Sub-ppb Methane Detection via EMD-Wavelet Adaptive Thresholding in Wavelength Modulation TDLAS: A Hybrid Denoising Approach for Trace Gas Sensing.

Tong Mu, Xing Tian, Peiren Ni, Shichao Chen, Yanan Cao, Gang Cheng

Abstract read

In one paragraph

Article in Sensors (Basel, Switzerland), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

6 authors.

Tong MuSchool of Artificial Intelligence, Anhui University of Science and Technology, Huainan 232001, China.

Xing TianSchool of Artificial Intelligence, Anhui University of Science and Technology, Huainan 232001, China.

Peiren NiBeijing Research Institute of Telemetry, Beijing 100076, China.

Shichao ChenSchool of Artificial Intelligence, Anhui University of Science and Technology, Huainan 232001, China.

Yanan CaoState Key Laboratory of Digital Intelligent Technology for Unmanned Coal Mining, Anhui University of Science & Technology, Huainan 232001, China.

Gang ChengState Key Laboratory of Digital Intelligent Technology for Unmanned Coal Mining, Anhui University of Science & Technology, Huainan 232001, China.

Funding

National Natural Science Foundation of China 62405006Open Research Grant of Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining EC2021010

6 · The paper itself

Abstract

Wavelength modulation-tunable diode laser absorption spectroscopy (WM-TDLAS) is a critical tool for gas detection. However, noise in second harmonic signals degrades detection performance. This study presents a hybrid denoising algorithm combining Empirical Mode Decomposition (EMD) and wavelet adaptive thresholding to enhance WM-TDLAS performance. The algorithm decomposes raw signals into intrinsic mode functions (IMFs) via EMD, selectively denoises high-frequency IMFs using wavelet thresholding, and reconstructs the signal while preserving spectral features. Simulation and experimental validation using the CH

Indexed as

detection limitEMDsecond harmonic signalswavelet adaptive thresholdingWM-TDLAS

Identifiers

PMID40872028

DOI10.3390/s25165167

PMCPMC12390478

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LicenceCC BY

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.