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提高光纤布拉格 (Bragg)光栅传感器响应灵敏度是提高光纤布拉格光栅传感系统检测精度的有效途径之一。基于弹性聚合物材料封装和金属波纹管封装对光纤布拉格光栅应力响应的增敏作用 ,提出了一种新颖的应力响应增敏的高灵敏度光纤布拉格光栅压强传感器模型。推导了该传感器的压强与布拉格波长相对偏移量之间的关系 ,给出了该传感器压强响应灵敏度系数的解析表达式。表明该传感器布拉格波长相对偏移量和压强之间具有良好的线性关系 ,同时也指出通过适当选择弹性体的弹性模量、波纹管弹性系数等特性参数 ,以及它们的尺寸 ,就可以方便地调整该传感器的压强响应灵敏度系数。该传感器压强响应灵敏度系数实验值高达 - 4 35× 10 -9Pa-1( -6 74nm/MPa) ,是裸光纤光栅压强响应灵敏度系数的 2 197倍 ,理论值为 - 4 6× 10 -9Pa-1,实验值与理论值吻合得很好
Improving the sensitivity of fiber Bragg grating sensor is an effective way to improve the detection accuracy of fiber Bragg grating sensing system. Based on the sensitization effect of elastic polymer material encapsulation and metal bellows encapsulation on the stress response of fiber Bragg grating, a novel strain sensitive fiber Bragg grating pressure sensor model with stress sensitivity enhancement was proposed. The relationship between the pressure of the sensor and the relative offset of the Bragg wavelength is deduced, and the analytic expression of the sensitivity coefficient of the pressure response of the sensor is given. The results show that the Bragg wavelength of the sensor has a good linear relationship with the relative displacement and pressure. Meanwhile, it is also pointed out that the sensor can be easily adjusted by properly selecting the elastic modulus of the elastomer, the bellows elasticity coefficient and other characteristic parameters as well as their sizes The sensor’s pressure response sensitivity factor. The sensitivity of the sensor pressure sensitivity experiment up to - 4 35 × 10 -9Pa-1 (-6 74nm / MPa), which is 2 197 times the sensitivity coefficient of the pressure response of the bare fiber grating, the theoretical value of - 4 6 × 10 -9Pa- 1, the experimental value is in good agreement with the theoretical value