Magnetic thin-film split-domain current sensor recorder
A sensor-recorder is described for recording a representation of the direction and peak amplitude of a transient current. A magnetic thin film is coated on a glass substrate under the influence of a magnetic field so that the finished film is magnetically uniaxial and anisotropic. The film is split into two oppositely magnetized contiguous domains with a central boundary by subjecting adjacent portions of the film simultaneously to magnetic fields that are opposed 180/sup 0/. With the split-domain sensor-recorder placed with the film plane and domain boundary either perpendicular or parallel to the expected conductive path of a transient current, the occurrence of the transient causes switching of a portion of one domain to the direction of the other domain. The amount of the switched domain portion is indicative of the amplitude of the peak current of the transient. The particular doman that is switched is indicative of the direction of the current. The resulting domain patterns may be read with a passive magnetic tape viewer.
- Assignee:
- Dept. of Energy
- Patent Number(s):
- None
- OSTI ID:
- 6342364
- Country of Publication:
- United States
- Language:
- English
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360101 -- Metals & Alloys-- Preparation & Fabrication
440300* -- Miscellaneous Instruments-- (-1989)
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450300 -- Military Technology
Weaponry
& National Defense-- Nuclear Explosion Detection
47 OTHER INSTRUMENTATION
ALLOYS
COATINGS
CURRENTS
DEPOSITION
DESIGN
DIMENSIONS
ELECTRIC CURRENTS
EXPLOSIONS
FILMS
IRON ALLOYS
MONITORING
NICKEL ALLOYS
NUCLEAR EXPLOSIONS
PERMALLOY
RECORDING SYSTEMS
SURFACE COATING
THICKNESS
TRANSIENTS
VAPOR DEPOSITED COATINGS