Method and apparatus for determining the angular velocity of a shaft using a pair of proximity sensors
US5121054A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Jun 6, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tachometer particularly adapted for operation as a rotational velocity feedback transducer is provided. First and second proximity detectors are used to monitor orthogonal positions of an irregular surface portion of a rotating shaft and provide x and y signals that are substantially in quadrature. The x and y signals are differentiated with respect to time to provide differential signals that are representative of dx/dt and dy/dt, respectively. Signals representative of products x dy/dt and y dx/dt are generated from the x signal and the differential signal dy/dt, and the y signal and the differential signal dx/dt, respectively. A signal representative of algebraic sum x dy/dt--y dx/dt is generated from the signals representative of products x dy/dt and y dx/dt. A signal representative of quotient of (x dy/dt-y dx/dt) divided by the displacement r.sup.2 of the irregular surface portion is generated from the signal representative of algebraic sum (x dy/dt-y dx/dt) which signal is representative of the rotational velocity of the rotating shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.