Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1991-05-21
1993-03-16
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
324252, 505845, H01B 1202, G01R 33035, H01L 3916, H01L 3912
Patent
active
051948087
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.
REFERENCES:
patent: 4906607 (1990-03-01), Tyagi
patent: 5011818 (1991-04-01), Katoka et al.
Nakanishi et al., "Integrated DC-Squid Magnetometer", Japanese Journal of Applied Physics, vol. 26, No. 7, pp. 1050-1055.
Koba Masayoshi
Shintaku Hidetaka
Sharp Kabushiki Kaisha
Snow Walter E.
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