Opt Lett. 2023 Jul 1;48(13):3543-3546. doi: 10.1364/OL.489379.
The resonant fiber-optic sensor (RFOS) is well known for its high sensing resolution but usually suffers from high cost and system complexity. In this Letter, we propose an ultra-simple white-light-driven RFOS with a resonant Sagnac interferometer. By superimposing the output of multiple equivalent Sagnac interferometers, the strain signal is amplified during the resonance. A 3 × 3 coupler is employed for demodulation, by which the signal under test can be read out directly without any modulation. With 1 km delay fiber and ultra-simple configuration, a strain resolution of 28 /Hz at 5 kHz is demonstrated in the experiment, which is among the highest, to the best of our knowledge, resolution optical fiber strain sensors.
谐振光纤传感器 (RFOS) 以其高传感分辨率而闻名，但通常存在成本高和系统复杂的问题。在本信中，我们提出了一种超简单的白光驱动 RFOS，采用谐振萨格纳克干涉仪。通过叠加多个等效萨格纳克干涉仪的输出，在共振过程中，应变信号被放大。采用 3×3 耦合器进行解调，无需任何调制即可直接读取被测信号。在实验中，使用 1km 延迟光纤和超简单的配置，实现了 5kHz 时 28 /Hz 的应变分辨率，据我们所知，这是光纤应变传感器中最高的分辨率之一。
