光纤布拉格光栅应力传感器

光纤Ｂｒａｇｇ光栅受到一应力梯度作用时，由于光栅的啁啾，使反射频谱不仅偏移，而且发生畸变。本文用散射矩阵公式计算了光纤Ｂｒａｇｇ光栅反射频谱受不同应力梯度作用的影响，并用实验验证了其计算结果。理论分析和实验证明，光纤Ｂｒａｇｇ光栅能方便地测量应力应变的大小分布，并能作为准分布式传感器阵列，对压力的变化进行连续在线实时检测。

OPTICAL FIBER BRAGG GRATING STRAIN SENSOR

When a optical fiber Bragg grating is subject to a strain gradient, it's reflective spectrum will not only be transfered but also be distorted because of the chirp of the grating. We used the T-matrix formalism to calculate the influence of different strain gradients on the reflective spectra of Bragg grating and have undertaken experiments to test these calculations. This confirmed that optical fiber Bragg grating can be used to test strain gradients and can be thought of as quasidistributed strain sensor.