Position detector apparatus and method utilizing a transient voltage waveform processor
US5198764A · kind A · utility
13Cited by
15References
43Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1991 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Feb 22, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position detection method and apparatus is disclosed which utilizes an electromagnetic probe as the control element in a relaxation oscillator circuit. The probe is energized by a pulse voltage waveform and the decay time of the induced transient probe voltage is utilized to modulate the frequency of the pulse generator. The probe transient voltage decay time is influenced by the proximity of an electrically conductive or magnetic object. Therefore, a frequency output is generated which indicates the position of the conductive or magnetic object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.