Diffuse reflection imaging at terahertz frequencies for security applications

P. Dean; S. Khanna; S. Chakraborty; M. Lachab; A. G. Davies; E. H. Linfield

doi:10.1117/12.739281

8 October 2007 Diffuse reflection imaging at terahertz frequencies for security applications

P. Dean, S. Khanna, S. Chakraborty, M. Lachab, A. G. Davies, E. H. Linfield

Proceedings Volume 6741, Optics and Photonics for Counterterrorism and Crime Fighting III; 67410R (2007) https://doi.org/10.1117/12.739281
Event: Optics/Photonics in Security and Defence, 2007, Florence, Italy

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.

Citation Download Citation

P. Dean, S. Khanna, S. Chakraborty, M. Lachab, A. G. Davies, and E. H. Linfield "Diffuse reflection imaging at terahertz frequencies for security applications", Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410R (8 October 2007); https://doi.org/10.1117/12.739281

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