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Imaging terahertz radar for security applications

Richter, Heiko and Semenov, Alexei and Böttger, Ute and Hübers, Heinz-Wilhelm (2008) Imaging terahertz radar for security applications. In: Terahertz for Military and Security Applications VI (Proceedings Volume), 6949, 694902 -694911. SPIE. SPIE Defense + Security, 2008-03-16, Orlando (USA). ISBN 9780819471406.

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Official URL: http://www.spie.org

Abstract

Detection of concealed threats is a key issue in public security. In short range applications, passive imagers operating at millimeter wavelengths fulfill this task. However, for larger distances, they will suffer from limited spatial resolution. We will describe the design and performance of 0.8-THz imaging radar that is capable to detect concealed objects at a distance of more than 20 meter. The radar highlights the target with the built-in cw transmitter and analyses the returned signal making use of a heterodyne receiver with a single superconducting hot-electron bolometric mixer. With an integration time of 0.3 sec, the receiver distinguishes a temperature difference of 2 K at the 20 m distance. Both the transmitter and the receiver use the same modified Gregorian telescope consisting from two offset elliptic mirrors. The primary mirror defines limits the lateral resolution of the radar to 2 cm at 20 m distance. At this distance, the field of view of the radar has the diameter 0.5 m. It is sampled with a high-speed conical scanner that allows for a frame time less than 5 sec. The transmitter delivers to the target power with a density less than ten microwatt per squared centimeter, which is harmless for human beings. The radar implements a sensor fusion technique that greatly improves the ability to identify concealed objects.

Document Type:Conference or Workshop Item (Speech)
Title:Imaging terahertz radar for security applications
Authors:
AuthorsInstitution or Email of Authors
Richter, HeikoUNSPECIFIED
Semenov, AlexeiUNSPECIFIED
Böttger, UteUNSPECIFIED
Hübers, Heinz-WilhelmUNSPECIFIED
Date:12 May 2008
Journal or Publication Title:Terahertz for Military and Security Applications VI (Proceedings Volume)
Volume:6949
Page Range:694902 -694911
Editors:
EditorsEmail
Jensen, J. OUNSPECIFIED
Cui, H.-L.UNSPECIFIED
Woolard, D. L.UNSPECIFIED
Hwu, R. J.UNSPECIFIED
Publisher:SPIE
Series Name:SPIE Proceedings
ISBN:9780819471406
Status:Published
Keywords:Radar, radar imaging, beam forming, antenna-coupled terahertz detectors
Event Title:SPIE Defense + Security
Event Location:Orlando (USA)
Event Type:international Conference
Event Dates:2008-03-16
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt sicherheitsrelevante Erdbeobachtung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr.rer.nat. Heiko Richter
Deposited On:26 Nov 2008
Last Modified:15 Jan 2010 00:30

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