Optical sensing technique providing built in test
US5250805A · kind A · utility
4Cited by
8References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1991 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Jun 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P21/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical apparatus for sensing the motion of an object. A light source transmits light through a first and second optical fiber. The first and second optical fiber are positioned on opposite sides of a modulator or code disk to face each other along an optical path. The modulator has alternating reflective regions and transmissive regions which modulate the light propagating along the optical path as the modulator moves across the optical path. The modulated light is received by the first and second and optical fibers and transported to a predetermined location for evaluation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.