| 摘要 |
This invention provides improved structure and detection methods for electromagnetic field ferromagnetic security detection stations of the type conventionally used at airports and the like. Improved sensitivity to ferromagnetic masses, such as knives or firearms carried by a person in the vicinity of the feet, ankles or lower legs is achieved by interosing a riser platform to assure that the person is introduced into the detection electromagnetic field above the floor or ground plane a predetermined distance that increases sensitivity of the detection of ferromagnetic msses carried by the person in the lower leg portion of the body. Even greter improvement in detectability is afforded by the requirement that the person stand in place at a position in the detection field affording more sensitive detection. The invention is simply used to retrofit field stations by introduction of a riser platform.
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