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设计了一种基于可调谐滤波器的高精度宽量程光纤布拉格光栅(FBG)传感解调系统,通过动态跟踪与锁定的方法将法布里-珀罗可调谐滤波器(FFP-TF)的输出激光锁定在传感光栅反射谱的-3dB处,利用对温度不敏感的标准具对光栅反射波长进行校准,再通过插值拟合算法实现传感光栅中心波长的实时高精度解调。该解调系统解决了基于光学滤波器光栅解调系统所存在的精度与测量范围之间相互制约的矛盾。实验结果表明系统的静态波长漂移量在较宽的测量范围内为2pm,多项式拟合精度达0.998。
A high-precision wide-range fiber Bragg grating (FBG) sensing and demodulation system based on tunable filter was designed. By using dynamic tracking and locking method, the Fabry-Perot tunable filter (FFP-TF) The output laser is locked at -3 dB of the reflection spectrum of the sensing grating. The grating reflection wavelength is calibrated by using an etalon which is insensitive to temperature. Real-time high-precision demodulation of the center wavelength of the sensing grating is realized by the interpolation fitting algorithm. The demodulation system solves the contradiction between the precision and measurement range based on the optical filter grating demodulation system. Experimental results show that the system of static wavelength drift in a wide range of measurement 2pm, polynomial fitting accuracy of 0.998.