Displacement transducer system
US4263546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Jul 5, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2405
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A displacement transducer system for providing a signal indicative of the position of a member, comprising a pair of voltage controlled oscillators the frequency of which is determined by a pair of variable reactance components, the reactance of one increasing while that of the other decreases as the member is moved in one direction and vice versa. The oscillators form part of a pair of phase locked loops to which an AC signal is supplied which depends upon the sum of the reactances of the comparator. The difference of the reactances is derived from the outputs of the oscillators and is used to control a counter which also is supplied with the AC signal. The count value of the counter indicating the difference of the reactances of the components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.