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.%Based on fiber Bragg grating ( FBG) sensing principle and tunable filter demodulation technol-ogy, a compound measurement system of temperature and strain for engineering application was designed in this paper.The system was constructed by using modularized structure to realize different modules con-figuration depending on the application.14-channel synchronous parallel measurement could be realized, and each channel could connect up to 16 FBG sensors.In other words, there could be 244 FBG sensors working at the same time.Driven adaptive algorithm was proposed to solve the problem of tunable filter wavelength shift, ensuring that the fitting error of wavelength demodulation was less than 1 pm.The sys-tem enjoyed good stability, and its temperature measurement accuracy was less than ±0.5 ℃.The sys-tem proposed in this paper was applied to concrete monitoring and the measurement results verified the feasibility of the system, showing that the system could meet the needs of practical application.
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