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Proceedings Paper

HERMES: a high-speed radar imaging system for inspection of bridge decks
Author(s): Stephen G. Azevedo; Jeffrey E. Mast; Scott D. Nelson; E. T. Rosenbury; Holger E. Jones; Thomas E. McEwan; D. J. Mullenhoff; R. E. Hugenberger; R. D. Stever; John P. Warhus; Mel G. Wieting
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Paper Abstract

Corrosion of rebar in concrete bridges causes subsurface cracks and is a major cause of structural degradation that necessitates repair or replacement. Early detection of corrosion effects can limit the location and extent of necessary repairs, while providing long-term information about the infrastructure status. Most current detection methods, however, are destructive of the road surface and require closing or restricting traffic while the tests are performed. A ground-penetrating radar imaging system has been designed and developed that will perform the nondestructive evaluation of road-bed cracking at traffic speeds, i.e., without the need to restrict traffic flow. The first-generation system consists of an offset-linear array of 64 impulse radar transceivers and associated electronics housed in a trailer. Computers in the trailer and in the towing vehicle control the data acquisition, processing, and display. Cross-road resolution is three centimeters at up to 30 cm in depth, while down-road resolution depends on speed; 3 cm below 20 mph up to 8 cm at 50 mph. A two-meter-wide path is inspected on each pass over the roadway. In this paper, we describe the design of this system, show preliminary results, and lay out its deployment schedule.

Paper Details

Date Published: 13 November 1996
PDF: 10 pages
Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); doi: 10.1117/12.259137
Show Author Affiliations
Stephen G. Azevedo, Lawrence Livermore National Lab. (United States)
Jeffrey E. Mast, Lawrence Livermore National Lab. (United States)
Scott D. Nelson, Lawrence Livermore National Lab. (United States)
E. T. Rosenbury, Lawrence Livermore National Lab. (United States)
Holger E. Jones, Lawrence Livermore National Lab. (United States)
Thomas E. McEwan, Lawrence Livermore National Lab. (United States)
D. J. Mullenhoff, Lawrence Livermore National Lab. (United States)
R. E. Hugenberger, Lawrence Livermore National Lab. (United States)
R. D. Stever, Lawrence Livermore National Lab. (United States)
John P. Warhus, Lawrence Livermore National Lab. (United States)
Mel G. Wieting, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 2946:
Nondestructive Evaluation of Bridges and Highways
Steven B. Chase, Editor(s)

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