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

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

Fingerprint

Photoacoustic effect
Photoacoustic spectroscopy
Fermentation
fermentation
photoacoustic spectroscopy
fibers
Fibers
sensors
Sensors
Gases
gases
Sampling
Fermenters
Optical fiber coupling
sampling
Acetylene
Acoustic noise
Yeast
yeast
Modulation

Cite this

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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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A fiber-tip photoacoustic sensor for in situ trace gas detection. / Zhou, Sheng; Iannuzzi, Davide.

In: Review of Scientific Instruments, Vol. 90, No. 2, 023102, 02.2019, p. 1-8.

Research output: Contribution to JournalArticleAcademicpeer-review

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