Low cost sensing system and method employing anistropic magneto-resistive ferrite member
First Claim
1. A sensor comprising:
- a member of ferromagnetic ferrite material having anistropic magneto-resistive properties wherein the resistivity characteristics of the ferrite member vary in response to variations in the strength of a magnetic field applied longitudinally with respect to a selected longitudinal axis of the ferrite member;
means for impressing a magnetic field on the ferrite member which is indicative of a physical phenomenon to be measured with the magnetic lines of flux extending along a longitudinal axis of the ferrite member which exhibits variable magneto-resistive properties;
means for causing a flow of electric current through the said longitudinal axis of the ferrite member along a current path that extends in the same direction or opposite to the direction of the magnetic lines of flux; and
output means coupled to measure changes in the resistivity characteristics of the ferrite member as in indication of the value of a physical phenomenon being measured.
0 Assignments
0 Petitions
Accused Products
Abstract
A sensor comprising a member of ferromagnetic ferrite material having anistropic magneto-resistive properties wherein the resistivity characteristics of the ferrite member vary in response to variations in strength of a magnetic field applied longitudinally with respect to a selected longitudinal axis of the ferrite member. A magnetic field is impressed across the ferrite member with the magnetic lines of flux extending along the longitudinal axis of the ferrite member which exhibits variable magneto-resistive properties. A flow of electric current through the ferrite member along a current path that extends in the same direction or opposite to the direction of the magnetic lines of flux and changes in the value of the electric current flow through the ferrite member are measured as an indication of the value of a physical phenomena being sensed by the sensor.
37 Citations
32 Claims
-
1. A sensor comprising:
-
a member of ferromagnetic ferrite material having anistropic magneto-resistive properties wherein the resistivity characteristics of the ferrite member vary in response to variations in the strength of a magnetic field applied longitudinally with respect to a selected longitudinal axis of the ferrite member; means for impressing a magnetic field on the ferrite member which is indicative of a physical phenomenon to be measured with the magnetic lines of flux extending along a longitudinal axis of the ferrite member which exhibits variable magneto-resistive properties; means for causing a flow of electric current through the said longitudinal axis of the ferrite member along a current path that extends in the same direction or opposite to the direction of the magnetic lines of flux; and output means coupled to measure changes in the resistivity characteristics of the ferrite member as in indication of the value of a physical phenomenon being measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A sensor comprising:
-
a member of ferromagnetic ferrite material having anistropic magneto-resistive properties wherein the resistivity characteristics of the ferrite member vary in response to variations in the strength of a magnetic field applied longitudinally with respect to a selected longitudinal axis of the ferrite member; means for impressing a magnetic field on the ferrite member with the magnetic lines of flux extending along a longitudinal axis of the ferrite member which exhibits variable magneto-resistive properties; a constant current source of electric current connected to said ferrite member for causing a flow of electric current through the said longitudinal axis of the ferrite member along a current path that extends in the same direction or opposite to the direction of the magnetic lines of flux; and output means coupled to measure changes in resistivity of the ferrite member as an indication of the field strength of the magnetic field.
-
-
29. A method for utilizing the anistropic magneto-resistive properties of a ferromagnetic ferrite member for measuring physical properties such as current, voltage, magnetic field strength and the like;
- said method comprising;
impressing a magnetic field across the ferrite member with the magnetic lines of flux extending along a longitudinal axis of the ferrite member whose resistivity characteristics vary in response to variations in the strength of the applied magnetic field; applying an electric current flow through the ferrite member along a current path that extends along the said longitudinal axis either in the same direction or in an opposite direction to the direction of the magnetic lines of flux; and measuring the changes in resistivity of the ferrite member induced by the physical property to be measured as an indication of the value of the physical property. - View Dependent Claims (30, 31, 32)
- said method comprising;
Specification