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10. Technology and Applications of Terahertz Imaging Non-Destructive Examination: Inspection of Space Shuttle Sprayed On Foam Insulation.

Author

Zimdars, David, Valdmanis, J. A., White, Jeffrey S., Stuk, G., Williamson, S., Winfree, William P., and Madaras, Eric I.

Subjects
SPACE shuttles, IMAGING systems, SCANNING systems, SYNTHETIC products, OPTOELECTRONIC devices
Abstract

The implementation of terahertz (THz) imaging for non-destructive evaluation shows great promise in 2 and 3 dimensional non-contact inspection of non-conductive materials such as plastics, foam, composites, ceramics, paper, wood and glass. THz imaging employs safe low power non-ionizing electromagnetic pulses, which produce images with lateral resolution <200 microns, and depth resolution <50 microns. We demonstrate the detection of voids and disbonds intentionally incorporated within the sprayed on foam insulation of a space shuttle external tank mock-up segment using time domain THz imaging. Recently, highly integrated turn-key THz imaging systems have been introduced commercially. An industrially hardened THz scanning system which has been deployed to scan the space shuttle tank with small remote THz transceiver on a 30 meter fiber optic umbilical, is described. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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11. TIME DOMAIN TERAHERTZ IMAGING OF THREATS IN LUGGAGE AND PERSONNEL.

Author

ZIMDARS, DAVID, WHITE, JEFFREY, STUK, G., SUCHA, G., FICHTER, G., and WILLIAMSON, S. L.

Subjects
TERAHERTZ spectroscopy, IMAGING systems, OPTOELECTRONIC devices, SCANNING systems, SECURITY systems, EXPLOSIVES, WEAPONS
Abstract

We demonstrate a large area time domain terahertz (THz) imaging system capable of scanning 1 meter square area in less than 20-100 minutes for several security applications. The detection of concealed explosives; metallic and non-metallic weapons (such as ceramic, plastic or composite guns and knives); and flammables in luggage, packages and personnel has been demonstrated. Transmission mode images of luggage containing threat items are discussed. Reflection mode images of luggage and personnel are discussed. Time domain THz images can be analyzed for 3 dimensional and volumetric information. Time domain THz images have advantages over coherent narrow band imaging methods, with freedom from interference artifacts and with greater ability to discard irrelevant or intervening reflections through time discrimination. [ABSTRACT FROM AUTHOR]

Published
2007
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