The Resource Real-time detection of chemical warfare agents using multi-wavelength photoacoustics, by Kristan Gurtan, Melvin Felton, and Richard Tober

Real-time detection of chemical warfare agents using multi-wavelength photoacoustics, by Kristan Gurtan, Melvin Felton, and Richard Tober

Label
Real-time detection of chemical warfare agents using multi-wavelength photoacoustics
Title
Real-time detection of chemical warfare agents using multi-wavelength photoacoustics
Statement of responsibility
by Kristan Gurtan, Melvin Felton, and Richard Tober
Creator
Contributor
Subject
Language
eng
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 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
Member of
Cataloging source
DTICE
http://library.link/vocab/creatorName
Gurton, Kristan
Government publication
federal national government publication
Index
no index present
Literary form
non fiction
Nature of contents
dictionaries
http://library.link/vocab/relatedWorkOrContributorName
  • Felton, Melvin
  • Tober, Richard
  • U.S. Army Research Laboratory
Series statement
ARL-TR
Series volume
4782
http://library.link/vocab/subjectName
Chemical warfare
Target audience
adult
Label
Real-time detection of chemical warfare agents using multi-wavelength photoacoustics, by Kristan Gurtan, Melvin Felton, and Richard Tober
Link
http://purl.access.gpo.gov/GPO/LPS116237
Instantiates
Publication
Note
  • Title from PDF title screen (viewed on Aug. 20, 2009)
  • "April 2009."
Carrier category
online resource
Carrier category code
cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
txt
Content type MARC source
rdacontent
Control code
17616817
Extent
1 online resource (iv, 12 pages)
Form of item
electronic
Governing access note
APPROVED FOR PUBLIC RELEASE
Media category
computer
Media MARC source
rdamedia
Media type code
c
Other physical details
illustrations (some color).
Label
Real-time detection of chemical warfare agents using multi-wavelength photoacoustics, by Kristan Gurtan, Melvin Felton, and Richard Tober
Link
http://purl.access.gpo.gov/GPO/LPS116237
Publication
Note
  • Title from PDF title screen (viewed on Aug. 20, 2009)
  • "April 2009."
Carrier category
online resource
Carrier category code
cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
txt
Content type MARC source
rdacontent
Control code
17616817
Extent
1 online resource (iv, 12 pages)
Form of item
electronic
Governing access note
APPROVED FOR PUBLIC RELEASE
Media category
computer
Media MARC source
rdamedia
Media type code
c
Other physical details
illustrations (some color).

Library Locations

    • Indiana State LibraryBorrow it
      315 W. Ohio St., Indianapolis, IN, 46202, US
      39.77004 -86.164015

Library Links

Processing Feedback ...