Distance measuring gauge
US4215480A · kind A · utility
11Cited by
13References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1977 |
| Grant date | Aug 5, 1980 |
| Priority date | — |
| Expiry date | Dec 16, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hand held digital read-out measuring instrument in which interference fringes are generated by the transmission of radiations through gratings which move relative to one another according to a distance being measured and the fringes are counted to detect changes in the fringe pattern and generate a pulse output related to the distance, means being provided to control the rate of movement and to exert a substantially constant force on the movable elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.