Passive terahertz camera for standoff security screening
2010; Optica Publishing Group; Volume: 49; Issue: 19 Linguagem: Inglês
10.1364/ao.49.00e106
ISSN0003-6935
AutoresErich N. Grossman, Charles Dietlein, Juha Ala‐Laurinaho, Mikko Leivo, Leif Grönberg, Markus Grönholm, Petteri Lappalainen, Anssi Rautiainen, Aleksi Tamminen, Arttu Luukanen,
Tópico(s)Thermal Radiation and Cooling Technologies
ResumoWe describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a 2 m x 4 m (vertical x horizontal) field of view (FOV) at a standoff range of 8 m. The focal plane array is cooled to 4 K in a closed cycle refrigerator, and the signals are detected on free-standing bridges of superconducting Nb or NbN at the feeds of broadband planar spiral antennas. The NETD of the focal-plane array, referred to the target plane and to a frame rate of 5 s(-1), is 1.25 K near the center of the array and 2 K overall.
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