Benzene detection using long wavelength QCL through LITES optical sensor

Andrea Zifarelli; Lavinia A. Mongelli; Francesco Paciolla; Kumar Kinjalk; Vincenzo Spagnolo; Pietro Patimisco

doi:10.1117/12.3016672

20 June 2024 Benzene detection using long wavelength QCL through LITES optical sensor

Andrea Zifarelli, Lavinia A. Mongelli, Francesco Paciolla, Kumar Kinjalk, Vincenzo Spagnolo, Pietro Patimisco

Proceedings Volume 12999, Optical Sensing and Detection VIII; 129990I (2024) https://doi.org/10.1117/12.3016672
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Detection of volatile organic compounds (VOCs) with particular attention to the BTEX group consisting of benzene, toluene, ethylbenzene, and xylene has risen as an important task in fields as environmental monitoring and breath analysis. Sensors based on optical detection techniques may represent an alternative to traditional approaches. However, optical sensing has been limited in terms of measurements selectivity as BTEX point out absorption features around 3.3 μm, where strong interferences from hydrocarbons occur. This issue can be eliminated operating at longer wavelength in the region from 13 to 15 μm, where BTEX show distinct and isolated absorption features. However, the investigations in this region have been limited by the lack of suitable laser sources as well as by the low performances of commercial detectors. In this work, a new approach to benzene detection is proposed, employing a long wavelength InAs-based QCL as light source and a quartz tuning fork as detector for TDLAS measurements, in light-induced thermoelastic spectroscopy (LITES) detection scheme. Analyte detection in the range of hundreds of part-per-billion with a shoe-box size design is demonstrated.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Andrea Zifarelli, Lavinia A. Mongelli, Francesco Paciolla, Kumar Kinjalk, Vincenzo Spagnolo, and Pietro Patimisco "Benzene detection using long wavelength QCL through LITES optical sensor", Proc. SPIE 12999, Optical Sensing and Detection VIII, 129990I (20 June 2024); https://doi.org/10.1117/12.3016672

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