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Proceedings Paper

Advanced ultrasonic measurement methodology for non-invasive interrogation and identification of fluids in sealed containers
Author(s): Brian J. Tucker; Aaron A. Diaz; Brian A. Eckenrode
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Paper Abstract

Government agencies and homeland security related organizations have identified the need to develop and establish a wide range of unprecedented capabilities for providing scientific and technical forensic services to investigations involving hazardous chemical, biological, and radiological materials, including extremely dangerous chemical and biological warfare agents. Pacific Northwest National Laboratory (PNNL) has developed a prototype portable, hand-held, hazardous materials acoustic inspection prototype that provides noninvasive container interrogation and material identification capabilities using nondestructive ultrasonic velocity and attenuation measurements. Due to the wide variety of fluids as well as container sizes and materials encountered in various law enforcement inspection activities, the need for high measurement sensitivity and advanced ultrasonic measurement techniques were identified. The prototype was developed using a versatile electronics platform, advanced ultrasonic wave propagation methods, and advanced signal processing techniques. This paper primarily focuses on the ultrasonic measurement methods and signal processing techniques incorporated into the prototype. High bandwidth ultrasonic transducers combined with an advanced pulse compression technique allowed researchers to 1) obtain high signal-to-noise ratios and 2) obtain accurate and consistent time-of-flight (TOF) measurements through a variety of highly attenuative containers and fluid media. Results of work conducted in the laboratory have demonstrated that the prototype experimental measurement technique also provided information regarding container properties, which will be utilized in future container-independent measurements of hidden liquids.

Paper Details

Date Published: 16 March 2006
PDF: 12 pages
Proc. SPIE 6178, Nonintrusive Inspection, Structures Monitoring, and Smart Systems for Homeland Security, 61780K (16 March 2006); doi: 10.1117/12.660439
Show Author Affiliations
Brian J. Tucker, Pacific Northwest National Lab. (United States)
Aaron A. Diaz, Pacific Northwest National Lab. (United States)
Brian A. Eckenrode, FBI Academy (United States)

Published in SPIE Proceedings Vol. 6178:
Nonintrusive Inspection, Structures Monitoring, and Smart Systems for Homeland Security
Aaron A. Diaz; H. Felix Wu; Steven R. Doctor; Yoseph Bar-Cohen, Editor(s)

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