Li Zhe, Zhang Yan-Xin, Zhang Wei-Gang, Kong Ling-Xin, Yue Yang, Yan Tie-Yi
Opt Lett. 2020 Sep 15;45(18):4996-4999. doi: 10.1364/OL.401556.
In this Letter, we proposed a super sensitive optic-fiber curvature sensor with ultra-low temperature crosstalk based on Vernier effect and achieved it experimentally. This sensor composes a pair of parallelized 2CFMIs (2-core-fiber Michelson interferometers) in similar lengths, both of which are involved sensing, but there is a rotation angle between their cross-sections. When the rotation angle approaches 180°, the magnification factor for curvature sensitivity is doubled compared with conventional Vernier effect, while for temperature it is always 1. Therefore, advanced curvature sensitivity and abated temperature crosstalk can be realized simultaneously when demodulating Vernier envelops. The experiment results indicate that the curvature sensitivity of this sensor reached 214.533/, and temperature crosstalk was as low as 0.000276/. The fabrication process is extremely flexible and repeatable, and the magnification factor of Vernier effect could be controlled conveniently.
在本信函中，我们基于游标效应提出了一种具有超低温度串扰的超灵敏光纤曲率传感器，并通过实验实现了该传感器。该传感器由一对长度相近的并行2CFMI（双芯光纤迈克尔逊干涉仪）组成，二者均参与传感，但它们的横截面之间存在一个旋转角度。当旋转角度接近180°时，曲率灵敏度的放大倍数相比传统游标效应提高了一倍，而对于温度而言，放大倍数始终为1。因此，在解调游标包络时，可以同时实现高曲率灵敏度和低温度串扰。实验结果表明，该传感器的曲率灵敏度达到214.533/，温度串扰低至0.000276/。其制作工艺极其灵活且可重复，游标效应的放大倍数能够方便地进行控制。
