Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-06-14
1977-02-08
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3304
Patent
active
040074170
ABSTRACT:
The orthogonal flux gate thin film magnetometer comprising an orthogonal flux gate utilizing a rotation magnetization mechanism consisting of a sensing coil wound on a plated wire formed by applying to a conductor a ferromagnetic thin film, an alternating excitation power means for exciting the thin film of the flux gate, an amplitude difference detection circuit means for detecting a difference between positive and negative asymmetrical peak values of the output voltage of the flux gate, and a control means for feedback of the output of the detection circuit to the sensing coil of the flux gate through a feedback circuit and for supplying the output of the control means to an indicating means. The magnitude and the polarity of the external magnetic field are sensed from the feedback current which erases the external magnetic field applied to the flux gate.
REFERENCES:
patent: 2543843 (1951-03-01), Frosch
patent: 2752564 (1956-06-01), Ryerson
patent: 2870270 (1959-01-01), Nagai et al.
patent: 2942180 (1960-06-01), Coker
patent: 3239754 (1966-03-01), Odom, Jr. et al.
patent: 3718872 (1973-02-01), Takeuchi
Oshima et al, High Sensitivity Plated-Wire Senor, AEEE Trans. on Mag., Sept. 1971, pp. 436-437.
Ichioka Satoshi
Inoue Tadashi
Shirosaka Masaki
Takeuchi Shinjiro
Corcoran Robert J.
Mishima Kosan Co. Ltd.
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