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Proceedings Article

Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications

[+] Author Affiliations
Barry N. Behnken, Gamani Karunasiri

Naval Postgraduate School (USA)

Proc. SPIE 7117, Millimetre Wave and Terahertz Sensors and Technology, 711705 (October 02, 2008); doi:10.1117/12.800632
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From Conference Volume 7117

  • Millimetre Wave and Terahertz Sensors and Technology
  • Keith A. Krapels; Neil A. Salmon
  • Cardiff, Wales, United Kingdom | September 15, 2008

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 SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Barry N. Behnken and 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 (October 02, 2008); doi:10.1117/12.800632; http://dx.doi.org/10.1117/12.800632


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