Method and sensor unit for locating and/or detecting metallic or metal-containing objects and materials
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United States of America Patent
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Apr 5, 2016
Grant Date -
Sep 3, 2015
app pub date -
Oct 2, 2013
filing date -
Oct 2, 2012
priority date (Note) -
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Abstract
The method and sensor unit allow the location and detection of metallic or metal-containing objects and materials. A coil arrangement (1.2) comprises a transmission coil and a reception coil, which are arranged on top of one another, wherein the reception coil generates a reception coil output signal. A closed compensation control regulates the reception coil output signal in the receiving coil for compensating changes which occur in the detection range of the reception coil and influence the reception coil. To this end, compensation currents are fed into the receiving branch of the reception coil and are controlled relative to each other such that the reception coil output signal or average values which are detected from the reception coil output signal after demodulation are continuously regulated relative to each other to zero even in the case of metal influence. As a result, a coil with an unregulated transmission current can be used, in which a zero output signal is continuously generated. At the same time, the structural requirements for a compact structure of a sensor arrangement having a one-sided detection range are established.
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