The Use of OLCR Technology for Fiber Bragg grating sensing of distributed non-uniform strains

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The Use of OLCR Technology for Fiber Bragg grating sensing of distributed non-uniform strains

Article | 更新时间：2020-08-12

- The Use of OLCR Technology for Fiber Bragg grating sensing of distributed non-uniform strains
- Optics and Precision Engineering Vol. 18, Issue 1, Pages: 1-8(2010)
- 作者机构：
  
  天津大学2. 天津大学精密测试技术及仪器国家重点实验室3. 天津大学精密仪器与光电子工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：15 June 2009，
  
  Revised：10 July 2009，
  
  Published Online：22 January 2010，
  
  Published：22 January 2010
- 稿件说明：
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沈小燕,林玉池,赵美蓉,王为. OLCR技术实现光纤Bragg光栅分布式非均匀应变测量[J]. 光学精密工程, 2010,18(1):1-8

The Use of OLCR Technology for Fiber Bragg grating sensing of distributed non-uniform strains[J]. Optics and precision engineering, 2010, 18(1): 1-8.
沈小燕,林玉池,赵美蓉,王为. OLCR技术实现光纤Bragg光栅分布式非均匀应变测量[J]. 光学精密工程, 2010,18(1):1-8 DOI：

The Use of OLCR Technology for Fiber Bragg grating sensing of distributed non-uniform strains[J]. Optics and precision engineering, 2010, 18(1): 1-8. DOI：

摘要

FBG测量非均匀轴向应变时，反射波谱形状改变，无法用测量Bragg波长的方法来解调。光学低相干技术（OLCR）是解决这个问题的可靠方法。OLCR测试系统以一套扫描Michelson干涉仪为核心，实现光纤光栅脉冲响应的测量，经傅里叶变换，将脉冲响应转化为失调范围内的频率响应，采用光栅重构技术，获得光栅沿轴向各段的复耦合系数，从而由复耦合系数得到沿轴向各段的Bragg波长。最后根据FBG的传感模型可以获得沿轴向的应变分布。结合一套实用的时分复用OLCR系统，详细论述了OLCR测量方法。该系统用于复合层板Ⅰ型层分断裂试验中FBG应变传感器的测量，得到了断裂过程中的轴向应变分布，结果切实可靠。实验证明OLCR能够很好的实现FBG的复杂应变测量，具有很好的应用前景。

Abstract

The reflectivity spectrum of a fiber Bragg grating (FBG) is out of shape under non-uniform strain loading

so the strain can not be deduced from the shift of Bragg wavelength. The optical low coherence reflectometry (OLCR) technology is supposed to be a reliable method for measuring the non-uniform strain of FBGs. Based on a Michelson interferometer

OLCR system is set to interrogate the time domain pulse response of FBG structure

from which the frequency domain reflection response of FBG is converted by Fourier transform. Then the spatial response of FBG

relevant to Bragg wavelength is reconstructed from lay peeling technology. Thus

the non-uniform strain distribution is calculated from the sensing model of FBG. With an effective OLCR system

the OLCR technology is illustrated in detail. An experiment of composite delamination in modeⅠis conducted

and the non-uniform strain distribution is botained with reliability. The OLCR system demostrates an excellent performance in demodulating the FBG non-uniform strain sensing

having a promising application prospect.

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