Magnetic sensor with modulating flux concentrator having minimized air resistance for 1/f noise reduction
US6670809B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | May 1, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/96
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic sensing transducer device that senses low frequency magnetic fields by using flux concentrators that modulate the observed low frequency signal, thereby shifting this observed signal to higher frequencies and minimizing 1/f-type noise. This is accomplished by the oscillatory motion of a microelectromechanical (MEMS)-type magnetic flux concentrator operated with a magnetic sensor, preferably made on a common substrate. Such a combined device can be used in a magnetometer. Such a device is small, low-cost and has low-power-consumption requirements. The magnetic sensor can be a Hall effect or other type of magnetic sensor. At least one MEMS-type fabricated flux concentrator is used with the magnetic sensor. The concentrator oscillates at a modulation frequency much greater than the observed magnetic field being sensed by the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.