Metal Detectors

Paper Summary:

This paper explains that, since 9/11, countries with a high level of terrorism, such as Israel, use metal detectors, which were formerly used mainly in prisons, but are now used in airports and other public buildings. The author reports that there are three types of metal detectors in general use today, including walk-through, hand-held, and extended arm types. The paper relates that several newer technologies, such as back-scatter X-ray, millimeter wave analysis, and terahertz wave technology, are in various phases of development and deployment to supplement the basic equipment that has traditionally relied on magnetic induction fields and their interaction with electrically conductive and magnetically permeable materials.

From the Paper:

"Most metal detectors utilize an electromagnetic field generated by passing an electric current through a wire coil. In the case of walk-through metal detectors, the electromagnetic field is projected in the form of a wall between the borders formed by the equipment; hand-held devices project a circular field surrounding the length of the device. In the case of walk through detectors, subjects (and any potential targets) pass completely through the electromagnetic field, whereas hand-held devices are employed by passing them close enough to potential targets to come within the known dimensions of the magnetic field surrounding the device. Extended arm detectors function exactly the same as hand-held devices, except that their design allows them to be more easily deployed to bring their electromagnetic field closer to the ground for their specific use in detecting buried weapons or contraband."

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