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:
Mar. 16, 1993
Filed:
May. 21, 1991
Hidetaka Shintaku, Nara, JP;
Masayoshi Koba, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The superconductor magneto-resistive element 14 is installed in a center portion surrounded by two coils 15 and 16 which generate A.C. and D.C. bias magnetic fields respectively. The coils 15 and 16 are respectively connected to A.C. and D.C. power sources for applying A.C. and D.C. bias magnetic field to the element 14. With the output signal of the element 14, the fundamental component having the frequency component same as that of the A.C. bias magnetic field and the quadratic harmonic component having the frequency component twice as that of the fundamental component are calculated using the Fourier transform. The calculated value of the fundamental component is divided by the value of the quadratic harmonic component, thereby removing the change of the output signal of the element 14 due to the fluctuation inherent in the element 14, enabling to measure an external magnetic field with high accuracy.