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Walk-through Metal Detector Testing and the Need to Emulate Natural Body Motion



Nicholas G. Paulter Jr., Donald R. Larson, Nicklaus F. Troje


The effect of motion through the portal of a walk-through metal detector (WTMD) has often been considered to contribute to the uncertainty in detecting threat objects being carried through the WTMD. However, typical metrological testing uses a robotic system, or similar, to push a test object through the portal with a trajectory that is a straight line and has a constant velocity. This testing, although reproducible and accurate, does not present other than rectilinear trajectories. On the other hand, testing using clean testers, that is, people not carrying any metal objects other than the test object, is not reproducible or accurate because of the great variation between transits through the portal from any one clean tester. We report using a robotic system to accurately study the effect of non-straight-line trajectories of different velocities for the test object passing through the portal of the WTMD.
ASTM Journal of Testing and Evaluation


metal detector, natural body motion, rectilinear trajectory, detection performance testing, orientation, orientation effects, trajectory, walk-through metal detector


Paulter, N. , Larson, D. and Troje, N. (2018), Walk-through Metal Detector Testing and the Need to Emulate Natural Body Motion, ASTM Journal of Testing and Evaluation, [online], (Accessed June 23, 2024)


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Created July 5, 2018, Updated April 28, 2020