METAL DETECTOR FOR LOCATING METAL OBJECTS

The invention relates to a method for locating metal or metal-containing objects and materials, currents in at least two emission coils being regulated in relation to each other such that a reception coil output signal received by at least one reception coil or average values of demodulation phases...

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Bibliographic Details
Main Author REIME GERD
Format Patent
LanguageEnglish
Published 21.11.2013
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:The invention relates to a method for locating metal or metal-containing objects and materials, currents in at least two emission coils being regulated in relation to each other such that a reception coil output signal received by at least one reception coil or average values of demodulation phases generated from the reception coil output signal are regulated in relation to each other continuously to be "zero" even when exposed to metal. The amplitude(s) of the required controlled variable(s) is/are detected as a value by demodulation, preferably at least at 0° and at a demodulation which is set off by 90° and is/are equalized, thereby improving the method such as to allow a reliable detection of an object to be detected even if other metal objects are present in the area of detection.
Bibliography:Application Number: US201213983412