Inductive proximity sensor for detecting ferrous and non-ferrous objects
US5519317A · kind A · utility
29Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1995 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | Mar 3, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An inductive proximity sensor has a resonant circuit including a sensing coil and driven by an oscillator at a predetermined frequency. To sense selectively ferrous and non-ferrous objects, the excitation frequency is a subcritical excitation frequency and discriminator logic is provided to process a phase-shift signal and a damping signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.