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提出了一种可用于振动检测的新型光纤光栅传感技术.用偏振控制器和高双折射保偏光纤构建成Sagnac环,结合掺铒光纤、单模光纤和隔离器,形成了单波长光纤激光器,由粘有光纤Bragg光栅的悬臂梁作为传感探头,并利用sagnac环本身的线性边缘,解调振动信号.阐述了sagnac环原理及其产生的边缘效应,并进行了数值模拟计算,对振动信号进行了检测实验,检测系统从L_1到L_l+L_2之间对应的周期可调,灵敏度高达38.2uW/nm,线性度为0.9996,动态范围在40-70 dB,可满足振动传感检测的技术参数要求.
A novel fiber grating sensing technique for vibration detection is proposed.The Sagnac ring is constructed by using a polarization controller and a high birefringence polarization maintaining fiber and combines with erbium doped fiber, single mode fiber and isolator to form a single wavelength fiber laser , The cantilever beam with fiber Bragg grating is used as the sensing probe, and the vibration signal is demodulated by using the linear edge of the sagnac ring itself.The sagnac ring principle and its edge effect are explained and the numerical simulation is carried out. The experimental results show that the detection system has the adjustable period from L_1 to L_1 + L_2, the sensitivity is up to 38.2uW / nm, the linearity is 0.9996 and the dynamic range is 40-70 dB, which can meet the requirement of vibration sensing technology Parameter requirements.