Accession Number:

ADA482112

Title:

1.56 Terahertz 2-Frames per Second Standoff Imaging

Descriptive Note:

Conference paper

Corporate Author:

MASSACHUSETTS UNIV LOWELL SUBMILLIMETER-WAVE TECH LAB

Report Date:

2008-01-01

Pagination or Media Count:

12.0

Abstract:

A Terahertz imaging system intended to demonstrate identification of objects concealed under clothing was designed, assembled, and tested. The system design was based on a 2.5 m standoff distance, with a capability of visualizing a 0.5 m by 0.5 m scene at an image rate of 2 frames per second. The system optical design consisted of a 1.56 THz laser beam, which was raster swept by a dual torsion mirror scanner. The beam was focused onto the scan subject by a stationary 50 cm-diameter focusing mirror. A heterodyne detection technique was used to down convert the backscattered signal. The system demonstrated a 1.5 cm spot resolution. Human subjects were scanned at a frame rate of 2 frames per second. Hidden metal objects were detected under a jacket worn by the human subject. A movie including data and video images was produced in 1.5 minutes scanning a human through 180 of azimuth angle at 0.7 increment.

Subject Categories:

  • Lasers and Masers
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE