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 working principle leads long period fiber grating (LPFG) more sensitive than fiber Bragg grating (FBG) in sensing areas such as temperature, strain, concentration, bending etc.. LPFG has great potential in the field of sensors. Compared with FBG sensing signal, the signal interrogation of LPFG needs further research to satisfy the LPFG sensing application. The signal interrogation techniques of LPFG are reviewed and analyzed. The methods of using edge-filter, Fabry-Perot (F-P) cavity and arrayed waveguide grating (AWG) to interrogate LPFG sensing signal are analyzed and compared particularly. The approach to interrogate multiplexed sensors based on LPFG is introduced. Summary and expectation of demodulation technique development trend are presented.