基于双光纤光栅的冰压力传感器研究

A Study on Ice-Pressure Sensor Based on Dual FBGs

冰压力是高纬度地区结构的重要荷载,然而传统的基于电阻应变计开发的冰压力传感装置在稳定性与耐久性上遇到难以跨越的难题。光纤光栅是目前在智能材料系统与结构健康监测研究与应用最为广泛的敏感材料之一,具有分布式绝对测量、抗腐蚀能力强等优点。本文基于双光纤光栅应变测量原理,考虑冰压力测试装置的环境条件,设计开发出冰压力传感装置,详细推导和试验验证了该装置的传感特性,并将试验与理论结果进行了对比。研究结果表明该装置具有温度自补偿、测量值与荷载作用点无关、线性度和重复性好、精度较高等优点,具有良好的应用前景。

Ice pressure is one of the most important loads in high-latitude area, It is inevitably a challenge to overcome the problems of stability and durability for the ice-press devices based on the electrical strain gauge. Fiber Bragg grating （FBG） with advantages of quasi-distribution absolute measurement, high corrosion resistance, etc, has become one of the most popular sensing element for intelligent materials system and structural health monitoring. In this paper, a novel ice-pressure sensor based on dual FBGs was developed with consideration of the harsh environment of the sensor. Its sensing properties was theoretically analyzed and tested by experiments, and the results were compared, The research results show that the FBG-based ice-pressure sensor has good linearity, repetition, immunity of temperature changes and loading position. Such kind of FBG-based icepressure sensor shows great prospect for practical applications.