Actions for Multi-use applications of dual-band infrared (DBIR) thermal imaging for detecting obscured structural defects [electronic resource].

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Multi-use applications of dual-band infrared (DBIR) thermal imaging for detecting obscured structural defects [electronic resource].

Published
Livermore, Calif : Lawrence Livermore National Laboratory, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
12 pages : digital, PDF file
Additional Creators
Lawrence Livermore National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Precise dual-band infrared (DBIR) thermal imaging provides a useful diagnostic tool for wide-area detection of defects from corrosion damage in metal airframes, heat damage in composite structures and structural damage in concrete bridge decks. We use DBIR image ratios to enhance surface temperature contrast, remove surface emissivity noise and increase signal-to-clutter ratios. We clarify interpretation of hidden defect sites by distinguishing temperature differences at defect sites from emissivity differences at clutter sites. This reduces the probability of false calls associated with misinterpreted image data. For airframe inspections, we map flash-heated defects in metal structures. The surface temperature rise above ambient at corrosion-thinned sites correlates with the percentage of material loss from corrosion thinning. For flash-heated composite structures, we measure the temperature-time history which relates to the depth and extent of heat damage. In preparation for bridge deck inspections, we map the natural day and night temperature variations at known concrete slab delamination sites which heat and coot at different rates than their surroundings. The above-ambient daytime and below-ambient nightime delamination site temperature differences correlate with the volume of replaced concrete at the delamination sites.
Report Numbers
E 1.99:ucrl-jc--117416
E 1.99: conf-940449--14
conf-940449--14
ucrl-jc--117416
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
05/01/1994.
"ucrl-jc--117416"
" conf-940449--14"
"DE94017178"
Society of Photo-Optical Instrumentation Engineers conference on intelligent information systems,Orlando, FL (United States),4-8 Apr 1994.
Durbin, P.F.; Del Grande, N.K.
Federal Aviation Administration, Washington, DC (United States)
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14674550