Resonant magnetometer device
First Claim
Patent Images
1. A resonant magnetometer comprising:
- an oscillatory member; and
means for passing an alternating current (AC) through said oscillatory member for imparting an oscillatory force on said member, wherein a driver is additionally provided to impart a magnetic field independent oscillatory force to said oscillatory member, said driver including an amplifier having an input based upon an output from a sensor, said sensor providing an electrical output signal dependent on the deflection of the oscillatory member, and wherein the alternating current is derived directly from the oscillation of the oscillatory member without using a separate frequency generator source thereby implementing a positive feedback self resonant drive signal to the oscillatory member.
2 Assignments
0 Petitions
Accused Products
Abstract
A resonant magnetometer comprises a substrate having a member and circuitry for passing an alternating current (AC) through the member. The magnetometer is characterized in that a driver is also provided to impart a magnetic field independent oscillatory force to the member. Disclosed is a micro-electro mechanical systems (MEMS) implementation of a magnetometer.
-
Citations
29 Claims
-
1. A resonant magnetometer comprising:
-
an oscillatory member; and means for passing an alternating current (AC) through said oscillatory member for imparting an oscillatory force on said member, wherein a driver is additionally provided to impart a magnetic field independent oscillatory force to said oscillatory member, said driver including an amplifier having an input based upon an output from a sensor, said sensor providing an electrical output signal dependent on the deflection of the oscillatory member, and wherein the alternating current is derived directly from the oscillation of the oscillatory member without using a separate frequency generator source thereby implementing a positive feedback self resonant drive signal to the oscillatory member. - 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. A resonant magnetometer comprising an oscillatory member and means for passing an alternating current (AC) through said oscillatory member, wherein a driver is additionally provided to impart a magnetic field independent oscillatory force to said oscillatory member, the magnetometer further comprising a sensor for providing an electrical output signal dependent on the deflection of the oscillatory member, the sensor comprising a plurality of substrate electrodes comprised of elongate sensor electrodes located on a substrate interdigitated with a plurality of oscillatory member electrodes comprised of elongate sensor electrodes on said oscillatory member, said substrate electrodes and said oscillatory member electrodes comprising a variable capacitor.
Specification