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Proceedings Paper

Diffuse reflection imaging at terahertz frequencies for security applications
Author(s): P. Dean; S. Khanna; S. Chakraborty; M. Lachab; A. G. Davies; E. H. Linfield
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Paper Abstract

We report diffuse reflection imaging of concealed powdered samples in atmospheric air using a quantum cascade laser operating at 2.83 THz. The imaging system uses a helium-cooled silicon bolometer for mapping radiation diffusely reflected and scattered from samples, and a room-temperature pyroelectric sensor for simultaneously acquiring a specular image. A range of powders concealed within plastic packaging and standard FedEx envelopes was imaged with a resolution of better than 0.5 mm, and it was possible to detect powdered samples concealed within packaging from which there was a strong component of surface reflection. The feasibility of performing dual-wavelength diffuse reflection imaging for identification of illicit drugs and explosives is discussed.

Paper Details

Date Published: 8 October 2007
PDF: 9 pages
Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410R (8 October 2007); doi: 10.1117/12.739281
Show Author Affiliations
P. Dean, Univ. of Leeds (United Kingdom)
S. Khanna, Univ. of Leeds (United Kingdom)
S. Chakraborty, Univ. of Leeds (United Kingdom)
M. Lachab, Univ. of Leeds (United Kingdom)
A. G. Davies, Univ. of Leeds (United Kingdom)
E. H. Linfield, Univ. of Leeds (United Kingdom)


Published in SPIE Proceedings Vol. 6741:
Optics and Photonics for Counterterrorism and Crime Fighting III
Colin Lewis, Editor(s)

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