使用高精细度米长光纤法布里-珀罗谐振器的超高分辨率光纤传感
Ultrahigh-Resolution Fiber-Optic Sensing Using a High-Finesse, Meter-Long Fiber Fabry-Perot Resonator
摘要：
超高分辨率光纤传感已被证明与米长，高精细光纤法布里-珀罗干涉仪（FFPI）。大的，环境引起的谐振频率漂移的主要技术挑战是通过锁定询问激光器到一个类似的米长的FFPI，这与FFPI传感器，是热和机械隔离的环境。在1~100 Hz的频率范围内，可实现800 f ε/sqrt（Hz）的标称噪声极限应变分辨率。应变分辨率在1 kHz时进一步提高到75 f ε/sqrt（Hz），在2 kHz时提高到60 f ε/sqrt（Hz），在23 kHz时提高到40 f ε/sqrt（Hz），证明了与诸如π相移和慢光光纤布拉格光栅等成熟技术相当甚至更好的分辨率。分析了现有系统的局限性，提出了改进策略。这项工作为基于长FFPI的超高分辨率光纤传感奠定了可行的道路。
英文摘要：
Ultrahigh-resolution fiber-optic sensing has been demonstrated with a meter-long, high-finesse fiber Fabry-Perot interferometer (FFPI). The main technical challenge of large, environment-induced resonance frequency drift is addressed by locking the interrogation laser to a similar meter-long FFPI, which, along with the FFPI sensor, is thermally and mechanically isolated from the ambient. A nominal, noise-limited strain resolution of 800 fε /sqrt(Hz) has been achieved within 1 to 100 Hz. Strain resolution further improves to 75 fε /sqrt(Hz) at 1 kHz, 60 fε /sqrt(Hz) at 2 kHz and 40 fε /sqrt(Hz) at 23 kHz, demonstrating comparable or even better resolutions than proven techniques such as π-phase-shifted and slow-light fiber Bragg gratings. Limitations of the current system are analyzed and improvement strategies are presented. The work lays out a feasible path toward ultrahigh-resolution fiber-optic sensing based on long FFPIs.
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