Influence of encapsulation structures for embedded fiber-optic Bragg grating sensors on strain measurement

WU Ru-jun; ZHENG Bai-lin; HE Peng-fei; TAN Yue-gang

doi:10.3788/OPE.20142201.0024

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Influence of encapsulation structures for embedded fiber-optic Bragg grating sensors on strain measurement

Modern Applied Optics | 更新时间：2020-08-13

- Influence of encapsulation structures for embedded fiber-optic Bragg grating sensors on strain measurement
- Optics and Precision Engineering Vol. 22, Issue 1, Pages: 24-30(2014)
- 作者机构：
  
  1. 同济大学航空航天与力学学院上海,200092
  2. #br# 2.武汉理工大学机电工程学院,湖北武汉,430070
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142201.0024
  CLC： TN253
- Received：20 May 2013，
  
  Published：15 January 2014
- 稿件说明：
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吴入军, 郑百林, 贺鹏飞等. 埋入式光纤布拉格光栅传感器封装结构对测量应变的影响[J]. 光学精密工程, 2014,22(1): 24-30

WU Ru-jun, ZHENG Bai-lin, HE Peng-fei etc. Influence of encapsulation structures for embedded fiber-optic Bragg grating sensors on strain measurement[J]. Editorial Office of Optics and Precision Engineering, 2014,22(1): 24-30
吴入军, 郑百林, 贺鹏飞等. 埋入式光纤布拉格光栅传感器封装结构对测量应变的影响[J]. 光学精密工程, 2014,22(1): 24-30 DOI： 10.3788/OPE.20142201.0024.

WU Ru-jun, ZHENG Bai-lin, HE Peng-fei etc. Influence of encapsulation structures for embedded fiber-optic Bragg grating sensors on strain measurement[J]. Editorial Office of Optics and Precision Engineering, 2014,22(1): 24-30 DOI： 10.3788/OPE.20142201.0024.

摘要

考虑在实际应变测量中传感器封装形式会影响光纤Bragg光栅测得的应变响应

本文研究了测量应变与实际应变之间的关系。针对埋入式光纤Bragg光栅传感器

建立了应变传递函数

并对传递函数的正确性和各个参数对测量应变的影响进行了研究。首先

根据埋入式光纤Bragg光栅传感器的受力特点

提出了多项式形式的剪应力分布

进一步建立了应变传递函数。然后

利用数值方法和实验对该应变传递函数进行验证。最后

分析了传感器长度、胶结层弹性模量、胶结层厚度对测量应变的影响。计算结果表明:该应变传递函数正确;胶结层厚度越薄

弹性模量越大

越有利于应变传递。该应变传递函数计算误差控制在5%以内

完全满足埋入式光纤Bragg光栅测量精度要求

对其实际应用具有指导意义。

Abstract

As the package structures of a sensor seriously interfere the strain responses measured by a Fiber-optic Bragg Grating(FBG)

this paper focuses on the relationship of measured strain and true strain in the actual measurement. It establishes a strain transfer function for embedded FBG sensors and verifies the validity of the transfer function and the influence of different parameters on the measured strain. Firstly

based on mechanical characteristics of embedded FBG sensors

the shear stress distribution with a form of polynomial is presented

then the strain transfer function is established and verified by taking a numerical method and an experiment. Finally the influence of sensor length

cementation layer modulus and cementation layer thickness on the measured strain is analyzed. Experimental results indicate that the strain transfer function is valid. Moreover

the thinner the cementation thickness and the higner the cementation modulus are

the more convenient the strain transfer is. The strain transfer function satisfies the accuracy requirement of embedded FBG sensors because the calculation error is controlled within 5%

which is considered as a guidance for its practical application.

关键词

Keywords

references

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