Zhu Desheng, Zhao Yuanyang, Tu Yourui, Li Hongtao, Xu Lin, Yu Benli, Lu Liang
Opt Lett. 2021 Jan 1;46(1):114-117. doi: 10.1364/OL.412511.
A fiber autodyne laser feedback displacement sensor based on the effect of the frequency shift is demonstrated. The all-fiber structure enables our system to be easily employed in diverse complex and narrow scenes. By virtue of adopting an ultra-high sensitivity distributed Bragg reflector (DBR) fiber laser as the laser source and the frequency-shift technology to avoid the phenomenon that the measured signal of the low frequency is submerged in the noise, the measurement of the sub-picometer displacement under weak feedback condition has been achieved, which shows a great potential in the field of micro-vibration measurement. Moreover, the proposed system has advantages such as simplicity in system structure, low cost of implementation, and immunity to electromagnetic interference.
展示了一种基于频移效应的光纤自差式激光反馈位移传感器。全光纤结构使我们的系统能够轻松应用于各种复杂和狭窄的场景。通过采用超高灵敏度分布布拉格反射镜（DBR）光纤激光器作为激光源，并利用频移技术避免低频测量信号被噪声淹没的现象，实现了在弱反馈条件下亚皮米位移的测量，这在微振动测量领域显示出巨大潜力。此外，所提出的系统具有系统结构简单、实现成本低和抗电磁干扰等优点。
