基于LabVIEW的FBG应变解调信号数据采集与处理方法

为了简化光纤布拉格光栅应变测试解调,提出了基于LabVIEW的应变测试系统数据采集软件的构架框架和流程以及数据分析处理软件的流程.首先介绍了光纤布拉格光栅传感器的测试原理,其次结合实际测量情况确定了基于三步移相解调算法的光纤布拉格光栅波长解调方案,对具有周期性的相位进行相位解包,得到实际与应变成线性关系的相位值,最终解算出应变量.最后,采用悬臂梁与电阻应变仪试验进行验证.

Data acquisition and processing of FBG strain signal based on LabVIEW

In order to simplify the fiber Bragg grating strain test demodulation,this paper presents a LabVIEW-based strain test system data acquisition software and data analysis and processing software.Firstly,the test principle of the fiber Bragg grating sensor is introduced.Secondly,the fiber Bragg grating wavelength demodulation scheme based on the three-step phase shift demodulation algorithm is determined according to the actual measurement.The phase unwrapping phase phase is solved and the actual Into a linear relationship between the phase value,the final solution of the strain.Finally,the cantilever beam and resistance strain gauge test to verify.