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:
Nov. 22, 2011
Filed:
May. 10, 2007
Jan Nilsson, Västerås, SE;
Jarl R. Sobel, Västerås, SE;
Jan Nilsson, Västerås, SE;
Jarl R. Sobel, Västerås, SE;
ABB AB, Västerås, SE;
Abstract
A method and device are provided for demodulation of an output signal from a transducer () driven by an alternating excitation signal having an excitation frequency. The transducer produces an amplitude-modulated output signal (y(t)) containing the quantity to be measured. The device has sampling units () to sample the output signal from the transducer and the output signal from the excitation unit, and a computation unit () to compute a first complex valued quantity () including information on the amplitude and phase of the output signal at the excitation frequency based on sampled values of the output signal from the transducer, compute a second complex valued quantity (Ū, Ī) including information on the amplitude and phase of the excitation signal at the excitation frequency based on sampled values of the excitation signal, forming a complex valued output quotient between the first and second complex valued quantities, and compute the demodulated output signal (O) based on the output quotient.