Mapping hidden aircraft defects with dual-band infrared computed tomography

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Description

Infrared computed tomography (IRCT) is a promising, non-contact, nondestructive evaluation tool used to inspect the mechanical integrity of large structures. We describe on-site, proof-of-principle demonstrations of IRCt to inspect defective metallic and composite structures. The IRCT system captures time sequences of heat-stimulated, dual-band infrared (DBIR) thermal maps for flash-heated and naturally-heated targets. Our VIEW algorithms produce co-registered thermal, thermal inertia, and thermal-timegram maps from which we quantify the percent metal-loss corrosion damage for airframes and the defect sites, depths, and host-material physical properties for composite structures. The IRCT method clarifies the type of defect, e.g., corrosion, fabrication, foreign-material insert, delamination, ... continued below

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14 p.

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Del Grande, N.K. & Durbin, P.F. April 3, 1995.

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Description

Infrared computed tomography (IRCT) is a promising, non-contact, nondestructive evaluation tool used to inspect the mechanical integrity of large structures. We describe on-site, proof-of-principle demonstrations of IRCt to inspect defective metallic and composite structures. The IRCT system captures time sequences of heat-stimulated, dual-band infrared (DBIR) thermal maps for flash-heated and naturally-heated targets. Our VIEW algorithms produce co-registered thermal, thermal inertia, and thermal-timegram maps from which we quantify the percent metal-loss corrosion damage for airframes and the defect sites, depths, and host-material physical properties for composite structures. The IRCT method clarifies the type of defect, e.g., corrosion, fabrication, foreign-material insert, delamination, unbond, void, and quantifies the amount of damage from the defect, e.g., the percent metal-loss from corrosion in metal structures, the depth, thickness, and areal extent of heat damage in multi-layered composite materials. Potential long-term benefits of IRCT technology are in-service monitoring of incipient corrosion damage, to avoid catastrophic failure and production-monitoring of cure states for composite materials.

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14 p.

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OSTI as DE95011531

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  • Conference on nondestructive evaluation of aging infrastructure, Oakland, CA (United States), 6-8 Jun 1995

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  • Other: DE95011531
  • Report No.: UCRL-JC--120546
  • Report No.: CONF-9506126--2
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/113968 | External Link
  • Office of Scientific & Technical Information Report Number: 61711
  • Archival Resource Key: ark:/67531/metadc690972

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  • April 3, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 17, 2016, 2:15 p.m.

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Del Grande, N.K. & Durbin, P.F. Mapping hidden aircraft defects with dual-band infrared computed tomography, article, April 3, 1995; California. (digital.library.unt.edu/ark:/67531/metadc690972/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.