Gradiometer apparatus with compensation coils for measuring magnetic fields
US5113136A · kind A · utility
80Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Jan 22, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus is provided for measuring a very weak magnetic field generated by a human body, etc. External magnetic noise components coming from other magnetic sources and existing around an object whose magnetic field is to be measured are detected by compensation coils of the apparatus. The compensation coils are oriented in multiple dimensional directions. The detected noise components are weighted and added to each other to correctly find the noise components. Thereafter, the noise components mixed in the objective very weak magnetic field are removed, thereby correctly measuring the very weak magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.