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Title: Demonstration of dual-band infrared thermal imaging at Grass Valley Creek bridges

Abstract

We demonstrated dual-band infrared (DBIR) thermal imaging at the Grass Valley Creek Bridges near Redding CA. DBIR thermal imaging is an enabling technology for rapid, reliable, bridge deck inspections while minimizing lane closures. bridge-deck inspections were conducted from a mobile DBIR bridge inspection laboratory during November 2-3, 1995. We drove this self-contained unit at limited highway speeds over 0.4 lane miles of bridge deck. Using two thermal IR bands, we distinguished delaminations from clutter. Clutter, or unwanted thermal detail, occurs from foreign materials or uneven shade on the bridge deck surface. By mapping the DBIR spectral- response differences at 3-5 {mu}m and 8-12 {mu}m, we removed foreign material clutter. By mapping the deck diurnal thermal inertia variations, we removed clutter from uneven shade. Thermal inertia is a bulk deck property, the square root of thermal conductivity x density x heat capacity. Delaminated decks have below-average thermal inertias, or above-average day-night temperature excursions. Compared to normal decks areas, delaminated deck areas were typically 2 or 3 {degrees}C warmer at noon, and 0.5{degrees}C cooler at night. The mobile DBIR bridge inspection laboratory is currently undergoing extensive testing to examine bridges by the Federal Highway Administration.

Authors:
; ; ; ;
Publication Date:
Research Org.:
California Univ., Berkeley, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
461130
Report Number(s):
UCRL-JC-124359; CONF-961219-3
ON: DE97051355
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the Society of Photo-Optical Instrumentation Engineers (SPIE), Scottsdale, AZ (United States), 4-5 Dec 1996; Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; BRIDGES; INFRARED THERMOGRAPHY; NONDESTRUCTIVE TESTING; INSPECTION; PERFORMANCE TESTING; PORTABLE EQUIPMENT; IMAGES

Citation Formats

Del Grande, N. K., Durbin, P.F., Logan, C.M., Perkins, D.E., and Schich, P.C. Demonstration of dual-band infrared thermal imaging at Grass Valley Creek bridges. United States: N. p., 1996. Web.
Del Grande, N. K., Durbin, P.F., Logan, C.M., Perkins, D.E., & Schich, P.C. Demonstration of dual-band infrared thermal imaging at Grass Valley Creek bridges. United States.
Del Grande, N. K., Durbin, P.F., Logan, C.M., Perkins, D.E., and Schich, P.C. Fri . "Demonstration of dual-band infrared thermal imaging at Grass Valley Creek bridges". United States. https://www.osti.gov/servlets/purl/461130.
@article{osti_461130,
title = {Demonstration of dual-band infrared thermal imaging at Grass Valley Creek bridges},
author = {Del Grande, N. K. and Durbin, P.F. and Logan, C.M. and Perkins, D.E. and Schich, P.C.},
abstractNote = {We demonstrated dual-band infrared (DBIR) thermal imaging at the Grass Valley Creek Bridges near Redding CA. DBIR thermal imaging is an enabling technology for rapid, reliable, bridge deck inspections while minimizing lane closures. bridge-deck inspections were conducted from a mobile DBIR bridge inspection laboratory during November 2-3, 1995. We drove this self-contained unit at limited highway speeds over 0.4 lane miles of bridge deck. Using two thermal IR bands, we distinguished delaminations from clutter. Clutter, or unwanted thermal detail, occurs from foreign materials or uneven shade on the bridge deck surface. By mapping the DBIR spectral- response differences at 3-5 {mu}m and 8-12 {mu}m, we removed foreign material clutter. By mapping the deck diurnal thermal inertia variations, we removed clutter from uneven shade. Thermal inertia is a bulk deck property, the square root of thermal conductivity x density x heat capacity. Delaminated decks have below-average thermal inertias, or above-average day-night temperature excursions. Compared to normal decks areas, delaminated deck areas were typically 2 or 3 {degrees}C warmer at noon, and 0.5{degrees}C cooler at night. The mobile DBIR bridge inspection laboratory is currently undergoing extensive testing to examine bridges by the Federal Highway Administration.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {11}
}

Conference:
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