Huang Wenzhu, Feng Shengwen, Zhang Wentao, Li Fang
Opt Express. 2016 May 30;24(11):12321-9. doi: 10.1364/OE.24.012321.
We report on a high-resolution static strain sensor developed with distributed feedback (DFB) fiber laser. A reference FBG resonator is used for temperature compensation. Locking another independent fiber laser to the resonator using the Pound-Drever-Hall technique results in a strain power spectral density better than S(f) = (4.6 × 10) ε/Hz in the frequency range from 1 Hz to 1 kHz, corresponding to a minimum dynamic strain resolution of 67.8 pε/√Hz. This frequency stabilized fiber laser is proposed to interrogate the sensing DFB fiber laser by the beat frequency principle. As a reasonable DFB fiber laser setup is realized, a narrow beat frequency line-width of 3.23 kHz and a high beat frequency stability of 0.036 MHz in 15 minutes are obtained in the laboratory test, corresponding to a minimum static strain resolution of 270 pε. This is the first time that a sub-0.5 nε level for static strain measurement using DFB fiber laser is demonstrated.
我们报告了一种采用分布反馈（DFB）光纤激光器开发的高分辨率静态应变传感器。一个参考光纤布拉格光栅（FBG）谐振器用于温度补偿。使用庞德 - 德雷弗 - 霍尔（Pound-Drever-Hall）技术将另一个独立的光纤激光器锁定到该谐振器上，在1 Hz至1 kHz的频率范围内，应变功率谱密度优于S(f) = (4.6 × 10) ε/Hz，对应最小动态应变分辨率为67.8 pε/√Hz。提出利用该频率稳定的光纤激光器通过拍频原理来询问传感DFB光纤激光器。在合理实现DFB光纤激光器设置后，实验室测试中获得了3.23 kHz的窄拍频线宽和15分钟内0.036 MHz的高拍频稳定性，对应最小静态应变分辨率为270 pε。这是首次证明使用DFB光纤激光器进行静态应变测量时达到亚0.5 nε水平。
