Dual-Gas Sensor Employing Wavelength-Stabilized Tunable Diode Laser Absorption Spectroscopy and H-Infinity Filtering Algorithm.

IF 2.2 3区化学 Q2 INSTRUMENTS & INSTRUMENTATION Applied Spectroscopy Pub Date : 2025-08-01 Epub Date: 2025-01-10 DOI:10.1177/00037028241310463

Dingli Xu, Qiannan Cai, Gang Zhang, Qiang Ge, Linguang Xu

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Abstract

A compact dual-gas sensor based on the two near-infrared distributed feedback diode lasers and a multipass cell has been established for the simultaneous measurement of methane (CH₄) and acetylene (C₂H₂). The time division multiplexing calibration-free direct absorption spectroscopy is used to eliminate the cross interference in the application of multicomponent gas sensors. A wavelength stabilization technique based on the proportion integration differentiation feedback control is developed to suppress laser wavelength drift and an H-infinity (H_∞) filter algorithm to reduce the system noise. The results show that the detection sensitivity of CH₄ and C₂H₂ reaches 39.9 parts per billion (ppb) and 47.3 ppb in the optimal integration time of 556 s and 312 s, respectively. In addition, the 31 consecutive hours measured results of CH₄ in outdoor ambient air show that the proposed detection technology is very suitable for high-precision in-situ measurement of trace gases.

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采用波长稳定可调谐二极管激光吸收光谱和h-∞滤波算法的双气体传感器。

建立了一种基于两个近红外分布反馈二极管激光器和一个多通池的小型双气体传感器，用于同时测量甲烷（CH4）和乙炔（C2H2）。采用时分复用免校准直接吸收光谱法消除了多组分气体传感器应用中的交叉干扰。提出了一种基于比例积分微分反馈控制的波长稳定技术来抑制激光波长漂移，并提出了一种H∞滤波算法来降低系统噪声。结果表明，在最佳积分时间为556 s和312 s时，CH4和C2H2的检测灵敏度分别达到39.9 ppb和47.3 ppb。此外，室外环境空气中CH4连续31小时的测量结果表明，所提出的检测技术非常适合于微量气体的高精度原位测量。

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来源期刊

Applied Spectroscopy 工程技术-光谱学

CiteScore

6.60

自引率

5.70%

发文量

139

审稿时长

3.5 months

期刊介绍： Applied Spectroscopy is one of the world''s leading spectroscopy journals, publishing high-quality peer-reviewed articles, both fundamental and applied, covering all aspects of spectroscopy. Established in 1951, the journal is owned by the Society for Applied Spectroscopy and is published monthly. The journal is dedicated to fulfilling the mission of the Society to “…advance and disseminate knowledge and information concerning the art and science of spectroscopy and other allied sciences.”