Stimulated dual-band infrared computed tomography: a tool to inspect the aging infrastructure

Nancy DelGrande; Philip F. Durbin

doi:10.1117/12.218230

8 September 1995 Stimulated dual-band infrared computed tomography: a tool to inspect the aging infrastructure

Nancy DelGrande, Philip F. Durbin

Proceedings Volume 2552, Infrared Technology XXI; (1995) https://doi.org/10.1117/12.218230
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

We have developed stimulated dual-band infrared (IR) computed tomography as a tool to inspect the aging infrastructure. Our system has the potential to locate and quantify structural damage within airframes and bridge decks. Typically, dual-band IR detection methods improve the signal-to-noise ratio by a factor of ten, compared to single-band IR detection methods. We conducted a demonstration at Boeing using a uniform pulsed-heat source to stimulate IR images of hidden defects in the 727 fuselage. Our dual-band IR camera and image processing system produced temperature, thermal inertia, and cooling-rate maps. In combination, these maps characterized the defect site, size, depth, thickness, and type. We quantified the percent metal loss from corrosion above a threshold of 5%, with overall uncertainties of 3%. Also, we conducted a feasibility study of dual-band IR thermal imaging for bridge deck inspections. We determined the sites and relative concrete displacement of 12- in. and 4-in. deep delaminations from thin styrofoam implants in asphalt-covered concrete slabs. We demonstrated the value of dual-band IR computed tomography to quantify structural damage within flash-heated airframes and naturally heated bridge decks.

Citation Download Citation

Nancy DelGrande and Philip F. Durbin "Stimulated dual-band infrared computed tomography: a tool to inspect the aging infrastructure", Proc. SPIE 2552, Infrared Technology XXI, (8 September 1995); https://doi.org/10.1117/12.218230

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