The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2016
Filed:
Jan. 13, 2012
Robert Jahns, Kiel, DE;
Reinhard Knoechel, Elmshorn, DE;
Eckhard Quandt, Heikendorf, DE;
Christian-Albrechts-Universitaet zu Kiel, Kiel, DE;
Abstract
A method for measuring a time-variant magnetic field using a magnetoelectric sensor having mechanical resonant frequency f, wherein the magnetic field has at least one component having harmonic time dependence with the measuring signal amplitude to be determined Hand the measuring signal frequency to be determined fin a known frequency interval f<f<f. The method includes: a. superimposing the magnetic field with a modulation magnetic field having harmonic time dependence with the known modulation amplitude Hand a selectable modulation frequency on the sensor, b. varying (wobbling) the modulation frequency over a complementary frequency interval determined by the known interval limits f, fand the resonant frequency of the sensor, c. measuring the sensor signal for each selected modulation frequency, d. searching for the at least one modulation frequency f, which results in a sensor signal in the mechanical resonance of the sensor, e. calculating the measuring signal frequency ffrom the previously determined modulation frequency fand from the resonant frequency of the sensor f, f. transmitting the sensor signal at the modulation frequency finto the superimposed magnetic field amplitude H, and g. calculating the measuring signal amplitude Hfrom the superimposed magnetic field Hand the modulation amplitude H.