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Proceedings Paper

Design of dual-road transportable portal monitoring system for visible light and gamma-ray imaging
Author(s): Thomas P. Karnowski; Mark F. Cunningham; James S. Goddard; Anil M. Cheriyadat; Donald E. Hornback; Lorenzo Fabris; Ryan A. Kerekes; Klaus-Peter Ziock; E. Craig Bradley; J. Chesser; W. Marchant
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Paper Abstract

The use of radiation sensors as portal monitors is increasing due to heightened concerns over the smuggling of fissile material. Transportable systems that can detect significant quantities of fissile material that might be present in vehicular traffic are of particular interest, especially if they can be rapidly deployed to different locations. To serve this application, we have constructed a rapid-deployment portal monitor that uses visible-light and gamma-ray imaging to allow simultaneous monitoring of multiple lanes of traffic from the side of a roadway. The system operation uses machine vision methods on the visible-light images to detect vehicles as they enter and exit the field of view and to measure their position in each frame. The visible-light and gamma-ray cameras are synchronized which allows the gamma-ray imager to harvest gamma-ray data specific to each vehicle, integrating its radiation signature for the entire time that it is in the field of view. Thus our system creates vehicle-specific radiation signatures and avoids source confusion problems that plague non-imaging approaches to the same problem. Our current prototype instrument was designed for measurement of upto five lanes of freeway traffic with a pair of instruments, one on either side of the roadway. Stereoscopic cameras are used with a third "alignment" camera for motion compensation and are mounted on a 50' deployable mast. In this paper we discuss the design considerations for the machine-vision system, the algorithms used for vehicle detection and position estimates, and the overall architecture of the system. We also discuss system calibration for rapid deployment. We conclude with notes on preliminary performance and deployment.

Paper Details

Date Published: 5 May 2010
PDF: 12 pages
Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 76651J (5 May 2010); doi: 10.1117/12.850191
Show Author Affiliations
Thomas P. Karnowski, Oak Ridge National Lab. (United States)
Mark F. Cunningham, Lawrence Livermore National Lab. (United States)
James S. Goddard, Oak Ridge National Lab. (United States)
Anil M. Cheriyadat, Oak Ridge National Lab. (United States)
Donald E. Hornback, Oak Ridge National Lab. (United States)
Lorenzo Fabris, Oak Ridge National Lab. (United States)
Ryan A. Kerekes, Oak Ridge National Lab. (United States)
Klaus-Peter Ziock, Oak Ridge National Lab. (United States)
E. Craig Bradley, Oak Ridge National Lab. (United States)
J. Chesser, Oak Ridge National Lab. (United States)
W. Marchant, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 7665:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI
Augustus Way Fountain III; Patrick J. Gardner, Editor(s)

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