2 October 2008 Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications
Author Affiliations +
Proceedings Volume 7117, Millimetre Wave and Terahertz Sensors and Technology; 711705 (2008); doi: 10.1117/12.800632
Event: SPIE Security + Defence, 2008, Cardiff, Wales, United Kingdom
Abstract
We report the use of a 160×120 pixel microbolometer camera, under illumination by a milliwatt-scale 3.6 THz quantum cascade laser, for real-time imaging of materials which are exclusively nonmetallic in character. By minimizing diffraction effects suffered by the camera system and operating the laser at bias currents approaching saturation values, an imaging scheme was developed in which overlapping samples of nonmetallic materials can be imaged with high fidelity and long persistence times. Furthermore, an examination of various security features embedded within domestic and foreign currency notes suggests that this imaging scheme could serve a future role in detection of assorted counterfeiting practices.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Barry N. Behnken, Gamani Karunasiri, "Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications", Proc. SPIE 7117, Millimetre Wave and Terahertz Sensors and Technology, 711705 (2 October 2008); doi: 10.1117/12.800632; https://doi.org/10.1117/12.800632
PROCEEDINGS
10 PAGES


SHARE
KEYWORDS
Terahertz radiation

Quantum cascade lasers

Microbolometers

Cameras

Millimeter wave imaging

Homeland security

Imaging systems

Back to Top