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长周期光纤光栅(LPFG)对温度、应变、液体浓度等外界环境变化的敏感度要远高于光纤布拉格光栅(FBG),在传感领域具有广泛的应用前景。然而LPFG的传感信号解调技术尚不成熟,大大制约了LPFG在传感领域的应用。针对现有LPFG传感信号的解调方法进行分析与评述,着重介绍了基于边沿滤波技术、法布里-珀罗(F-P)腔扫描滤波技术和阵列波导光栅(AWG)技术的几种解调方案,并对各个方案在解调精度、速度、成本等方面进行了比较与分析。此外,介绍了实现LPFG复用解调的方法,并在总结已有技术优缺点的基础上对LPFG信号解调技术的发展趋势进行了展望。
The sensitivity of long period fiber grating (LPFG) to temperature, strain, liquid concentration and other external environmental changes is much higher than that of fiber Bragg grating (FBG), which has a wide range of applications in the sensing field. However, LPFG sensing signal demodulation technology is not yet mature, greatly restricted the LPFG sensing applications. In this paper, the demodulation methods of LPFG sensing signals are analyzed and reviewed. Several demodulations based on edge filtering, Fabry-Perot (FP) cavity scanning and arrayed waveguide grating (AWG) techniques are emphatically introduced. Program, and each program in the demodulation accuracy, speed, cost and other aspects were compared and analyzed. In addition, the method to realize LPFG multiplexing demodulation is introduced, and the development trend of LPFG signal demodulation technology is also forecasted on the basis of summarizing the advantages and disadvantages of the prior art.