光纤布拉格光栅传感探测非周期信号相位解调方法研究  

Research on Phase Demodulation Method for Non-periodic Signal Detection in Fiber Bragg Grating Sensing

作　　者：程小燕 陶灵平 Cheng Xiaoyan;Tao Lingping(Anhui Sanlian University,Hefei 230601,China)

机构地区：[1]安徽三联学院,安徽合肥230601

出　　处：《廊坊师范学院学报（自然科学版）》2024年第4期35-40,共6页Journal of Langfang Normal University(Natural Science Edition)

基　　金：安徽三联学院科研基金项目“夸克物质在强磁场环境下的相变过程研究”(KJZD2024010)。

摘　　要：为实现不同种类复杂的非周期信号解调,提高非周期信号解调的准确性和稳定性,提出光纤布拉格光栅传感探测非周期信号相位解调方法。在研究非周期信号频谱特征的基础上,分析光纤布拉格光栅的传感原理,得出温度传感以及应变传感会引起布拉格波长变化,导致非周期信号相位发生变化,再结合采用非平衡M-Z光纤干涉解调法,解调非周期信号;采用直流相位跟踪零差法,抵消直流零点漂移,无失真地恢复非周期动态信号的原始信号。实验结果表明,光纤布拉格光栅传感和非平衡M-Z干涉仪组合探测非周期信号相位解调具有很高的灵敏度、准确性和稳定性。To demodulate different kinds of complex non-periodic signals and improve the accuracy and stability of nonperiodic signal demodulation,a phase demodulation method for non-periodic signals detected by fiber Bragg grating(FBG)sensors is proposed.On the basis of studying the spectral characteristics of non-periodic signals,the sensing principle of fiber Bragg gratings is analyzed,and it is concluded that temperature sensing and strain sensing can cause changes in Bragg wavelength,resulting in changes in the phase of non-periodic signals.Combined with the use of non-equilibrium M-Z fiber interference demodulation method,non-periodic signals are demodulated;the DC phase tracking zero difference method is adopted to offset the DC zero drift and restore the original signal of non-periodic dynamic signals without distortion.The experimental results show that the combination of fiber Bragg grating sensing and unbalanced M-Z interferometer for detecting nonperiodic signal phase demodulation has high sensitivity,accuracy,and stability.

关 键 词：光纤布拉格光栅 非周期信号 相位解调 非平衡M-Z干涉仪 相位解调 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]