Electronic proximity sensor which is responsive to induced resistance
US4580097A · kind A · utility
4Cited by
6References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 23, 1984 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | May 23, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved electronic proximity sensor and crack detector that is primarily responsive to the induced resistance in a coil; including an LC resonating circuit that utilizes constant current and a DC power source. By sensing changes in the induced resistance, the invention detects various conditions of parts present and probe fault and can detect a crack in a rotating metal object that is in proximity with the probe. This is accomplished by sensing changes in the induced resistance that occur at the same frequency at which the metal object is rotating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.