Vector measurement of a magnetic field
US6844726B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2001 |
| Grant date | Jan 18, 2005 |
| Priority date | — |
| Expiry date | Oct 17, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vectorial magnetometer (1), measures the components of a magnetic field in three directions (Oxyz) using a scalar magnetometer (2). The field is periodically modulated in each of the directions by generators (Gx, Gy, Gz) which have a specific frequency for each direction and that power coils (Ex, Ey, Ez). Synchronous demodulation of the of the output signal of the scalar magnetometer (2) for each of the three frequencies permits the relative continuous component of each axis to be found. The vectorial magnetometer (1) is characterized in that it has means (Dx D′x, Dy D′y, Dz D′z) that can carry out a double demodulation for phase and quadrature for each of the frequencies and processing means (70) that use the continuous component modules for phase and quadrature to calculate a transfer function of the scalar magnetometer at the frequency in question, and to apply this function to the correction of the components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.