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Proceedings Paper

Comparison Of Aerial To On-The-Roof Infrared Moisture Surveys
Author(s): Charles Korhonen; Wayne Tobiasson; Alan Greatorex
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Paper Abstract

Prior research by the Corps of Engineers has shown aerial thermography to he useful as a reconnaissance tool for finding wet roof insulation. This conclusion was based on findings from thermal line scanners flown at about 1000 feet in military fixed-wing aircraft and from hand-held thermal imagers flown at about 500 feet in military helicopters. During the spring of 1983 a comprehensive aerial to on-the-roof infrared comparison study was conducted on several roofs at Fort Devens, Massachusetts. These recent studies confirm our earlier opinion that oblique thermography is generally of reconnaissance value only. However, "straight-down" thermography from either fixed-wing aircraft or from helicopters can be used to produce reasonably accurate maps of wet roof areas. The most accurate maps were produced by thermal imaging systems in a helicopter hovering as close as 200 feet above a roof. This study suggests that some forms of airborne thermography can be of more value than just a reconnaissance tool in finding wet roof insulation. Of course, a visual examination of each roof along with a few core samples are still needed before recommendations for maintenance and repair can be made.

Paper Details

Date Published: 27 March 1984
PDF: 11 pages
Proc. SPIE 0446, Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control, (27 March 1984); doi: 10.1117/12.939147
Show Author Affiliations
Charles Korhonen, U.S. Army Cold Regions Research and Engineering Laboratory (United States)
Wayne Tobiasson, U.S. Army Cold Regions Research and Engineering Laboratory (United States)
Alan Greatorex, U.S. Army Cold Regions Research and Engineering Laboratory (United States)


Published in SPIE Proceedings Vol. 0446:
Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control
Gordon J. Burrer, Editor(s)

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