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

Author Affiliations +

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE