Directional resonance magnetometer
US5221897A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1991 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Jun 13, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
It is used for measuring a magnetic-field Hlex, which is the projection, in a given direction, of a field Hex and which incorporates a sample (2) containing resonant spins, first means (4) for exciting the resonance and detecting the latter, second means (32) for producing a polarization field Hb in accordance with the direction and compensating Hlex, processing and closed loop control means (6, 8, 16 to 20, 34 to 38, 48 to 52, 40, 44), which are connected to the first and second means and which make it possible to obtain voltages proportional to Hb-Ho+hlex and to Ho-Hb+Hlex in the vicinity of the resonance, Ho being the value of the field at resonance, with Ho being well above Hex, and a pulsed square-wave current for inducing Hb and for supplying a voltage proportional to Hlex in particular to the second magnetic means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.