针对峰值检测法的不足，提出了频谱相关技术和数字滤波技术，以提高光纤Bragg光栅(FBG)传感系统波长偏移检测精度。分别对峰值检测(CPD)法、数字滤波(CHEBY and IDEAL)法和频谱相关(SC)法检测波长偏移进行了数值模拟，并且搭建了实验系统，对实验数据进行具体分析计算，证实了理论分析的正确性。理论和实验证明， SC法可提高解调检测的精确度，达到理想低通滤波(IDEAL)法的效果。

Because of the imperfections of Conventional Peak Detection (CPD) technique, Spectrum Correlation (SC) and Digital Filter (DF) techniques are proposed, which can be applied to improve the detection precision of the wavelength shift in Fiber Bragg Grating (FBG) sensor systems. Numerical simulations are performed of the wavelength shift detections by CPD, SC and DF (CHEBY and IDEAL) respectively and the experimental results have verified the correctness of the theoretical analysis, which has proved that SC can be used to improve the precision of wavelength shift demodulation and detection up to that by Ideal Low Pass Filter (IDEAL) technique.