Device for reading by optical sensor coherence
US5058973A · kind A · utility
14Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1990 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Feb 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S372/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A reading device operates by the placing in interference of a reference signal, in the form of a fundamental wave train, with delayed wave trains constituting the useful signal. The device comprises an interferometer, a first branch (32) of which is traversed by at least said fundamental wave train (14), the first branch (32) being equipped, with means (37, 67, 87) for the generation of quantified delays of said fundamental wave train (14) with means (39) for the generation of a continuously variable delay of said fundamental wave train (14) over a range about each quantified delay value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.