A review of magnetic sensors
Article Abstract:
There are a number of techniques used to produce magnetic sensors. Eleven of these techniques are search-coil magnetometer, which illustrates Farady's law of induction; flux-gate magnetometer, which consists of a ferromagnetic material wound with two coils; optically pumped magnetometer, based on the Zeeman effect; nuclear-precession magnetometer, which exploits the way the nuclei of atoms in a hydrocarbon fluid respond to a magnetic field; SQUID magnetometer, the superconducting quantum interference device, the most sensitive; Hall-Effect sensor, which exploits a physical phenomenon discovered by Edwin Hall over 100 years ago, magnetoresistive magnetometer, based on the magnetoresistive effect; magnetodiode, a semiconductor diode; magnetotransistor, an integrated silicon device; fiber-topic magnetometer, which uses two glass fibers arranged to form a Mach-Zender interferometer; and magneto-optical sensor, which exploits another effect discovered by Farady. All applications can be divided into three categories: high sensitivity, medium sensitive, and low sensitivity.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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Magnetic field of cylindrical surface currents
Article Abstract:
The magnetic field produced by surface currents flowing in one direction on an infinite surface can be treated as a bivector quantity, as justified by the Lorenz force. Bivector treatment of the field enables the establishment of the plane visual angle of the surface by means of the Biot-Savart law. Consequently, the magnetic field is uniform and has a value proportional to the plane visual angle when the current divides the vector space into two parts. Details and validation of the methodology are described.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1988
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Soft magnetic materials
Article Abstract:
The critical task of concentrating and shaping magnetic flux is performed by soft magnetic materials. The important characteristics for soft magnetic applications are high saturation induction, high permeability, low coercivity, and low core loss. Metallic glasses, an important new material, are made possible by rapid solidification technology. Using metallic glasses instead of conventional materials reduces core loss.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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