Operating method and coil arrangement for a magnetic sensor for detecting metallic objects in a subgrade
US9651702B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2010 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | May 19, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A coil arrangement for a magnetic sensor for detecting metallic objects in a subgrade, in particular structures made of concrete, brick, and wood, as well as a method for energizing and reading out this coil arrangement, is disclosed. The coil arrangement includes one or preferably two stacked outer main coils via which a perpendicular magnetomotive force of the subgrade is effected. Provided within the outer main coil(s) is, on the one hand, a quartet of a total of two pairs of parallel coils lying symmetrical to the axis of the main coil(s), via which a magnetomotive force penetration of the subgrade in two directions parallel to the subgrade surface is possible. To further improve the accuracy and reliability of localizing objects and estimating depth of cover, two pairs of smaller orthogonal coils each opposite from one another and also arranged symmetrically to the axis of the main coil(s) are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.