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Ultrahigh resolution optic fiber strain sensor with a frequency-locked random distributed feedback fiber laser
Optics Letters ( IF 3.1 ) Pub Date : 2018-05-17 , DOI: 10.1364/ol.43.002499
Peide Liu , Wenzhu Huang , Wentao Zhang , Fang Li

This Letter presents an ultrahigh resolution optic fiber strain sensor. A random distributed feedback fiber laser (RDFL) is locked by the proposed frequency-shift Pound–Drever–Hall technique, which tracks the resonant frequency change of a π-phase-shifted fiber Bragg grating. The random distributed feedback for the RDFL gives a Lorentzian envelope over the original laser frequency noise, which can suppress the thermally induced frequency noise. The frequency noise of the laser is reduced from about 100 to 20 Hz/√Hz at 1 kHz. An ultrahigh dynamic strain resolution of 140 /Hz at 1 kHz is achieved.

中文翻译:

带有锁频随机分布反馈光纤激光器的超高分辨率光纤应变传感器

这封信提出了一种超高分辨率的光纤应变传感器。所提出的移频Pound–Drever–Hall技术可锁定随机分布反馈光纤激光器(RDFL),该技术可跟踪光纤的谐振频率变化。π相移光纤布拉格光栅。RDFL的随机分布反馈给出了原始激光频率噪声的洛伦兹包络,从而可以抑制由热引起的频率噪声。激光的频率噪声在1 kHz时从约100 Hz降低到20 Hz /√Hz。超高动态应变分辨率140 /赫兹 1个 千赫 已完成。
更新日期:2018-06-01
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