基于线性啁啾光纤光栅点式横向应力传感研究

量子电子学报 ›› 2019, Vol. 36 ›› Issue (6): 752-758.

• 纤维与波导光学 • 上一篇

基于线性啁啾光纤光栅点式横向应力传感研究

涂兴华,刁俊辉

南京邮电大学电子与光学工程学院光电传感工程研究中心，江苏南京 210023

收稿日期:2019-01-28 修回日期:2019-02-01 出版日期:2019-11-28 发布日期:2019-11-19
通讯作者: 涂兴华 E-mail:tuxh@njupt.edu.cn
作者简介:涂兴华（1976-），安徽阜南人，博士，副教授，主要从事光纤通信器件及光电传感器件等方面的研究。
基金资助:
Supported by National Natural Science Foundation of China (国家自然科学基金，11547031)，Nanjing University of Posts and Telecommunications Science Foundation (南京邮电大学校级科研基金，NY217111)

Study on sensing of transversal strain in small applying scale with linearly chirped fiber bragg grating

TU Xinghua， DIAO Junhui

Research Center of Optoelectronic Sensing Engineering, School of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Received:2019-01-28 Revised:2019-02-01 Published:2019-11-28 Online:2019-11-19

摘要/Abstract

摘要： 线性啁啾光纤光栅受到横向应力作用时会产生轴向展宽。当作用线度即光纤光栅受力区域长度与光纤直径相当时，该展宽不能忽略。基于空间弹性力学受力分析，可得到其轴向展宽导致的相移。该光栅光谱中产生的透射峰位置与该相移的大小和位置有关。同时，横向应力会导致双折射现象。综上所有因素，建立了利用斯托克斯参量（Stokes parameters）实现小线度作用区域即点式横向应变传感的理论模型。计算与实验结果表明：线性啁啾光纤光栅在点式横向应力条件下，应力大小在弹性限度范围内与Stokes-s1参量峰值呈线性变化关系。而Stokes-s1参量谱峰波长与横向应力作用位置相对应，且与应力大小有关。通过分析透射谱的Stokes-s1参量，可实现对横向应力大小和位置的传感。

关键词: 光纤光学, 斯托克斯参量, 光纤布拉格光栅, 横向应力, 传感

Abstract: There is some axial extension in the applying scale of linearly chirped fiber Bragg(LCFBG) with transversal strain. The effect of the axial one should be considered on condition that the length of the applying scale is sharp to the same order of magnitude compared with the diameter of fiber. Based on the analysis method of spatial elasticity, phase shift in the modulated refractive index distribution of LCFBG is obtained because of the axial extension. And a transmission spectrum peak is created which is related to the value and position of phase shift. Furthermore, the radial refractive index of LCFBG is also changed for the birefringence with transversal strain. Considered with the conditions above, the theoretical sensing model of transversal strain in small applying scale that can be treated as a point is introduced, in which the Stokes parameter characteristics of LCFBG are very important and useful. Simulation and analysis results show that the transmission coefficient grows exponentially with transversal strain but the peak value of transmission Stokes parameter spectrum is linearly dependent to the value of transversal strain applying in LCFBG. There is a one-to-one correspondence between the peak wavelength of transmission Stokes-s1 parameter spectrum and the applying position of transversal strain. And the peak wavelength of transmission Stokes-s1 parameter spectrum grows linearly with the value of transversal strain. So the position and value of transversal strain in small applying scale can be converted through the analysis method of measuring the transmission Stokes-s1 parameter spectrum of LCFBG.

Key words: fiber optics, Stokes parameter, fiber Bragg grating, transversal strain, sensing

中图分类号:

TN253

涂兴华刁俊辉. 基于线性啁啾光纤光栅点式横向应力传感研究[J]. 量子电子学报, 2019, 36(6): 752-758.

TU Xinghua, DIAO Junhui. Study on sensing of transversal strain in small applying scale with linearly chirped fiber bragg grating[J]. Chinese Journal of Quantum Electronics, 2019, 36(6): 752-758.

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基于线性啁啾光纤光栅点式横向应力传感研究

Study on sensing of transversal strain in small applying scale with linearly chirped fiber bragg grating

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