Apparatus for measuring a length of displacement
US4756621A · kind A · utility
3Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Sep 22, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for measuring a displacement of a movable member or a diameter of a cylindrical member comprises a photoelectric converting element array to convert light reflected by the surface of the member for producing an electric signal utilized to form a pattern information of the surface. The characterizing points of the pattern information are extracted and binarized into a binary pattern information which is compared with a reference pattern information. The difference between them is accumulated to determine the displacement. To measure a diameter the displacement thus obtained is divided by circular constant n.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.