Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1973-08-16
1976-01-06
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3302
Patent
active
039315720
ABSTRACT:
This invention relates to methods of measuring magnetic fields and a magnetometer for performing the method.
According to the method an alternating magnetic field is applied to a thin magnetic film along its axis of difficult magnetization.
The alternating magnetic field applied to the film has an amplitude which is less than the anisotropy field of the film, the direction of magnetization of the film then undergoing an oscillation without reversal.
An electrical signal representing variations per unit of time of the magnetic induction in the film is withdrawn and analyzed and to effect the analysis the component of the magnetic field is measured at any of the odd harmonic frequencies of the electrical signal. The electrical signal is obtained by collecting the voltage at the terminals of a conducted loop surrounding the film and having its axis directed along the easy axis of the film.
REFERENCES:
patent: 3239754 (1966-03-01), Odom, Jr. et al.
patent: 3443213 (1969-05-01), Bader et al.
patent: 3619772 (1971-11-01), Ellis
patent: 3622873 (1971-11-01), Stine et al.
patent: 3628132 (1971-12-01), Fussell et al.
Abadeer et al., Magnetic Field Detection Using Coherent Magnetization Rotation in a Thin Film, Journ. of App. Phys., Vol. 42, No. 4. Mar. 15, 1971, pp. 1139-1140.
Chiron Guy
Debreuil-Monet Louis
Commissariat a l''Energie Atomique
Corcoran Robert J.
Stokes William D.
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