Multi-coil eddy current proximity probe system
US6803757B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Oct 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2053
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A proximity probe system comprising a multi-coil proximity probe including a drive coil, a sense coil and a reference coil. The system includes a signal generator driving the drive coil with an alternating current for creating a magnetic field that induces eddy currents in a proximate conductive object resulting in an eddy current induced magnetic field emanating therefrom. The sense coil is interposed between the object and the drive coil for outputting an object induced alternating current that is detected by the system and correlated to a position of the object relative to the probe. The reference coil is positioned to be inductively coupled to the drive coil for carrying a drive coil induced alternating current that is detected, conditioned and feedback to the signal generator for controlling the magnetic field radiating from the drive coil while sensing the the object induced alternating current in the sense coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.