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

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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 ... continued below

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15 p.

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Del Grande, N. K.; Durbin, P.F.; Logan, C.M.; Perkins, D.E. & Schich, P.C. November 1, 1996.

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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.

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15 p.

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OSTI as DE97051355

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  • Proceedings of the Society of Photo-Optical Instrumentation Engineers (SPIE), Scottsdale, AZ (United States), 4-5 Dec 1996

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  • Other: DE97051355
  • Report No.: UCRL-JC--124359
  • Report No.: CONF-961219--3
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 461130
  • Archival Resource Key: ark:/67531/metadc674527

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  • November 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 30, 2015, 7:02 p.m.

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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, article, November 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc674527/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.