A near-infrared transformer fault gases C2H4/CH4 sensor based on aliasing spectra decoupling model with eigenvalues extraction

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-06-05 DOI:10.1007/s00340-025-08492-1

Guolin Li, Longju Li, Jiarui Li, Yingjie Zhao, Ruixiang Sun, Haoran Yuan, Guangzhao Cui, Jianyu Gu, Jinxu Yang, Wenxuan Zhao, Xin Zhang

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Abstract

A C₂H₄/CH₄ two-component synchronous monitoring sensor based on aliasing spectra decoupling model is designed. The distributed feedback (DFB) laser with the central wavelength of 1626 nm and the multi-pass gas cell (MPGC) with an effective optical path of 20 m are integrated into the sensor. The aliasing spectra decoupling model effectively decouples second harmonic (2f) signals, and its decoupling performance is validated through carrying out concentration monitoring experiments of mixed gases C₂H₄ and CH₄, where the concentration range of C₂H₄ is 4–100 ppm and the CH₄ is 20–500 ppm. Under the background of severe aliasing of C₂H₄ and CH₄ absorption lines, the sensor can still achieve high-precision inversion of each single gas. Among them, the root-mean-square error (RMSE) of C₂H₄ is 0.7491 ppm, while for CH₄ it is 10.4028 ppm. In comparison to the least squares method, the precision of concentration inversion is significantly enhanced. This indicates that the aliasing spectra decoupling model is capable of mitigating the impact of aliasing absorption lines on the accuracy of concentration inversion.

Graphical abstract

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基于混叠光谱解耦模型和特征值提取的近红外变压器故障气体C2H4/CH4传感器

设计了一种基于混叠光谱解耦模型的C2H4/CH4双组分同步监测传感器。该传感器集成了中心波长为1626 nm的分布式反馈（DFB）激光器和有效光程为20 m的多通气体电池（MPGC）。混叠谱解耦模型能有效解耦二次谐波（2f）信号，并通过C2H4和CH4混合气体浓度监测实验验证了其解耦效果，C2H4浓度范围为4 ~ 100 ppm， CH4浓度范围为20 ~ 500 ppm。在C2H4和CH4吸收谱线混叠严重的背景下，该传感器仍能实现对各单一气体的高精度反演。其中，C2H4的均方根误差（RMSE）为0.7491 ppm， CH4的均方根误差为10.4028 ppm。与最小二乘法相比，浓度反演的精度显著提高。这表明混叠光谱解耦模型能够减轻混叠吸收线对浓度反演精度的影响。图形抽象

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.