Coherent reflectometer
US4674872A · kind A · utility
10Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1984 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Apr 12, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3172
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical reflectometer in which the output from a laser 11 is passed through a ramped phase modulator 12 and an optical fibre bi-directional coupler 13 to a transmission path 15, e.g. an optical fibre. Part of the light is coupled out to a mirror 14 and is reflected to form a local oscillator signal which is mixed in the coupler with backscattered light from the fibre. The mixed signals are applied to a detector 16.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.