中文摘要：

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。

英文摘要：

A novel double-edged filter wavelength interrogation scheme for FBGs is designed based on mechanical-induced long period gratings MI-LPGs.Two LPGs,which have symmetrical overlap resonant sideband,the same resonant peak and bandwidth,are fabricated as filters under different parameters.When FBG reflection signals get through different spectral characteristic filters,the demodulation system will output two intensity different lights.Logarithmic algorithm is adopted due to the ratio between the two output lights.Experiments show that FBG sensing signals interrogation can be realized stability and accurately.And the demodulation dynamic range is up to 5 nm.The mean square between demodulation system linear fitting calculated wavelength value and Spectrometer measurement value is 6 pm.Excellent Linearity and high precision of designed system is proved.