一种补偿式光纤光栅传感器压力特性研究

Studies on Pressure Sensing Characteristics of a Compounding-Fiber Grating Sensor

提出一种基于高弹聚合物封装、金属膜盒感受联杆传递的组合式光纤Bragg光栅(FBG)压力传感机构,对其压力传感特性进行了理论和实验研究.结果表明,FBG中心反射波长漂移对压力呈现良好的线性响应特性,压力传感灵敏度可达0.57 nm/MPa.将压力测量范围扩展到了0～4 MPa,这一组合传感机构只对压力增敏,对温度量只保持了裸光栅原有灵敏特性.采用精密弹簧补偿了因高弹聚合物材料应变时产生的时滞效应,避免了高弹簧聚合物存在的弹性滞后和后效性,提高了压力测量的重复性和复用性.

A compounding-sensing setup for measuring pressure, which is based on a fiber Bragg grating (FBG) and a precision elastic embedded in a polymer filled metal cylinder to enhance the pressure sensitivity, was studied experimentally and theoretically. The results show that the Bragg wavelength change is linear to the pressure and the measured pressure sensitivity of the fractional change in the Bragg wavelength of new FBG sensor is 0.57 nm&middotMPa-1, and the measure range of the pressure has been expanded to 0-4 MPa. The setup only increased sensitivity of the pressure and held the sensitivity characteristics of a bare FBG, so using precision elastic can compensate the effect of time-lag due to the stress of polymer material and avoid elasticity lag and aftereffect of the sensor.