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

Abstract

The authors have developed stimulated dual-band infrared (IR) computed tomography as a tool to inspect the aging infrastructure. The 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. They conducted a demonstration at Boeing using a uniform pulsed-heat source to stimulate IR images of hidden defects in the 727 fuselage. The 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. The authors quantified the percent metal loss from corrosion above a threshold of 5%, with overall uncertainties of 3%. Also, they conducted a feasibility study of dual-band IR thermal imaging for bridge deck inspections. They determined the sites and relative concrete displacement of 2-in. and 4-in. deep delaminations from thin styrofoam implants in asphalt-covered concrete slabs. They demonstrated the value of dual-band IR computed tomography to quantify structural damage within flash-heated airframes and naturally-heated bridge decks.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Federal Aviation Administration, Washington, DC (United States); Federal Highway Administration, Washington, DC (United States)
OSTI Identifier:
113968
Report Number(s):
UCRL-JC-120330; CONF-950793-46
ON: DE96000079; TRN: AHC29526%%112
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Conference: 40. annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 9-14 Jul 1995; Other Information: PBD: 27 Jun 1995
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; AIRCRAFT COMPONENTS; INFRARED THERMOGRAPHY; COMPUTERIZED TOMOGRAPHY; BRIDGES; NONDESTRUCTIVE TESTING; INSPECTION; FEASIBILITY STUDIES; IMAGE PROCESSING; CORROSION; EXPERIMENTAL DATA

Citation Formats

Del Grande, N K, and Durbin, P F. Stimulated dual-band infrared computed tomography: A tool to inspect the aging infrastructure. United States: N. p., 1995. Web. doi:10.2172/113968.
Del Grande, N K, & Durbin, P F. Stimulated dual-band infrared computed tomography: A tool to inspect the aging infrastructure. United States. https://doi.org/10.2172/113968
Del Grande, N K, and Durbin, P F. Tue . "Stimulated dual-band infrared computed tomography: A tool to inspect the aging infrastructure". United States. https://doi.org/10.2172/113968. https://www.osti.gov/servlets/purl/113968.
@article{osti_113968,
title = {Stimulated dual-band infrared computed tomography: A tool to inspect the aging infrastructure},
author = {Del Grande, N K and Durbin, P F},
abstractNote = {The authors have developed stimulated dual-band infrared (IR) computed tomography as a tool to inspect the aging infrastructure. The 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. They conducted a demonstration at Boeing using a uniform pulsed-heat source to stimulate IR images of hidden defects in the 727 fuselage. The 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. The authors quantified the percent metal loss from corrosion above a threshold of 5%, with overall uncertainties of 3%. Also, they conducted a feasibility study of dual-band IR thermal imaging for bridge deck inspections. They determined the sites and relative concrete displacement of 2-in. and 4-in. deep delaminations from thin styrofoam implants in asphalt-covered concrete slabs. They demonstrated the value of dual-band IR computed tomography to quantify structural damage within flash-heated airframes and naturally-heated bridge decks.},
doi = {10.2172/113968},
url = {https://www.osti.gov/biblio/113968}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {6}
}