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Proceedings Article

Active millimeter-wave imaging for concealed weapons detection

[+] Author Affiliations
Erich N. Grossman, Aaron J. Miller

National Institute of Standards and Technology (USA)

Proc. SPIE 5077, Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII, 62 (August 25, 2003); doi:10.1117/12.488198
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From Conference Volume 5077

  • Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII
  • Roger Appleby; David A. Wikner; Robert Trebits; James L. Kurtz
  • Orlando, FL | April 21, 2003

abstract

Actively illumniated mm-wave imaging systems for concealed weapons detection offer the possibility of much higher sensitivity than with passive systems. We discuss several issues specific to mm-wave imaging systems that are actively illuminated and describe our implementation of such a system. We show that the illumination geometry is critical to the appearance and detectability of targets, and present measurements of the bi-directional reflectance distribution of a small handgun, as a prototypical target. We demonstrate suppression of standing waves using frequency modulated (FMCW) illumination and directly compare images taken with CW, FMCW, and pulsed illumination. Our implementation of an active imaging system is based on a 120-element focal-plane array (FPA) of uncooled antenna-coupled microbolometers. We describe the fabrication process and yield for these FPA's, as well as tests that show the performance of individual pixels on the 120-element array to be equivalent to that of isolated devices. These results demonstrate that wiring for readout of an antenna-coupled FPA can be made "transparent" to the antennas. Therefore, a mm-wave FPA that is read out through wiring to the perimeter of the array constitutes a simple and feasibile architecture, in contrast to the infrared, where space limitations require vertical (3D) integration of readout and FPA. The electrical readout system for the FPA is also described. Finally, we present a result obtained with the full FPA system, showing that 3-way illumination is much more effective for detection of a complex target than a single directional illuminator.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Erich N. Grossman and Aaron J. Miller
"Active millimeter-wave imaging for concealed weapons detection", Proc. SPIE 5077, Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII, 62 (August 25, 2003); doi:10.1117/12.488198; http://dx.doi.org/10.1117/12.488198


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