Bending Vector Sensor Based on a Pair of Opposite Tilted Long-Period Fiber Gratings
Bending Vector Sensor Based on a Pair of Opposite Tilted Long-Period Fiber Gratings
复制标题
基于一对相对倾斜长周期光纤光栅的弯曲矢量传感器
DOI：
10.1109/lpt.2016.2636446
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发表时间：
2017-01-15
影响因子：
2.6
通讯作者：
Hu, Wei
中科院分区：
文献类型：
--
作者：
Li, Yan-Ping;Zhang, Wei-Gang;Hu, Wei
提出了一种新型的光纤光栅矢量弯曲传感头。传感头由两个级联的6 °倾斜长周期光纤光栅组成，它们之间的距离为d。该传感器的非对称特性源于两个倾斜的长周期光栅的角度相对放置和非对称曝光的CO2激光脉冲。当传感器头弯曲时，两个选定的倾角彼此相向移动。利用两个下降点之间的时间间隔，提高了曲率测量的灵敏度，进一步降低了温度串扰。在曲率为0.5 ~ 2 m（-1）的范围内，弯曲灵敏度分别为-15.4935和15.2852nm/m（-1）。该传感器的温度灵敏度是普通长周期光纤光栅的三分之一。
A novel optical fiber grating vector bending sensor head is demonstrated. The sensor head is composed by two cascaded 6 degrees tilted long period fiber gratings, which are separated by a distance d. The asymmetric characteristics of the proposed sensor originate from two tilted long period gratings with angles placed oppositely and asymmetric exposure of the CO2 laser pulses. Two selected dips shift toward each other when the sensor head is bent. The interval between the two dips is used for improving the sensitivity of curvature measurement and further decreasing the temperature crosstalk. For the curvature range from 0.5 to 2 m(-1), the bending sensitivities reach -15.4935 and 15.2852 nm/m(-1) for the opposite bending directions. The temperature sensitivity of the sensor is one third of the normal long period fiber grating.