Optical fibre measurement
US5162864A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1991 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | May 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/35
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Signal attenuation caused by a coating on an optical fibre is measured by feeding a length of the coated optical fibre into an integrating sphere assembly, forming within that part of the fibre within the sphere a loop of such a diameter that there is no risk of macrobending of the fibre and feeding the optical fibre out of the sphere to a detector. Light from a source is transmitted through the fibre and the power of the transmitted signal is continuously detected. The diameter of the loop is gradually decreased to cause macrobending of the fibre F and the strength of the light radiated through the coating by the macrobend in the fibre and collected and integrated by the sphere is monitored. The attenuation by the coating of the transmitted signal is determined from the discrepancy between the reduction of power of the transmitted signal and the increase in strength of the light radiated through the coating by the macrobend.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.