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设计了一种基于机械感生长周期光纤光栅(MI-LPG)的双边缘滤波光纤布拉格光栅(FBG)传感解调方案。采用不同写制参数制作了谐振边带对称交迭,谐振峰值和带宽相同的两个MI-LPG作为滤波器,利用反射FBG信号通过不同光谱特性的滤波器时输出不同光强的比值对数算法确定被测波长。实验表明,本解调方法能够精确、稳定地实现FBG传感信号的解调,动态范围可达5 nm,解调系统线性拟合计算值和光谱仪所测波长值的均方差为6 pm,线性度好,精度高。
A double-edge-filtered fiber Bragg grating (FBG) sensing demodulation scheme based on mechanically induced periodic fiber grating (MI-LPG) was designed. Different logarithmic parameters were used to generate the symmetrical overlap of resonant sidebands, two MI-LPGs with the same resonant peak and the same bandwidth as the filter, and the ratio logarithm algorithm which output different light intensities when the FBG signals pass different spectral characteristics Determine the wavelength under test. Experiments show that the demodulation method can achieve the demodulation of the FBG sensing signal accurately and stably with a dynamic range up to 5 nm. The mean square error of the linear fit of the demodulation system and the wavelength measured by the spectrometer is 6 pm. The linearity Degree is good, high precision.