Precise Analysis of NO₂ Concentration Based on Absorption Spectroscopy in the 6.2 µm Wavelength Region Using Multi-Voigt Fitting
Year: 2026
Type: article
Abstract: A high-resolution Tunable Diode Laser Absorption Spectroscopy (TDLAS) system integrated with Multi-Voigt Fitting was developed to enable precise quantification of nitrogen dioxide (NO₂) concentrations. As a key atmospheric pollutant generated during high-temperature combustion, NO₂ requires accurate and real-time monitoring. Measurements were performed using a 1599 cm-1 (6.25 ㎛) distributed feedback (DFB) laser over a concentration range of 10-100 ppm at both room temperature (296 K) and elevated temperature (573 K). The NO₂ absorption spectrum exhibited multiple overlapping peaks, quantitatively resolved through a Multi-Voigt Fitting algorithm. The system demonstrated high accuracy, maintaining deviations within 5% of certified reference gas concentrations across all temperature conditions. The proposed method enables high-fidelity, non-invasive NO₂ diagnostics in harsh environments and offers strong potential for deployment in combustion and environmental sensing applications.
Authors: Jiyeon Park, Hyungseok Kim, Changkook Ryu, Miyeon Yoo, Daehae Kim, Changyeop Lee
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7160120031
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