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Fast high-resolution terahertz radar imaging at 25 meters

Cooper, Ken B. and Dengler, Robert J. and Llombart, Nuria and Talukder, Ashit and Panangadan, Anand V. and Peay, Chris S. and Mehdi, Imran and Siegel, Peter H. (2010) Fast high-resolution terahertz radar imaging at 25 meters. In: Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense. Proceedings of SPIE. No.7671. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 76710Y. ISBN 9780819481351. http://resolver.caltech.edu/CaltechAUTHORS:20180731-162730707

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Abstract

We report improvements in the scanning speed and standoff range of an ultra-wide bandwidth terahertz (THz) imaging radar for person-borne concealed object detection. Fast beam scanning of the single-transceiver radar is accomplished by rapidly deflecting a flat, light-weight subreflector in a confocal Gregorian optical geometry. With RF back-end improvements also implemented, the radar imaging rate has increased by a factor of about 30 compared to that achieved previously in a 4 m standoff prototype instrument. In addition, a new 100 cm diameter ellipsoidal aluminum reflector yields beam spot diameters of approximately 1 cm over a 50×50 cm field of view at a range of 25 m, although some aberrations are observed that probably arise from misaligned optics. Through-clothes images of concealed pipes at 25 m range, acquired in 5 seconds, are presented, and the impact of reduced signal-to-noise from an even faster frame rate is analyzed. These results inform the requirements for eventually achieving sub-second or video-rate THz radar imaging.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.850395DOIArticle
Additional Information:© 2010 Society of Photo-Optical Instrumentation Engineers (SPIE). The work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with United States Naval Explosive Ordnance Disposal Technology Division. Copyright 2010 California Institute of Technology. Government sponsorship acknowledged.
Funders:
Funding AgencyGrant Number
Naval Explosive Ordnance Disposal Technology DivisionUNSPECIFIED
Subject Keywords:terahertz imaging radar, standoff concealed weapons detection
Record Number:CaltechAUTHORS:20180731-162730707
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180731-162730707
Official Citation:Ken B. Cooper, Robert J. Dengler, Nuria Llombart, Ashit Talukder, Anand V. Panangadan, Chris S. Peay, Imran Mehdi, Peter H. Siegel, "Fast high-resolution terahertz radar imaging at 25 meters", Proc. SPIE 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense, 76710Y (26 April 2010); doi: 10.1117/12.850395; https://doi.org/10.1117/12.850395
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88413
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:01 Aug 2018 14:35
Last Modified:01 Aug 2018 14:35

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