Apparatus for detecting position of a rotating element using a two-grating moire pattern
US4775788A · kind A · utility
7Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1986 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Oct 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/37131
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The position and motion of a rotating element is determined by using a two-grating moire pattern. Movement of the element causes a projected scale image representing radiation reflected from the element to shift relative to a fixed grating thereby generating moire fringes. The accumulated fringes serve to measure absolute position and motion of the element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.