Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1991-09-30
1994-03-01
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
505846, G01R 33035
Patent
active
052911357
ABSTRACT:
A multichannel weak magnetic field measuring system for neuromagnetic diagnosis is provided having a plurality of dc-SQUID magnetometers. Bias current setting circuits are provided for detecting an even harmonic component of the output across the terminals of the corresponding SQUID and automatically adjusting a DC bias current to the SQUID. Accordingly, the level of the component becomes a predetermined value. Circuitry is also included for equalizing the magnetic flux detection sensitivities of these dc-SQUID magnetometers. Abnormal operation detecting circuits are also provided for producing abnormal operation detected outputs when the level of the corresponding even harmonic component is smaller than a certain threshold value.
REFERENCES:
patent: 3723755 (1973-03-01), Morse
patent: 4851776 (1989-07-01), Goto et al.
patent: 4977896 (1990-12-01), Robinson et al.
Journal of Low Temperature Physics, vol. 25, Nos. 1/2, pp. 99-144, Mar. 1. 6
"31-Channel DC SQUID Gradiometer Array for Biomagnetic Diagnosis", Abstracts of 1989 International Superconductivity Electronics Conference SS-1, (no month) 1989.
"Measurement of Somatosensory Evoked Magnetic Fields Induced by Electrical Simulation", The Journal of Japan Society of Applied Magnetism, vol. 13, No. 3, (no month) 1989, pp. 508-512.
Hotta Masao
Kado Hisashi
Makie Keiko
Director-General of the Agency of Industrial Science and Technol
Edmonds Warren S.
Hitachi , Ltd.
Strecker Gerard R.
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