is less than ± 0.5 ℃ and the stability is good.The system is applied in the field of concrete monitoring , The measurement results verify its feasibility and can meet the needs of practical engineering applications.