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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 24 — Aug. 20, 2003
  • pp: 4901–4908

Remote photoacoustic detection of liquid contamination of a surface

Brian Perrett, Michael Harris, Guy N. Pearson, David V. Willetts, and Mark C. Pitter  »View Author Affiliations


Applied Optics, Vol. 42, Issue 24, pp. 4901-4908 (2003)
http://dx.doi.org/10.1364/AO.42.004901


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Abstract

A method for the remote detection and identification of liquid chemicals at ranges of tens of meters is presented. The technique uses pulsed indirect photoacoustic spectroscopy in the 10-µm wavelength region. Enhanced sensitivity is brought about by three main system developments: (1) increased laser-pulse energy (150 µJ/pulse), leading to increased strength of the generated photoacoustic signal; (2) increased microphone sensitivity and improved directionality by the use of a 60-cm-diameter parabolic dish; and (3) signal processing that allows improved discrimination of the signal from noise levels through prior knowledge of the pulse shape and pulse-repetition frequency. The practical aspects of applying the technique in a field environment are briefly examined, and possible applications of this technique are discussed.

© 2003 Optical Society of America

OCIS Codes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.0300) Spectroscopy : Spectroscopy
(300.6430) Spectroscopy : Spectroscopy, photothermal

History
Original Manuscript: November 22, 2002
Revised Manuscript: April 16, 2003
Published: August 20, 2003

Citation
Brian Perrett, Michael Harris, Guy N. Pearson, David V. Willetts, and Mark C. Pitter, "Remote photoacoustic detection of liquid contamination of a surface," Appl. Opt. 42, 4901-4908 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-24-4901


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References

  1. A. Rosencwaig, Photoacoustics and Photoacoustic Spectroscopy (Wiley, New York, 1980).
  2. A. C. Tam, “Applications of photoacoustic sensing techniques,” Rev. Mod. Phys. 58, 381–431 (1986). [CrossRef]
  3. M. Harris, G. N. Pearson, D. V. Willetts, K. Ridley, P. R. Tapster, B. Perrett, “Pulsed indirect photoacoustic spectroscopy: application to remote detection of condensed phases,” Appl. Opt. 39, 1032–1041 (2000). [CrossRef]
  4. G. N. Pearson, M. Harris, D. V. Willetts, P. R. Tapster, P. J. Roberts, “Differential laser absorption and thermal emission for remote identification of opaque surface coatings,” Appl. Opt. 36, 2713–2720 (1997). [CrossRef] [PubMed]
  5. D. J. Brassington, “Photo-acoustic detection and ranging—a new technique for the remote detection of gases,” J. Phys. D 15, 219–228 (1982). [CrossRef]
  6. “DPA Microphones Catalogue” at www.dpamicrophones.com .
  7. A. Wood, Acoustics (Blackie, London, 1960).

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