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

Full Article  |  PDF Article
OSA Recommended Articles
Surface contamination detection by means of near-infrared stimulation of thermal luminescence

Arthur H. Carrieri and Erik S. Roese
Appl. Opt. 45(4) 736-743 (2006)

Thermal luminescence water monitor

Arthur H. Carrieri and Erik S. Roese
Appl. Opt. 40(18) 2998-3004 (2001)

Thermal luminescence spectroscopy chemical imaging sensor

Arthur H. Carrieri, Tudor N. Buican, Erik S. Roese, James Sutter, and Alan C. Samuels
Appl. Opt. 51(28) 6765-6780 (2012)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription