基于信号自相关原理的光纤光栅数字解调方法

为满足工程测试领域对光纤光栅波长漂移高分辨探测技术的需要,提出一种基于信号自相关原理的新型光纤光栅数字解调技术.该技术在可调谐滤波法的基础上,通过对信号序列采用自相关分析以实现对波长漂移的测量以及对传感光栅反射谱形状的识别,能够有效克服噪音对信号的影响.仿真结果表明：光纤光栅自相关数字解调方法可以准确测量光纤光栅波长的漂移,适用于传感光栅具有相同波长的变化范围.

Digital Demodulation Method for Fiber Bragg Grating Sensors Based on Signal Autocorrelation Principle

In order to detect the wavelength drift of Fiber Bragg Grating (FBG) sensors used in engineering with high resolution,a new digital demodulation method based on signal autocorrelation principle is proposed.By autocorrelation analysis of signal sequence,the digital demodulation method developed from the matched filtering method overcome the influence of noise while realize high precision detection of wavelength drift.And,this method also has quick scan speed and powerful multiplexing capability by recognize the reflection spectrum of FBG sensors.The numerical simulation results indicate that the digital demodulation method can detect the wavelength drift accurately while the FBG sensors have different range,and can be used while the FBG sensors have same range.