介绍一种采用啁啾光栅并结合边缘线性滤波解调的FBG应变测量系统.系统中探头以2个光纤布喇格光栅(FBG)的波长差作为传感信息测量等强度悬臂梁的应变,避免了测量过程中温度变化因素对测量结果的影响,并且提高了灵敏度和分辨率.采用啁啾光栅结合长周期光纤光栅边缘线性滤波技术的波长解调方案,理论上证明了该系统的可行性,系统测量范围为0～500 με,在海上开采平台、高层建筑、大型基础构件、桥梁大坝等结构的健康监测中具有一定意义.

In this paper, strain measuring system based on chirped gratings and edge linear filtering demodulation technology is presented. In the system,the probe works with the wavelength difference of two fiber Bragg gratings as sensing information. This can eliminate the temperature influence on measuring result, and enhance the sensitivity and resolution doubly.Demodulation method adopts chirped grating and long period grating edge linear filtering technology. The system whose measuring range is 0～500με,is feasible in theory. The system can be used in monitoring marine platform, skyscraper,large-scale structure and concrete dam.