Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications
Behnken, Barry N.
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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.
The article of record as published may be found at http://dx.doi.org/10.1117/12.800632
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Real-time terahertz imaging using a quantum cascade laser and uncooled microbolometer focal plane array Behnken, Barry N. (Monterey, California: Naval Postgraduate School, 2008., 2008-06);Real-time imaging in the terahertz (THz) spectral range was achieved using an uncooled, 160x120 pixel infrared microbolometer camera and a milliwatt-scale quantum cascade laser (QCL). By replacing the camera's original ...
Behnken, Barry N.; Karunasiri, Gamani; Chamberlin, Danielle; Robrish, Peter; Faist, Jérôme (2007);Imaging in the terahertz regime (0.3-10 THz) is currently conducted primarily through the use of antenna-coupled semiconductor detectors or superconducting bolometers. These detection schemes are often bulky and unable to ...
Alves, Fabio (2014-06-03);There has been a continued interest in the terahertz (THz) imaging due to penetration through non-metallic objects and non-ionizing properties. Real-time imaging in this spectral range has been demonstrated using infrared ...