Fast high-resolution terahertz radar imaging at 25 meters
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.
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.Attached Files
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Additional details
- Eprint ID
- 88413
- Resolver ID
- CaltechAUTHORS:20180731-162730707
- Naval Explosive Ordnance Disposal Technology Division
- Created
-
2018-08-01Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 7671