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Applied Optics

Applied 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)

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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

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

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)

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