Proximity sensor and method for determining the proximity to an electrically conductive body
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United States of America Patent
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Oct 6, 2015
Grant Date -
Sep 5, 2013
app pub date -
Feb 21, 2013
filing date -
Mar 1, 2012
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Abstract
A method for determining the proximity to an electrically conductive body comprises transmitting an alternating magnetic field at a selected frequency and registering an alternating magnetic field. Frequencies of the registered alternating magnetic field comprising the selected frequency and have an amplitude value above a predefined threshold value and are detected by a detection means. Utilizing a blocking circuit, frequencies of a predefined frequency band comprising the detected frequency or a plurality of predefined frequency bands comprising in each case one of the detected frequencies, are defined as blocked frequencies. A following frequency following the respective selected frequency and different from the selected frequency and the blocked frequencies is defined in a selection controller. The following frequency of a selected frequency is continuously selected as a newly selected frequency for a new time window following immediately after or chronologically spaced apart from a selected time window.
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