High-sensitivity detection of trace gases using dynamic photoacoustic spectroscopy
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Wynn-2014-High-sensitivity det.pdf
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1.73 MB
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Author(s)
Wynn, Charles M.
Palmacci, Stephen
Clark, Michelle L.
Kunz, Roderick R.
Date Issued
August 2013
Journal
Optical Engineering
Publisher
SPIE
Citation
Wynn, Charles M., Stephen Palmacci, Michelle L. Clark, and Roderick R. Kunz. “High-sensitivity detection of trace gases using dynamic photoacoustic spectroscopy.” Optical Engineering 53, no. 2 (February 1, 2014): 021103.
Version
Final published version
Abstract
Lincoln Laboratory of Massachusetts Institute of Technology has developed a technique known as dynamic photoacoustic spectroscopy (DPAS) that could enable remote detection of trace gases via a field-portable laser-based system. A fielded DPAS system has the potential to enable rapid, early warning of airborne chemical threats. DPAS is a new form of photoacoustic spectroscopy that relies on a laser beam swept at the speed of sound to amplify an otherwise weak photoacoustic signal. We experimentally determine the sensitivity of this technique using trace quantities of SF[subscript 6] gas. A clutter-limited sensitivity of ~100 ppt is estimated for an integration path of 0.43 m. Additionally, detection at ranges over 5 m using two different detection modalities is demonstrated: a parabolic microphone and a laser vibrometer. Its utility in detecting ammonia emanating from solid samples in an ambient environment is also demonstrated.
MIT Department
Lincoln Laboratory
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1117/1.OE.53.2.021103
