Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1994-02-07
1996-01-02
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Magnetometers
324244, 324209, G01R 3302
Patent
active
054811899
ABSTRACT:
The magnetic sensor of this invention is characterized by a magnet suspen on a torsion bar or wire and by a tunneling tip separated from one end of the magnet, a gap between the tip and the magnet that is small enough to support a tunneling current, an electrical source for imposing a constant biasing voltage across the gap, an electrical force to maintain the magnet and the tip sufficiently close so that a constant tunneling current is maintained therebetween, a feedback circuit to monitor current changes in the gap that result from rotation of the magnet due to changes in the surrounding magnetic field, and at least one recorder to record changes in the magnetic field. The method for detecting rotation of a magnet by a sensor caused by a change in the surrounding magnetic field includes the steps of biasing tunneling tip and a magnet with respect to each other, positioning the tip and/or magnet so there is a tunneling current therebetween, adjusting width of the tunneling gap to establish a constant tunneling current therebetween, exposing the magnet to a magnetic field that causes the magnet to rotate and to change the width of the gap, adjusting the width of the gap to re-establish a constant tunneling current in the gap, and recording the change in the feedback control voltage which is proportional to the change in the magnetic field.
REFERENCES:
patent: 4987303 (1991-01-01), Takase et al.
patent: 5103174 (1992-04-01), Wandass et al.
patent: 5290102 (1994-03-01), Kaiser et al.
patent: 5293781 (1994-03-01), Kaiser et al.
patent: 5315247 (1994-05-01), Kaiser et al.
patent: 5331589 (1994-07-01), Gambino et al.
patent: 5375087 (1994-12-01), Moreland et al.
Colton Richard J.
DiLella Daniel
Kap George A.
McDonnell Thomas E.
O'Shea Sandra L.
Patidar Jay M.
The United States of America as represented by the Secretary of
LandOfFree
Electron tunneling magnetic field sensor with constant tunneling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electron tunneling magnetic field sensor with constant tunneling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron tunneling magnetic field sensor with constant tunneling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-237934