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Parts-per-billion detection of carbon monoxide: A comparison between quartz-enhanced photoacoustic and photothermal spectroscopy.
- Source :
-
Photoacoustics [Photoacoustics] 2021 Feb 01; Vol. 22, pp. 100244. Date of Electronic Publication: 2021 Feb 01 (Print Publication: 2021). - Publication Year :
- 2021
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Abstract
- We report on a comparison between two optical detection techniques, one based on a Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) detection module, where a quartz tuning fork is acoustically coupled with a pair of millimeter-sized resonator tubes; and the other one based on a Photothermal Spectroscopy (PTS) module where a Fabry-Perot interferometer acts as transducer to probe refractive index variations. When resonant optical absorption of modulated light occurs in a gas sample, QEPAS directly detects acoustic waves while PTS probes refractive index variations caused by local heating. Compact QEPAS and PTS detection modules were realized and integrated in a gas sensor system for detection of carbon monoxide (CO), targeting the fundamental band at 4.6 μm by using a distributed-feedback quantum cascade laser. Performance was compared and ultimate detection limits up to ∼ 6 part-per-billion (ppb) and ∼15 ppb were reached for QEPAS and the PTS module, respectively, using 100 s integration time and 40 mW of laser power.<br />Competing Interests: No conflict of interest<br /> (© 2021 Published by Elsevier GmbH.)
Details
- Language :
- English
- ISSN :
- 2213-5979
- Volume :
- 22
- Database :
- MEDLINE
- Journal :
- Photoacoustics
- Publication Type :
- Academic Journal
- Accession number :
- 33604239
- Full Text :
- https://doi.org/10.1016/j.pacs.2021.100244