Micromagnetometry detection system and method for detecting magnetic signatures of magnetic materials
US9389285B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 12, 2013 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | Jul 31, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/1269
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A micromagnetometry system for detecting the presence of very small quantities of magnetic particles comprises a first magnetic hybrid AMR/PHR multiring sensor using a Wheastone bridge electrical configuration, a first current source, a first voltage measurement device, a set of at least one magnetic particles deposited on the first magnetic sensor and a processing unit for detecting from a set of different measured differential voltages a magnetic flux shift representative of the presence of a least one deposited magnetic particle.The micromagnetometry system comprises means for creating a magnetic excitation field HAC to make produce by each motionless magnetic particle a stray magnetic field oscillating along the time at a constant frequency ω ranging from 10 Hz to 3 KHz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.