Claims
- 1. A proximity sensor, comprising:
a core with a cross-sectional shape including a head portion, two foot portions on opposite sides of the head portion and two leg portions each extending between one of the foot portions and the head portion; and a sensing coil positioned around the leg portions for allowing magnetic flux communication between the sensing coil and the core.
- 2. The proximity sensor of claim 1, wherein the cross-sectional shape of the core further comprises two tail portions, wherein each tail portion extend from an outer edge of one of the two foot portions, and wherein the tail portions are perpendicular to two foot portions.
- 3. The proximity sensor of claim 1, wherein the legs are elongated and extend transversely of the central part and the foot portions.
- 4. The proximity sensor of claim 1, wherein the head portion forms an substantially planar upper surface of the core and is perpendicular to the direction created by each of the two leg portions, the direction of the two leg portions being perpendicular to the direction of the two foot portions, the two foot portions lying in a common bottom surface plane, and wherein the two leg portions form an annular grove in the core that opens along side the upper surface of the core.
- 5. The proximity sensor of claim 1, further comprising a housing supporting the sensing coil and the core.
- 6. A proximity sensor, comprising:
a member having a top surface, a bottom surface, and a side surface having a width between the top and the bottom surfaces of the member, wherein the top surface is generally planar, and wherein the member defines a cavity that extends into the member from the top surface, wherein the top and the bottom surfaces have a thickness less than or equal to 0.06 inches; and a sensing coil positioned in the cavity for allowing magnetic flux communication between the sensing coil and the core.
- 7. The proximity sensor of claim 6, wherein the top and the bottom surfaces of the member have a thickness less than 0.06 inches and greater than or equal to 0.005 inches.
- 8. The proximity sensor of claim 6, wherein the member is constructed from a permeable material.
- 9. The proximity sensor of claim 6, wherein the member is generally cylindrical in shape.
- 10. The proximity sensor of claim 6, wherein the width of the member is in the range of 0.2 to 5 inches.
- 11. The proximity sensor of claim 6, wherein the top surface is spaced radially outwardly of the outer perimeter of the member.
- 12. A proximity sensor, comprising:
a core formed of a permeable material, the core having a generally planar top surface, a bottom, a side surface having a depth between the top and the bottom surface of the core, and an outer perimeter bounding the side surface of the core, the core defining a groove which extends into the core from the top surface of the core; a sensing coil positioned in the groove of the core; and an oscillator circuit coupled to the sensing coil for energizing the sensing coil to define a sensing region in relation to the sensing coil, the oscillator circuitry sensing an object in the sensing region based on the output signal of the sensing coil, the core and sensing coil being constructed so as to be operational to detect ferromagnetic, non-permeable or magnetic targets.
- 13. The proximity sensor of claim 12, wherein the oscillator circuit also energizes the sensing coil to create the sensing region of the core.
- 14. The proximity sensor of claim 12, wherein the oscillator circuit is formed of an eddy current kill oscillator circuit.
- 15. The proximity sensor of claim 12, wherein the oscillator circuit is formed of an eddy current loss all metal sensor circuit.
- 16. A method for detecting the presence of a magnetic object which comprises:
providing a core formed of a permeable material, the core having a generally planar top surface, a bottom, a side surface having a depth between the top and the bottom surface of the core, and an outer perimeter bounding the side surface of the core, the core defining a groove which extends into the core from the top surface of the core; providing at least one sensing coil positioned around the groove of the core; and measuring the impedance over the sensing coil, and if the impedance varies greater than a predetermined value, generating a signal to indicate the presence of the magnetic object.
- 17. The method of claim 16, wherein the top and the bottom surfaces of the core have a thickness less than 0.05 inches and greater than or equal to 0.02 inches.
- 18. The method of claim 16, wherein the core is generally cylindrical in shape.
- 19. A method for detecting the presence of a ferromagnetic object which comprises:
providing a core formed of a permeable material, the core having a generally planar top surface, a bottom, a side surface having a depth between the top and the bottom surface of the core, and an outer perimeter bounding the side surface of the core, the core defining a groove which extends into the core from the top surface of the core; providing at least one sensing coil positioned around the groove of the core; supplying an electronic signal to the sensing coil; and measuring the inductance over the sensing coil, and if the inductance varies greater than a predetermined value, generating a signal to indicate the presence of the ferromagnetic object.
- 20. The method of claim 19, wherein the top and the bottom surfaces of the core have a thickness less than 0.05 inches and greater than or equal to 0.02 inches.
- 21. The method of claim 19, wherein the core is generally cylindrical in shape.
- 22. A method for detecting the presence of a conductive object which comprises:
providing a core formed of a permeable material, the core having a generally planar top surface, a bottom, a side surface having a width between the top and the bottom surface of the core, and an outer perimeter bounding the side surface of the core, the core defining a groove which extends into the core from the top surface of the core; providing at least one sensing coil positioned around the groove of the core; supplying an electronic signal to the sensing coil; and measuring the inductance over the sensing coil, and if the inductance varies greater than a predetermined value, generating a signal to indicate the presence of the conductive object.
- 23. The method of claim 22, wherein the top and the bottom surfaces of the core have a thickness less than 0.05 inches and greater than or equal to 0.02 inches.
- 24. The method of claim 22, wherein the core is generally cylindrical in shape.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation-in-part of copending U.S. application Ser. No. 09/515,557, filed on Feb. 29, 2000, and titled “INDUCTIVE PROXIMITY SENSOR FOR DETECTING FERROMAGNETIC, NON-PERMEABLE OR MAGNET TARGETS.” Priority of the filing date of said copending application, the subject matter of which is specifically incorporated herein by reference, is claimed under the Paris Union Convention and 35 U.S.C. §120.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09515557 |
Feb 2000 |
US |
Child |
09796325 |
Feb 2001 |
US |