Investigation of the interpolation method to improve the distributed strain measurement accuracy in optical frequency domain reflectometry systems

被引：46

作者：

Cui, Jiwen ^{[1
]}

Zhao, Shiyuan ^{[1
]}

Yang, Di ^{[2
]}

Ding, Zhenyang ^{[2
]}

机构：

[1] Harbin Inst Technol, Ctr Ultra Precis Optoelect Instruments, Harbin 150080, Heilongjiang, Peoples R China

[2] Tianjin Univ, Coll Precis Instruments & Optoelect Engn, Tianjin 300072, Peoples R China

来源：

APPLIED OPTICS | 2018年 / 57卷 / 06期

基金：

中国国家自然科学基金;

关键词：

FIBER; TEMPERATURE; COMPONENTS;

D O I：

10.1364/AO.57.001424

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We use a spectrum interpolation technique to improve the distributed strain measurement accuracy in a Rayleigh-scatter-based optical frequency domain reflectometry sensing system. We demonstrate that strain accuracy is not limited by the "uncertainty principle" that exists in the time-frequency analysis. Different interpolation methods are investigated and used to improve the accuracy of peak position of the cross-correlation and, therefore, improve the accuracy of the strain. Interpolation implemented by padding zeros on one side of the windowed data in the spatial domain, before the inverse fast Fourier transform, is found to have the best accuracy. Using this method, the strain accuracy and resolution are both improved without decreasing the spatial resolution. The strain of 3 mu epsilon within the spatial resolution of 1 cm at the position of 21.4 m is distinguished, and the measurement uncertainty is 3.3 mu epsilon. (c) 2018 Optical Society of America

引用

页码：1424 / 1431

页数：8

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