Magnetic transducer comprising a strained magnetic wire in a sheath of non-magnetic material
AssigneeThomson-CSF
InventorsJean P. Castera, Jean M. Dupont
Life of this patent
Estimating the term…
Abstract
A magnetic transducer is disclosed which utilizes the magnetostrictive effect for creating an easy axis of magnetization in the longitudinal axis of a magnetic wire having a high cobalt content by bending the wire, which is then placed in a non-magnetic hollow tube. This tube is placed in the axis of a detection coil. The application of a magnetic field, alternately in one direction and the other in the longitudinal axis of the assembly creates a flux variation due to the magnetization change in the easy axis. The pulses detected have a high amplitude and a low rise time.
Claims7
A magnetic transducer using a strained magnetic material responsive to a magnetic field parallel to the longitudinal axis of said transducer, said transducer comprising a magnetic wire introduced into a rigid sheath of nonmagnetic material, the respective shapes of the wire and sheath being such that wire in its sheath is kept bent, thus creating longitudinal strains so as to produce in one area of the wire an easy direction of magnetization in accordance with the longitudinal axis of the wire, the magnetic wire-sheath assembly being positioned in a detection coil along the longitudinal axis thereof, which is to supply pulses during the momentary application of said magnetic field to the transducer, when said field induces a change to the magnetization in the magnetic wire from one direction to the other in accordance with the easy direction of magnetization.
Dependencies are inferred from the claim text.