Method for inductive distance measurement, and a working head for carrying out this method using an induction coil
US7075293B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2003 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Apr 8, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An inductive measurement is carried out of the distance between a workpiece (3) and a working head (1), which bears an induction coil (8), through which an alternating current flows and which is part of a resonance circuit whose oscillation frequency is monitored for changes which occur as a consequence of changes in the distance between the workpiece (3) and working head (1). In this case, the working head (1) acts on the workpiece (3) with a material (2) having a dielectric constant greater than 1. The frequency of the alternating current is in the megahertz region or just therebelow. Last but not least, the induction coil is screened from external electric fields in order to avoid the influence of parasitic capacitances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.