Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1973-12-26
1977-02-15
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
307 88P, 340347P, G01R 3302
Patent
active
040084329
ABSTRACT:
Apparatus for detecting an external magnetic field comprises a magnetic sensor which produces para-magnetic oscillations and includes an elongated member of an electrically conductive material and a thin magnetic film disposed thereabout. Alternative embodiments of the invention are presented in each of which the detection of an external magnetic field by the sensor results in a change in the oscillating state. In a first embodiment, the sensor is maintained normally in an oscillating state of a given domain and thus a given phase; when the sensor is subjected to an external magnetic field of appropriate intensity and polarity, the magnetization of the sensor shifts from the first domain to the second domain and accordingly there is produced a change or reversal in phase of the oscillatory output derived from the sensor. In that change of phase, the sensor output passes through a zero voltage value which is detected for providing an indication of the sensing of the external magnetic field. In an alternative embodiment, the exciting magnetic field normally maintains the state of magnetization in a first domain producing a non-oscillating state of the sensor; an external magnetic field has the effect of switching the magnetization to an oscillation domain; the sensor accordingly switches from a non-oscillating state to an oscillating state in response to sensing the external magnetic field.
REFERENCES:
patent: 3121565 (1964-02-01), Mentzer et al.
patent: 3197763 (1965-07-01), Fisher
patent: 3246219 (1966-04-01), Devol et al.
patent: 3453614 (1969-07-01), Bose
patent: 3718872 (1973-02-01), Takeuchi
patent: 3854086 (1974-12-01), Watanabe et al.
Oshima et al., High Sensitivity Plated-Wire Sensor Using Second Harmonic Oscillation, AEEE Trans. On Magn.; 9/1971, pp. 436-437.
Higurashi Minoru
Nishikawa Kyoichi
Ochiai Tatsushiro
Sugisaki Takao
Corcoran Robert J.
TDK Electronics Company Limited
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