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Abstract
A real-time trace gas detector for benzene is demonstrated. The measurement system takes advantage of modest enrichment through short adsorption periods to reach a ppt-level detection limit with a sampling cycle of 90 s, which includes sample adsorption, desorption, and a spectroscopic measurement. Benzene is collected on Tenax TA sorbent for 30 s and then detected from the enriched samples with photoacoustic spectroscopy. High sensitivity is achieved using cantilever-enhanced photoacoustic spectroscopy and a continuous-wave quantum cascade laser emitting at 14.8 mu m wavelength, which corresponds to the absorption wavelength of the strongest benzene infrared band. We reach a detection limit of 150 ppt of benzene, over one sampling cycle. Interference from humidity and other common petrochemicals is evaluated. (C) 2022 Optica Publishing Group
Original language | English |
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Pages (from-to) | 1892-1897 |
Number of pages | 6 |
Journal | Applied Optics |
Volume | 61 |
Issue number | 8 |
DOIs | |
Publication status | Published - 10 Mar 2022 |
MoE publication type | A1 Journal article-refereed |
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Dive into the research topics of 'Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection'. Together they form a unique fingerprint.Projects
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PREIN: Photonics Research and Innovation
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding