安装偏差对光纤布喇格光栅应变测量的影响

通过理论推导和试验分析研究了安装偏差对光纤应变测量的影响，得到安装误差所带来测量误差的计算公式.发现光纤的轴向与预定安装方向的角偏差越大，测量误差也越大.用光纤光栅进行应变测量时，必须考虑光纤的安装偏差，它直接关系到测量结果的准确性.实际测量中要尽量确保传感器安装方位的准确.

Impact on Strain Measurement by Fiber Bragg Grating of Error of Installation

The strain measurement by the fiber Bragg grating (FBG) is achieved by the Bragg wavelength change when the FBG receives axial strain. But,because of the transverse effect,the FBG' s position of installation will affect the result of the measurement,and the error of the installation will bring the error of the measurement. This paper receives the formula of the error which comes from the error of the installation through theoretical analysis. When the angle has existed in the axial of the optic fibre and installation positions needed,the greater the angle is,the greater the error is. The accuracy of installing position of optic fibre is very important,it concerns directly the accuracy of the measurement's result.