| 摘要 |
The invention relates to an apparatus consisting of a device for generating a magnetic field mounted for movement relative to a product sitting in or moving through its field which is suspected of carrying at least one metal component which will cause the generator to move either toward or away therefrom because of either the attractive or repulsive forces, or both, caused by the presence of this metal or these metals. A load-responsive element in the form of a load cell is connected to the field generator so as to sense its movememnt if any and output a signal evidencing such movement. A detector is connected to receive the output signal from the load cell and use this information to initiate an appropriate response to the presence of the metal or metals causing the displacement of the generator. The invention also encompasses the method for detecting the presence of one or more metals, both ferrous and conductive, which will either attract or repel a generator of a magnetic field when within its field or moving through it. The resulting movement, if any, is detected by a load cell and used as an indication of the presence or absence of the metals causing displacement of the generator.
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