Variable frequency inductive proximity sensor
US5508662A · kind A · utility
10Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1995 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | Apr 4, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A proximity sensor includes a coil for sensing metal objects which are part of an oscillatory circuit and an oscillator which drives the oscillatory circuit at a constant frequency. A tuning device is connected in parallel with the oscillatory circuit. The tuning device is a variable gain amplifier with feedback via an inductive or capacitive impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.