SVMD-PE-SG for improved QEPAS-based methane concentration detection

IF 6.1 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Measurement Pub Date : 2026-05-05 Epub Date: 2026-02-27 DOI:10.1016/j.measurement.2026.120998

Tingting Zhang, Yefeng Gu, Qinduan Zhang, Yubin Wei, Li Wang, Chunsheng Li, Wei Wang

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引用次数: 0

Abstract

Methane (CH₄) has extensive applications in energy and chemical industries. However, its flammability and greenhouse effects necessitate timely detection of gas leakage for safety and environmental protection. This study presents a novel second harmonic signal denoising method for quartz-enhanced photoacoustic spectroscopy (QEPAS) CH₄ gas sensors. The proposed method integrates successive variational mode decomposition (SVMD), permutation entropy (PE), and Savitzky-Golay (SG) filtering. The methodology involves initial signal decomposition via SVMD, followed by PE threshold implementation to preserve effective signals during reconstruction, and subsequent SG filtering for enhanced denoising. In addition, we develop a parameter optimization approach to determine an appropriate balance parameter

α

for SVMD-based second harmonic signal decomposition. Both simulation and experimental results validate the superior performance of the SVMD-PE-SG method. The approach significantly improved the signal-to-noise ratio (SNR) from 54.58 to 298.49 and the correlation coefficient (R²) from 0.99682 to 0.99922, achieving a minimum detection limit (MDL) of 2.01 ppm for CH₄ gas. Through Allan variance analysis, the MDL reaches 67 ppb when the integration time is 121 s. Implementation of the SVMD-PE-SG algorithm substantially enhanced the detection accuracy of the CH₄-QEPAS gas sensor.

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SVMD-PE-SG用于改进的qepas甲烷浓度检测

甲烷（CH4）在能源和化学工业中有着广泛的应用。然而，其可燃性和温室效应需要及时检测气体泄漏，以确保安全和环保。提出了一种用于石英增强光声光谱（QEPAS） CH4气体传感器的二次谐波信号去噪方法。该方法集成了连续变分模态分解（SVMD）、置换熵（PE）和Savitzky-Golay （SG）滤波。该方法包括通过SVMD进行初始信号分解，然后通过PE阈值实现以在重建过程中保留有效信号，然后进行SG滤波以增强去噪。此外，我们开发了一种参数优化方法来确定合适的平衡参数α，用于基于支持向量机的二次谐波信号分解。仿真和实验结果都验证了svm - pe - sg方法的优越性能。该方法将CH4气体的信噪比（SNR）从54.58提高到298.49，相关系数（R2）从0.99682提高到0.99922，最低检出限（MDL）为2.01 ppm。通过Allan方差分析，当积分时间为121 s时，MDL达到67 ppb。SVMD-PE-SG算法的实现大大提高了CH4-QEPAS气体传感器的检测精度。

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

Measurement 工程技术-工程：综合

CiteScore

10.20

自引率

12.50%

发文量

1589

审稿时长

12.1 months

期刊介绍： Contributions are invited on novel achievements in all fields of measurement and instrumentation science and technology. Authors are encouraged to submit novel material, whose ultimate goal is an advancement in the state of the art of: measurement and metrology fundamentals, sensors, measurement instruments, measurement and estimation techniques, measurement data processing and fusion algorithms, evaluation procedures and methodologies for plants and industrial processes, performance analysis of systems, processes and algorithms, mathematical models for measurement-oriented purposes, distributed measurement systems in a connected world.