基于倾斜少模光纤布拉格光栅的同时测向曲率和温度传感器。

Simultaneous directional curvature and temperature sensor based on a tilted few-mode fiber Bragg grating.

作者信息

Zhao Yunhe, Wang Changle, Yin Guolu, Jiang Biqiang, Zhou Kaiming, Mou Chengbo, Liu Yunqi, Zhang Lin, Wang Tingyun

出版信息

Appl Opt. 2018 Mar 1;57(7):1671-1678. doi: 10.1364/AO.57.001671.

DOI:10.1364/AO.57.001671

PMID:29522018

Abstract

We demonstrate a directional curvature sensor based on tilted few-mode fiber Bragg gratings (FM-FBGs) inscribed by a UV laser. The eigenmodes of LP and LP mode groups are simulated along with the fiber bending. The directional curvature sensor is based on the LP mode resonance in the tilted FM-FBG. For curvature from 4.883 to 7.625 m, the curvature sensitivities at direction of 0° and 90° are measured to be -2.67 and 0.128 dB/m, respectively. The temperature variation barely affects the resonance depth of LP mode. The proposed curvature sensor clearly demonstrates the potential to simultaneous directional curvature and temperature measurement with the resolutions of 9.15×10 m and 0.952°C, respectively.

摘要

我们展示了一种基于紫外激光写入的倾斜少模光纤布拉格光栅（FM-FBG）的定向曲率传感器。模拟了LP和LP模式组的本征模式随光纤弯曲的情况。该定向曲率传感器基于倾斜FM-FBG中的LP模式共振。对于4.883至7.625 m的曲率，在0°和90°方向上测得的曲率灵敏度分别为-2.67和0.128 dB/m。温度变化几乎不影响LP模式的共振深度。所提出的曲率传感器清楚地展示了同时进行定向曲率和温度测量的潜力，分辨率分别为9.15×10 m和0.952°C。