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提出了一种对光纤布拉格光栅(FBG)在横向压力负载条件下的谐振波长分裂进行高灵敏检测的方案,并进行了实验研究。采用偏振分束器和偏振无关的光纤迈克耳逊干涉仪组成检测系统,利用相位调制技术,将光纤布拉格光栅的谐振波长分裂的检测转化为相位差的测量,从而大大提高光纤光栅横向压力负载传感的初始分辨率。利用该系统进行横向压力负载传感实验,得到0.025N/mm横向负载初始分辨能力。
A highly sensitive detection scheme of resonant wavelength splitting of fiber Bragg grating (FBG) under transverse pressure loading is proposed and experimentally studied. The polarization beam splitter and the polarization-independent fiber Michelson interferometer are used to form a detection system. The phase modulation technique is used to convert the detection of the resonance wavelength splitting of the fiber Bragg grating into the phase difference measurement, thereby greatly improving the transverse pressure load transfer Sense of the initial resolution. Using this system for horizontal pressure load sensing experiment, the initial resolution of 0.025N / mm transverse load was obtained.