| 摘要 |
The invention relates to a proximity sensor and a method for determining the proximity to an electrically conductive body. By means of a transmitting arrangement, to this end an alternating magnetic field is transmitted at a selected frequency an alternating magnetic field registered by a receiving arrangement. Moreover, frequencies of the registered alternating magnetic field, which are outside a predefined frequency band comprising the selected frequency and have an amplitude value above a predefined threshold value, are detected by means of a detection means. In a control logic, by means of 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. Moreover, a frequency following the respective selected frequency and different from the selected frequency and the blocked frequencies, denoted hereinafter as the following frequency of the respectively selected frequency, is defined in a selection controller. By means of a time control of the control logic, 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 the selected time window.
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