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Passive Terahertz Wave Imaging with a Single Bolometer and with a Bolometer Array

Semenov, Alexey and Richter, Heiko and Hübers, Heinz-WIlhelm and Zakosarenko, Vjatcheslav and May, Torsten and Anders, Susanne and Schultz, M. and Meyer, Hans-Georg and Kreysa, Ernst and Jethava, N. and Il'in, Konstantin and Siegel, Michael (2006) Passive Terahertz Wave Imaging with a Single Bolometer and with a Bolometer Array. In: International Forum on Terahertz Spectroscopy and Imaging. University of Kaiserslautern. 2nd Workshop on Teahertz Technology, 2006-03-01 - 2006-03-02, Kaiserslautern (Germany). (Unpublished)

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Abstract

Detection of concealed threats like guns, knifes or explosives is of prime importance at airports and other public places. Passive millimetre wave (mmW) imagers operating at frequencies up to almost 100 GHz have been demonstrated for this application. However with increasing distance to the object under investigation they suffer from limited spatial resolution and sensitivity. In this paper we demonstrate passive indoor imaging up to a distance of 7 m. For the initial experiments a Silicon bolometer cooled to 4.2 K was used as detector. The bolometer has a NEP of ~1.5 10-13 W/Hz1/2. It is sensitive in the range from 90 GHz to 3 THz. Images were taken with a mechanical scanner which moves the field of view of the detector across the object under investigation. Although it was possible to take images of hidden objects even at a distance up to 7 m a Silicon bolometer is not the optimal choice for imaging, because it is not a background limited detector and its response time is too large for real time video rate imaging. Also it is not a simple task to implement it into large format focal plane arrays (FPAs). To increase the imaging speed, we implemented a focal-plane array of millimeter-wave superconducting transition-edge sensors red out via superconducting quantum interference device current sensors. This decreased the acquisition time significantly.

Document Type:Conference or Workshop Item (Poster)
Title:Passive Terahertz Wave Imaging with a Single Bolometer and with a Bolometer Array
Authors:
AuthorsInstitution or Email of Authors
Semenov, AlexeyUNSPECIFIED
Richter, HeikoUNSPECIFIED
Hübers, Heinz-WIlhelmUNSPECIFIED
Zakosarenko, VjatcheslavInstitute for Physical High Technology, Jena, Germany
May, TorstenInstitute for Physical High Technology, Jena, Germany
Anders, SusanneInstitute for Physical High Technology, Jena, Germany
Schultz, M.Institute for Physical High Technology, Jena, Germany
Meyer, Hans-GeorgInstitute for Physical High Technology, Jena, Germany
Kreysa, ErnstMax-Planck Institute for Radioastronomy, Bonn, Germany
Jethava, N.Max-Planck Institute for Radioastronomy, Bonn, Germany
Il'in, KonstantinUniversity of Karlsruhe, Germany
Siegel, MichaelUniversity of Karlsruhe
Date:2 March 2006
Journal or Publication Title:International Forum on Terahertz Spectroscopy and Imaging
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Publisher:University of Kaiserslautern
Status:Unpublished
Keywords:terahertz waves, imaging, superconducting bolometer
Event Title:2nd Workshop on Teahertz Technology
Event Location:Kaiserslautern (Germany)
Event Type:international Conference
Event Dates:2006-03-01 - 2006-03-02
Organizer:University of Kaiserslautern (Germany)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt SOFIA (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Prof.Dr. Alexey Semenov
Deposited On:23 Oct 2006
Last Modified:27 Apr 2009 12:56

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