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US 5,488,778 AGranted
Electronic magnetometer and compass
OwnerBronson Potterinventor
Life of this patent
Estimating the term…
Abstract
An improved electronic magnetometer has a flux-concentrating core making grazing contact with a magnetically conductive element which is preferably part of a piezoelectric transducer. The core and transducer are mounted so as to make non-coherent, chattering contact when the transducer is caused to vibrate. A pickup coil attached to a signalling device enables a user to find a null in a field of magnetic flux with novel accuracy.
Claims52
An electronic magnetometer comprising
- a magnetically conductive element,
- a flux-concentrating core having a longitudinal axis, and
- a driver for causing relative vibration of said element and said core in a direction essentially parallel with said longitudinal axis,
- said core and said element being arranged for non-coherent, chattering contact during said vibration.
1 more element
An electronic magnetometer comprising
- a piezoelectric transducer comprising a piezoelectric crystal and a magnetically conductive element,
- a rod-shaped, pointed, flux-concentrating core, of high magnetic permeability material, having a longitudinal axis, and
- a coil in the vicinity of and perpendicular to said core to detect changing magnetic flux through said core,
- wherein said piezoelectric transducer and said core are arranged such that said magnetically conductive element and said core vibrate relative to each other, in a direction essentially parallel with said longitudinal axis, when an appropriate signal is applied to said piezoelectric crystal so as to make non-coherent, chattering contact, and
- said core and said element make grazing contact when not vibrating relative to each other.
2 more elements
An electronic magnetometer comprising
- a piezoelectric transducer comprising a piezoelectric crystal and a magnetically conductive element, a rod-shaped, pointed, flux-concentrating core of high magnetic permeability material, and
- a coil in the vicinity of and perpendicular to said core to detect changing magnetic flux through said core,
- wherein said piezoelectric transducer and said core are arranged such that said magnetically conductive element and said core vibrate relative to each other along a direction essentially parallel to the length of said rod-shaped core when an appropriate signal is applied to said piezoelectric crystal so as to make non-coherent, chattering contact at a single point of contact, and
- said core and said element make grazing contact when not vibrating relative to each other.
1 more element
An electronic magnetometer comprising
- a piezoelectric transducer comprising a piezoelectric crystal and a magnetically conductive element,
- a rod-shaped, pointed, flux-concentrating core of high magnetic permeability material, and
- a coil in the vicinity of and perpendicular to said core to detect changing magnetic flux through said core,
- wherein said piezoelectric transducer and said core are arranged such that said magnetically conductive element and said core vibrate relative to each other in a direction essentially parallel to the length of said rod-shaped core, other than by effect of gravitational forces, when an appropriate signal is applied to said piezoelectric crystal so as to make non-coherent, chattering contact, and
- said core and said element make grazing contact when not vibrating relative to each other.
2 more elements
An electronic magnetometer comprising
- a magnetically conductive element having a surface,
- a flux-concentrating core having a longitudinal axis perpendicular to said surface, and
- a driver for causing relative vibration of said element and said core in a direction essentially parallel to said longitudinal axis,
- said core and said element being arranged to make non-coherent, chattering contact during said vibration.
1 more element
An electronic magnetometer comprising
- a piezoelectric transducer comprising a piezoelectric crystal and a magnetically conductive element having a surface,
- a rod-shaped, pointed, flux-concentrating core, of high magnetic permeability material, having a longitudinal axis perpendicular to said surface, and
- a coil in the vicinity of and perpendicular to said core to detect changing magnetic flux through said core,
- wherein said piezoelectric transducer and said core are arranged such that said magnetically conductive element and said core vibrate relative to each other in a direction essentially parallel to the longitudinal axis when an appropriate signal is applied to said piezoelectric crystal so as to make non-coherent, chattering contact, and
- said core and said element make grazing contact when not vibrating relative to each other.
2 more elements
Dependencies are inferred from the claim text.