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Real-time detection of chemical warfare agents using multi-wavelength photoacoustics

Author: Kristan Gurton; Melvin A Felton; Richard L Tober; U.S. Army Research Laboratory.
Publisher: Adelphi, MD : Army Research Laboratory, [2009]
Series: ARL-TR (Aberdeen Proving Ground, Md.), 4782.
Edition/Format:   eBook : Document : National government publication : English
Summary:
We present a proof-of-concept study designed to investigate the utility of operating a conventional photoacoustic spectroscopy technique in a "multi-wavelength" mode applied to chemical vapor/aerosols for application of trace species detection and identification. The technique involves propagating three or more laser sources through a non-resonate, flow through photoacoustic cell. Each laser source is modulated at a  Read more...
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Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Kristan Gurton; Melvin A Felton; Richard L Tober; U.S. Army Research Laboratory.
OCLC Number: 402287957
Notes: Title from PDF title screen (viewed on Aug. 20, 2009).
"April 2009."
Description: 1 online resource (iv, 12 pages) : illustrations (some color).
Series Title: ARL-TR (Aberdeen Proving Ground, Md.), 4782.
Responsibility: by Kristan Gurtan, Melvin Felton, and Richard Tober.

Abstract:

We present a proof-of-concept study designed to investigate the utility of operating a conventional photoacoustic spectroscopy technique in a "multi-wavelength" mode applied to chemical vapor/aerosols for application of trace species detection and identification. The technique involves propagating three or more laser sources through a non-resonate, flow through photoacoustic cell. Each laser source is modulated at a different frequency, chosen at some convenient acoustic frequency. A portion of each laser's power is absorbed by a particular test gas/aerosol that is passing through the PA cell, resulting in a acoustic signal that is found to be proportional to the absorption cross section of the gas/vapor at the particular laser wavelength. A superposition of frequency component (equal to the number of laser wavelengths used), combines with the ambient acoustic noise spectrum and is recorded by an electret microphone housed in the photoacoustic cell. The signal is deconvolved using phase sensitive detection where each component (one corresponding to a particular modulation frequency for a particular laser) is amplified and recorded as function of species concentration. Ratios of the resultant absorption information are used to produce an identifiable metric that remains constant for all concentrations. For the study presented here, we used 3 laser wavelengths all lying in the spectrally rich long-wave infrared (LWIR), i.e., 8.72, 9.27, and 10.35 um. Test nerve agents simulants include (but not limited to), diethyl phosphonate (DEMP), dimethyl methylphosphonate (DMMP), and diisopropyl phosphonate (DIMP). Measured photoacoustic absorption results compare well with Fourier Transform Infrared (FTIR) analysis that is conducted in situ with the photoacoustic portion of the measurement.

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Primary Entity

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