布拉格光栅应变测试系统的动态标定

为了能够简单精确地标定出Bragg光栅应变测试系统的应变拉伸系数，通过分析测试系统的解调原理，提出了运用陶瓷制动器的逆压电效应标定该系统的方法。对系统的8路应变测试通道进行了标定实验，将每路通道的实验数据进行线性拟合，分别得到了Bragg光栅应变拉伸量与解调信号相位差的关系曲线，从而确定了每路通道的应变拉伸系数，分析表明系数的标定相对误差在0.002 m/（）以内，标定结果具有较高的精度。

Dynamic calibration for Bragg grating strain measurement system

In order to calibrate the strain stretch coefficient of Bragg grating strain measurement system simply and precisely, on the basis of the analysis of the demodulation principle of the measurement system, we proposed the method for using inverse piezoelectric effect of lead zirconate titanate (PZT) to calibrate the system and carried out the calibration experiment on the 8 strain measurement channels. The relationship curves of the strain and the phase difference between demodulation signals were obtained by the linear fitting of the experimental data of each channel,and the strain sensing coefficient of each channel was determined by the relationship curves. Analysis shows that the coefficients of the calibration relative error is within 0.002 m/（）, the results have higher accuracy.