基于光纤传感器的固体杨氏模量与泊松比测量方法研究

提出了一种基于光纤传感器的测量固体材料杨氏模量与泊松比的方法,给出了Sagnac光纤干涉仪的环形光纤作为点传感器检测声波及用于声速测量的原理,推导出固体中声波速度与材料的杨氏模量及泊松比的关系式.以光纤Sagnac干涉仪作为传感器贴附于三角铸铁导轨表面,分别测出声表面波与纵波的速度,根据理论推导,得到了铸铁的杨氏模量与泊松比.实验结果与理论数值基本吻合,表明了此测量方法的可行性,为固体材料性能评估提供了一种新的方法.

On the Measurement Of Young's Modulus And Poisson's Ratio For Solids Based On Optical Fiber Sensors

A measurement method of Young's modulus and Poisson's ratio based on optical fiber sensors for solids is proposed in this paper. Principle of taking the ring optical fiber Sagnac interferometer as point sensors used to detect sound waves and measure sound velocity is presented, relationship between the sound velocity and material Young's modulus and Poisson' s ratio in solids was deduced. The surface wave velocity and longitudinal wave velocity were measured in experiment, respectively, by pasting optical fiber Sagnac interferometer on a triangle iron guide as the sensors. Young's modulus and Poisson's ratio of cast-iron were obtained according to above-mentioned theoretical derivation. Experimental results are basically consistent with theoretical value, which indicates the feasibility of this measurement method, and provides a new method for evaluation of solid material performance.