Simultaneous Strain and Temperature Measurement Based on Chaotic Brillouin Optical Correlation-Domain Analysis in Large-Effective-Area Fibers

Xiaocheng Zhang,Mingjiang Zhang,Tao Wang,Shuangshuang Liu,Shaohua Gao,Lijun Qiao,Jianzhong Zhang

doi:10.1007/s13320-020-0609-y

Xiaocheng Zhang, Mingjiang Zhang + Show 5 more

Open Access

https://doi.org/10.1007/s13320-020-0609-y

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Journal: Photonic Sensors	Publication Date: Dec 3, 2020
Citations: 5	License type: open-access

Affiliation: Taiyuan University of Technology

Abstract

Chaotic Brillouin optical correlation domain analysis (BOCDA) has been proposed and experimentally demonstrated with the advantage of high spatial resolution. However, it faces the same issue of the temperature and strain cross-sensitivity. In this paper, the simultaneous measurement of temperature and strain can be preliminarily achieved by analyzing the two Brillouin frequencies of the chaotic laser in a large-effective-area fiber (LEAF). A temperature resolution of 1 °C and a strain resolution of 20 µε can be obtained with a spatial resolution of 3.9 cm. The actual temperature and strain measurement errors are 0.37 °C and 10 µε, respectively, which are within the maximum measurement errors.

Highlights

Brillouin optical correlation domain technology has been practically applied in strain monitoring of railways and bridges due to many advantages such as high spatial resolution and high sampling rate [1]
It can be mainly classified into two types: Brillouin optical correlation domain reflectometry (BOCDR) [2, 3] and Brillouin optical correlation domain analysis (BOCDA) [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]
Compared with the BOCDR technology, the BOCDA technology is based on stimulated Brillouin scattering (SBS), making it advantageous over BOCDR for long-range monitoring applications

Summary

Introduction

Brillouin optical correlation domain technology has been practically applied in strain monitoring of railways and bridges due to many advantages such as high spatial resolution and high sampling rate [1]. It can be mainly classified into two types: Brillouin optical correlation domain reflectometry (BOCDR) [2, 3] and Brillouin optical correlation domain analysis (BOCDA) [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. To overcome the trade-off problem, some schemes such as time gating [5] and differential measurement [6]

Methods

Findings

Discussion

Conclusion