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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 27 — Sep. 20, 1999
  • pp: 5880–5886

Thermal luminescence sensor for ground-path contamination detection

Arthur H. Carrieri, Irving F. Barditch, David J. Owens, Erik S. Roese, Pascal I. Lim, and Michael V. Talbard  »View Author Affiliations


Applied Optics, Vol. 38, Issue 27, pp. 5880-5886 (1999)
http://dx.doi.org/10.1364/AO.38.005880


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Abstract

A standoff method of detecting liquids on terrestrial and synthetic landscapes is presented. The interstitial liquid layers are identified through their unique molecular vibration modes in the 7.14–14.29-µm middle infrared (fingerprint) region of liberated thermal luminescence. Several seconds of 2.45-GHz beam exposure at 1.5 W cm-1 is sufficient for detecting polydimethyl siloxane lightly wetting the soil through its fundamental Si–CH3 and Si–O–Si stretching modes in the fingerprint region. A detection window of thermal opportunity opens as the surface attains maximum thermal gradient following irradiation by the microwave beam. The contaminant is revealed inside this window by means of a simple difference-spectrum measurement. Our goal is to reduce the time needed for optimum detection of the contaminant’s thermal spectrum to a subsecond exposure from a limited intensity beam.

© 1999 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(070.4790) Fourier optics and signal processing : Spectrum analysis
(070.5010) Fourier optics and signal processing : Pattern recognition
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

History
Original Manuscript: February 5, 1999
Revised Manuscript: June 16, 1999
Published: September 20, 1999

Citation
Arthur H. Carrieri, Irving F. Barditch, David J. Owens, Erik S. Roese, Pascal I. Lim, and Michael V. Talbard, "Thermal luminescence sensor for ground-path contamination detection," Appl. Opt. 38, 5880-5886 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-27-5880

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