Optical shaft torsional displacement and speed sensing system
US4863274A · kind A · utility
9Cited by
9References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Feb 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotating shaft torsional displacement and speed detector provides a light beam which impinges on one or both ends of the rotating shaft. Different combinations of beam altering materials such as reflecting and non-reflecting surfaces, wave retarding plates, and linear polarizers are attached to the front shaft end and rear shaft end. These beam altering materials change either the polarization or magnitude of the light beam in a predictable manner that allows for the detection of shaft speed and torsional displacement of the front shaft end with respect to the rear shaft end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.