长周期光纤光栅应变监测信号解调方法研究

为确保获取到的长周期光纤光栅应变监测信号具备更高精度,便于对监测信号分析和处理,需开展对其信号解调方法的设计研究。将AWG(阵列波导光栅)技术应用到解调中,提取光纤光栅应变信号通道,并实现曲线拟合;根据拟合结果,重构长周期光纤光栅波谷光谱曲线;考虑到环境中的温度因素对信号造成的干扰,构建应变交叉敏感融合算法模型,并完成对信号解调补偿。通过实例证明,该解调方法在实际应用中可以有效降低解调误差,并实现对信号时域波形的等比例放大,为监测信号获取提供便利的同时,将信号中的重要数据信息保留,保证了监测信号的高效利用。

In order to obtain the strain monitoring signal of long-period fiber grating with higher precision and facilitate the analysis and processing of the monitoring signal,the demodulation method is designed.The AWG technique is applied to demodulation,the strain signal channel is extracted and the curve fitting is realized,and the wave-trough spectrum curve of long-period fiber grating is reconstructed according to the fitting result Considering the interference of temperature in the environment,the model of strain cross-sensitive fusion algorithm is constructed,and the signal is demodulated and compensated.Through examples,it has been proven that this demodulation method can effectively reduce demodulation errors in practical applications,and realize the proportional amplification of the signal waveform in the time domain,which provides convenience for the acquisition of the monitoring signal,the important data information in the signal is preserved to ensure the efficient use of the monitoring signal.