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Proceedings Paper

Passive stand-off terahertz imaging with 1 hertz frame rate
Author(s): T. May; G. Zieger; S. Anders; V. Zakosarenko; M. Starkloff; H.-G. Meyer; G. Thorwirth; E. Kreysa
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Paper Abstract

Terahertz (THz) cameras are expected to be a powerful tool for future security applications. If such a technology shall be useful for typical security scenarios (e.g. airport check-in) it has to meet some minimum standards. A THz camera should record images with video rate from a safe distance (stand-off). Although active cameras are conceivable, a passive system has the benefit of concealed operation. Additionally, from an ethic perspective, the lack of exposure to a radiation source is a considerable advantage in public acceptance. Taking all these requirements into account, only cooled detectors are able to achieve the needed sensitivity. A big leap forward in the detector performance and scalability was driven by the astrophysics community. Superconducting bolometers and midsized arrays of them have been developed and are in routine use. Although devices with many pixels are foreseeable nowadays a device with an additional scanning optic is the straightest way to an imaging system with a useful resolution. We demonstrate the capabilities of a concept for a passive Terahertz video camera based on superconducting technology. The actual prototype utilizes a small Cassegrain telescope with a gyrating secondary mirror to record 2 kilopixel THz images with 1 second frame rate.

Paper Details

Date Published: 15 April 2008
PDF: 8 pages
Proc. SPIE 6949, Terahertz for Military and Security Applications VI, 69490C (15 April 2008); doi: 10.1117/12.777952
Show Author Affiliations
T. May, Institute of Photonic Technology (Germany)
G. Zieger, Institute of Photonic Technology (Germany)
S. Anders, Institute of Photonic Technology (Germany)
V. Zakosarenko, Institute of Photonic Technology (Germany)
M. Starkloff, Institute of Photonic Technology (Germany)
H.-G. Meyer, Institute of Photonic Technology (Germany)
G. Thorwirth, Jena-Optronik GmbH (Germany)
E. Kreysa, Max Planck Institute for Radio Astronomy (Germany)

Published in SPIE Proceedings Vol. 6949:
Terahertz for Military and Security Applications VI
James O. Jensen; Hong-Liang Cui; Dwight L. Woolard; R. Jennifer Hwu, Editor(s)

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