Angular velocity indicating apparatus
US4001687A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1975 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Mar 10, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/481
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is an apparatus for generating a pulse train whose instantaneous repetition rate represents the instantaneous angular velocity of a rotating device. An oscillator feeds a high frequency signal to a coil through which a center pole of magnetic material projects. The rotating device causes an object such as a gear to rotate, at least a portion of the extremity of which (e.g., the tips of its teeth, in the case of a gear) repeatedly comes into close contact with the tip of the center pole, separated only by a small air gap. This results in a change in inductance of the coil, which amplitude modulates the oscillator output. The modulated output is passed through a peak voltage detector which generates the desired pulse train.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.