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

Sheng Zhou; Davide Iannuzzi

doi:10.1063/1.5082955

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

Sheng Zhou^*, Davide Iannuzzi

^*Corresponding author for this work

Research output: Contribution to Journal › Article › Academic › peer-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 language	English
Article number	023102
Pages (from-to)	1-8
Number of pages	8
Journal	Review of Scientific Instruments
Volume	90
Issue number	2
Early online date	6 Feb 2019
DOIs	https://doi.org/10.1063/1.5082955
Publication status	Published - Feb 2019

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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. ",

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