Trace gas detection system based on multi-reflection differential Helmholtz cell and VMD-airPLS algorithm

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2024-10-03 DOI:10.1016/j.sna.2024.115939

Minghui Liu , Lei Li , Zhechen Fan, Yalan Luo, Shen Tian, Pengbo Chen, Yingying Qiao, Chongxin Shan

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Abstract

In this paper, a photoacoustic spectroscopy sensor based on multi-reflection differential Helmholtz cell and Variational Mode Decomposition-adaptive iteratively reweighted penalized least squares (VMD-airPLS) algorithm is proposed to improve the signal-to-noise ratio (SNR) and reduce the response time of the system. The Helmholtz photoacoustic cell, fabricated from brass, allows multiple reflections of the laser light within its resonant cavity, effectively increasing the gas absorption path by a factor of ∼ 6. The VMD-airPLS algorithm suppresses incoherent noise and slowly varying baseline noise over time. To validate the performance of the system, methane is measured using a laser with a wavelength of 1653.7 nm. Experimental results demonstrate a significant enhancement in the sensitivity of system, up to approximately 2.2 times, and an improvement in the SNR by up to approximately 4.2 times compared to single-pass system. The minimum detection limit for methane is ∼ 96.79 ppb.

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基于多反射差分亥姆霍兹电池和 VMD-airPLS 算法的痕量气体检测系统

本文提出了一种基于多反射差分亥姆霍兹单元和变异模态分解-自适应迭代重权重化最小二乘法（VMD-airPLS）算法的光声光谱传感器，以提高信噪比（SNR）并缩短系统的响应时间。黄铜制成的亥姆霍兹光声电池允许激光在其谐振腔内多次反射，从而有效地将气体吸收路径增加了 ∼ 6 倍。VMD-airPLS 算法可抑制非相干噪声和随时间缓慢变化的基线噪声。为了验证该系统的性能，使用波长为 1653.7 nm 的激光对甲烷进行了测量。实验结果表明，与单通道系统相比，该系统的灵敏度大幅提高，最高可达约 2.2 倍，信噪比最高可达约 4.2 倍。甲烷的最低检测限为 ∼ 96.79 ppb。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...