基于长周期光纤光栅的动态轴向应变传感器  

Dynamic axial strain sensor based on long-period fiber gratings

作　　者：王久玲[1] 饶云江[2] 

机构地区：[1]重庆三峡学院物理与电子工程学院,重庆400044 [2]重庆大学光电工程学院,重庆400030

出　　处：《传感器与微系统》2006年第4期38-40,共3页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(60537040);教育部重点基金资助项目(104210);重庆市自然科学基金资助项目(8415)

摘　　要：基于高频CO2激光脉冲写入的新型长周期光纤光栅(LPFG)独特的弯曲特性,提出了一种新的动态轴向应变传感器设计方法。该方法利用新型LPFG向特定方向弯曲时,谐振峰幅值与波长随光栅弯曲率的改变而灵敏地发生线性改变的特性,将动态轴向应变转化为LPFG弯曲曲率的动态改变进行测量。理论和实验表明:系统最后探测到的交流电压随轴向应变的增加而增大,应变灵敏度可达57.56mV/10-6。在施加频率为300 Hz、其值为0.69×10-6的动态轴向应变时,分辨力可达1.6×10-9/H z,信噪比可达61 dB。该方法可用于制作操作简单、分辨力高,成本低廉的动态轴向应变传感器。A novel dynamic axial strain sensor based on the bend characteristics of novel long-period fiber gratings （LPFG） written by high frequency CO2 laser pulses is proposed. According to the bend characteristics of the novel LPFG that its resonant wavelength and amplitude are sensitive to the bend curvature,the dynamic strain measurement is accomplished by measuring the change of the bend curvature of LPFG. The theory and experimental results show that the AC voltage measured by the detector increasing＇with the dynamic axial strain, strain sensitivity is 57.56 mV/10^-6. Resolution is 1.6×10^-9/√Hz and a SNR is 61 dB under a dynamic axial strain of 0.69 × 10^-6 at 300 Hz. A simple and low cost dynamic axial strain sensor can be presented by this method.

关 键 词：导波光纤光学 光纤传感器 长周期光纤光栅 动态轴向应变 

分 类 号：TN253[电子电信—物理电子学]