双锥形光纤光栅实现温度、折射率和液位同时测量

赵洪霞; 程培红; 丁志群; 鲍吉龙; 蒋鹏; 李银杰

doi:doi:10.3788/cjl201643.1010005

中国激光, 2016, 43 (10): 1010005, 网络出版: 2016-10-12

双锥形光纤光栅实现温度、折射率和液位同时测量下载： 811次

Simultaneous Measurement of Temperature, Refractive Index and Liquid Level Based on Biconical Fiber Gratings

论文大纲

赵洪霞 ^*程培红丁志群鲍吉龙蒋鹏李银杰

作者单位

宁波工程学院电子与信息工程学院, 浙江宁波 315010

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摘要

为了解决光纤光栅传感器同时测量多个参量的难题，结合锥形光纤技术和光纤光栅技术，设计了一款新型双锥形光纤光栅。采用传输矩阵法，借助二层和三层单模光纤纤芯基模有效折射率的色散方程及标量有限元法理论建模，数值分析了均匀腐蚀区直径为3 μm时双锥形光纤光栅的反射谱特性。采用氢氟酸渐变腐蚀法实验制备了双锥形光纤光栅，均匀腐蚀区直径为3 μm时，呈现12个反射峰，2个主峰和10个次峰，与理论分析结果基本吻合。同时选取其中3个反射峰测量了温度、折射率和液位，同步测量灵敏度分别为9.63 nm/℃、1975.96 nm/RIU、26.07 nm/cm。双锥形光纤光栅制作简单，作为传感器可同时测量多个参量，不但能有效降低成本，还能拓宽光纤光栅传感器的设计思路。

Abstract

In order to solve the problem of simultaneous multi-parameter measurement with a fiber optic sensor, we proposed a novel biconical optical fiber grating structure based on combination of the tapered optical fiber and optical fiber grating. The reflection spectral characteristics of the biconical optical fiber grating were analyzed by using the transfer matrix method, the fundamental mode effective refractive index dispersion equation of two- and three-layer single-mode fiber and the scalar finite element method. The reflection spectrum was illustrated when the diameter of uniform erosion region was 3 μm. The hydrofluoric acid etching was used to prepare the biconical fiber Bragg grating. When the diameter of uniform erosion region was 3 μm, 12 reflection peaks including 2 primary peaks and 10 secondary peaks were observed, which is consistent with the theoretical analyses. Furthermore, three of the resonance peaks were selected to test the sensing response to temperature, refractive index and liquid level. The simultaneous detection sensitivity was found to be 9.63 nm/℃, 1975.96 nm/RIU and 26.07 nm/cm, respectively. This biconical fiber grating has a simple fabrication process, it can be used as the multiple-parameter sensors with low cost, and it can also extend the design concept of optical fiber sensor.

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赵洪霞, 程培红, 丁志群, 鲍吉龙, 蒋鹏, 李银杰. 双锥形光纤光栅实现温度、折射率和液位同时测量[J]. 中国激光, 2016, 43(10): 1010005. Zhao Hongxia, Chen Peihong, Ding Zhiqun, Bao Jilong, Jiang Peng, Li Yinjie. Simultaneous Measurement of Temperature, Refractive Index and Liquid Level Based on Biconical Fiber Gratings[J]. Chinese Journal of Lasers, 2016, 43(10): 1010005.

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