A fiber-tip photoacoustic sensor for in situ trace gas detection

Sheng Zhou*, Davide Iannuzzi

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Most trace gas detection methods developed so far largely rely on active sampling procedures, which are known to introduce different kinds of artifacts. Here, we demonstrate sampling-free in situ trace gas detection in millimeter scale volumes with fiber coupled cantilever enhanced photoacoustic spectroscopy. Our 2.4 mm diameter fiber-tip sensor is free from the wavelength modulation induced background signal (a phenomenon that is often overlooked in photoacoustic spectroscopy) and reaches a normalized noise equivalent absorption coefficient of 1.3 × 10 -9 W cm -1 Hz -1/2 for acetylene detection. To validate its in situ gas detection capability, we inserted the sensor into a mini fermenter for headspace monitoring of CO 2 production during yeast fermentation. Our results show that the sensor can easily follow the different stages of the CO 2 production of the fermentation process in great detail.

Original languageEnglish
Article number023102
Pages (from-to)1-8
Number of pages8
JournalReview of Scientific Instruments
Volume90
Issue number2
Early online date6 Feb 2019
DOIs
Publication statusPublished - Feb 2019

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