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Proceedings Article

Diffuse reflection imaging at terahertz frequencies for security applications

[+] Author Affiliations
P. Dean, S. Khanna, S. Chakraborty, M. Lachab, A. G. Davies, E. H. Linfield

Univ. of Leeds (United Kingdom)

Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410R (October 08, 2007); doi:10.1117/12.739281
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From Conference Volume 6741

  • Optics and Photonics for Counterterrorism and Crime Fighting III
  • Colin Lewis
  • Florence, Italy | September 17, 2007

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.

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

P. Dean ; S. Khanna ; S. Chakraborty ; M. Lachab ; A. G. Davies, et al.
"Diffuse reflection imaging at terahertz frequencies for security applications", Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410R (October 08, 2007); doi:10.1117/12.739281; http://dx.doi.org/10.1117/12.739281


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