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Proceedings Paper

Thermal imaging of subsurface microwave absorbers in dielectric materials
Author(s): Robert Osiander; Jane W. Maclachlan Spicer; John C. Murphy
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Paper Abstract

The use of microwaves as a heating source in time-resolved IR radiometry provides the ability to heat surface and subsurface microwave-absorbing regions of a specimen directly. This can improve the contrast and spatial resolution of such regions and enhance their detectibility when compared with conventional laser or flashlamp sources. The experiments reported here use microwave heating with IR detection. Results on plexiglass-water-Teflon test specimens with absorbers at different depths in the sample are described by a 1D analytical model. Measurements using microwave and optical heating on epoxy-coated steel pipes are compared and demonstrate the ability of microwave heating to detect subsurface water voids very efficiently. Other applications of the method to microwave imaging, field mapping and imaging of defects in composite materials are discussed.

Paper Details

Date Published: 21 March 1994
PDF: 9 pages
Proc. SPIE 2245, Thermosense XVI: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (21 March 1994); doi: 10.1117/12.171162
Show Author Affiliations
Robert Osiander, Johns Hopkins Univ. (United States)
Jane W. Maclachlan Spicer, Johns Hopkins Univ. (United States)
John C. Murphy, Johns Hopkins Univ. (United States)


Published in SPIE Proceedings Vol. 2245:
Thermosense XVI: An International Conference on Thermal Sensing and Imaging Diagnostic Applications
John R. Snell, Editor(s)

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