Eddy current type sensor for detecting conductor
US7612557B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 28, 2007 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Apr 27, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An eddy current type sensor for detecting a conductor includes a LC circuit and an oscillator. The LC circuit has a coil and a capacitor connected in parallel with the coil. The oscillator supplies an alternating current of a predetermined oscillation frequency to the LC circuit. A signal voltage outputted from the LC circuit has a first voltage when the distance between the coil and the conductor is minimum and a second voltage when the distance between the coil and the conductor is maximum. A voltage difference between the first and second voltages has a first difference at a first temperature and has a second difference at a second temperature. The first and second differences become equal to each other at a first frequency and a second frequency. The oscillation frequency is set close to the first frequency or the second frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.