A Refinement of Backward Correlation Technique for Precise Brillouin Frequency Shift Extraction

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fibers Pub Date : 2023-06-12 DOI:10.3390/fib11060051

F. Barkov, A. Krivosheev, Y. Konstantinov, A. R. Davydov

引用次数: 1

Abstract

A new method for extracting the Brillouin frequency shift (BFS) from the Brillouin gain spectrum (BGS), the modified backward correlation method (MBWC), is presented. The possibilities of using MBWC, and MBWC in combination with the Lorentzian curve fitting (LCF) based on Levenberg–Marquardt (LM) method, are studied. The effectiveness of the new method, and its combination with LM, has been demonstrated for processing spectra with a low signal-to-noise ratio (SNR). The experiments, which were in good agreement with the performed simulation, showed that at SNR = 0 dB, the combined (MBWC + LM) method provided the BFS extraction error of less than 4 MHz, while the state-of-the-art LM algorithm extracted it with the error greater than 4.5 MHz. The advantage of correlation methods becomes more significant with the decreasing SNR: at SNR = −2 dB, the LM’s error is 14.3 MHz, and that of the combined one is 8.1 MHz.

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精确提取布里渊频移的一种改进后向相关技术

提出了一种从布里渊增益谱(BGS)中提取布里渊频移(BFS)的新方法——改进后向相关法(MBWC)。研究了MBWC与基于Levenberg-Marquardt (LM)方法的Lorentzian曲线拟合(LCF)相结合的可能性。新方法及其与LM的结合在处理低信噪比(SNR)光谱方面的有效性已得到证明。实验结果表明，在信噪比为0 dB时，MBWC + LM联合算法提取的BFS误差小于4 MHz，而LM算法提取的BFS误差大于4.5 MHz。随着信噪比的降低，相关方法的优势更加明显，在信噪比= - 2 dB时，LM的误差为14.3 MHz，组合LM的误差为8.1 MHz。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fibers Engineering-Civil and Structural Engineering

CiteScore

7.00

自引率

7.70%

发文量

审稿时长

11 weeks

期刊介绍： Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins