A spectroscopy-constraint network for fast thermochemical process monitoring using wavelength modulation spectroscopy

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Xia, Jiangnan and Zhang, Rui and Ahmed, Ihab and Pourkashanian, Mohamed and Armstrong, Ian and Lengden, Michael and Johnstone, Walter and McCann, Hugh and Liu, Chang (2025) A spectroscopy-constraint network for fast thermochemical process monitoring using wavelength modulation spectroscopy. IEEE Transactions on Instrumentation and Measurement. ISSN 0018-9456 (https://doi.org/10.1109/tim.2025.3556818)

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Abstract

Performance optimization of various combustion-based power generation systems requires fast and accurate online monitoring of their thermochemical parameters. As an in situ sensing technology, laser absorption spectroscopy (LAS) with modulated wavelength, has been widely adopted. However, rapid parameters retrieval from modulated LAS signal can be challenging due to the underlying complex and non-linear spectroscopy model. Most existing acceleration algorithms utilize supervised neural networks in an end-to-end manner ignored constraints on the spectroscopic model constraint. In addition, most state-of-the-art neural networks exhibit complicated structures with low computation efficiency. In this work, we developed a spectroscopy-constraint neural network for rapid thermochemical parameters extraction. The laser spectroscopic model is integrated in the proposed network through an encoder-decoder structure, offering independency on synthetic labeled dataset and hence enhance its performance on measurement thermochemical parameters in industrial scenarios. Furthermore, the developed network has a simple structure and lightweight parameter size. A case study of an aircraft engine exhaust monitoring is presented. The proposed model effectively reveals the dynamic behaviors of the engine. Compared with two representative supervised models, the new model exhibits better performance on spectral recovery as well as higher computational efficiency.

ORCID iDs

Xia, Jiangnan, Zhang, Rui, Ahmed, Ihab, Pourkashanian, Mohamed, Armstrong, Ian ORCID logoORCID: https://orcid.org/0009-0003-1652-7990, Lengden, Michael ORCID logoORCID: https://orcid.org/0000-0002-9122-9462, Johnstone, Walter ORCID logoORCID: https://orcid.org/0000-0002-6376-9445, McCann, Hugh and Liu, Chang;
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