Optimization for hydrogen gas quantitative measurement using tunable diode laser absorption spectroscopy

• Published in: Optics and laser technology Vol. 180; p. 111587
• Main Authors: Xiafukaiti, Alifu, Lagrosas, Nofel, Ogita, Masakazu, Oi, Nobuhiko, Ichikawa, Yuji, Sugimoto, Sachiyo, Asahi, Ippei, Yamaguchi, Shigeru, Shiina, Tatsuo
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2025
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2024.111587

•An innovative method for precise hydrogen gas measurement using TDLAS technique has been optimized.•A linear detection range for hydrogen gas concentration of 0.01% to 100% are achieved.•A minimum detection limits of 0.0055% at integration time of 30 s is demonstrated by this TDLAS system.
Gas sensors are vital for safety, quality control, and environmental preservation across diverse industries. Tunable diode laser absorption spectroscopy (TDLAS) is widely employed for gas analysis due to its high sensitivity and selectivity. However, quantifying low concentrations of hydrogen gas using TDLAS in the infrared region proves challenging due to its lower absorption compared to other gases in the NIR region. This study introduces an innovative method for precise hydrogen gas measurement through the analysis of absorption spectra at different pressures and the employment of a high-pressure gas cell. By applying these methodologies to a calibration-free technique, we can realize the optimal measurement conditions for increasing the gas detection limit and stabilizing the wavelength lock for the laser diode. As a result, a linear relationship between hydrogen gas concentration and sensor response is achieved in the wide detection range of 0.01% to 100%. Under the optimal measurement conditions, our TDLAS system’s stability is demonstrated with minimum detection limits of 0.2866% and 0.0055% at integration times of 1 s and 30 s, respectively.