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

Cui Jiwen; Zhao Shiyuan; Yang Di; Ding Zhenyang

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

机译：改善光学频域反射系统中分布式应变测量精度的插值方法研究

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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

机译：我们使用频谱插值技术来提高基于瑞利散射的光学频域反射测量系统的分布式应变测量精度。我们证明应变精度不受时频分析中存在的“不确定性原理”的限制。研究了不同的内插方法，并用于提高互相关的峰值位置的准确性，因此提高了应变的准确性。通过在空间域中窗口数据的一侧填充零的插值，发现在逆快速傅立叶变换之前，发现具有最佳精度。使用这种方法，在不降低空间分辨率的情况下，应变精度和分辨率都得到改善。在21.4m位置为1cm的空间分辨率内的3μmε的菌株，测量不确定性是3.3μmεilon。（c）2018年光学学会

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来源
《Applied optics》 |2018年第6期|共8页
作者
Cui Jiwen; Zhao Shiyuan; Yang Di; Ding Zhenyang;
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Harbin Inst Technol Ctr Ultra Precis Optoelect Instruments Harbin 150080 Heilongjiang Peoples R China;

Harbin Inst Technol Ctr Ultra Precis Optoelect Instruments Harbin 150080 Heilongjiang Peoples R China;

Tianjin Univ Coll Precis Instruments &

Optoelect Engn Tianjin 300072 Peoples R China;

Tianjin Univ Coll Precis Instruments &

Optoelect Engn Tianjin 300072 Peoples R China;

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

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