Device for detecting vibrations including a multimode optical fiber as sensitive element
US4843233A · kind A · utility
35Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 9, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | May 9, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H9/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vibration detection device is provided having multimode optical fiber as sensitive element; a coherent light source; photodetecting means; means for analyzing the output of the photodetector means; a monomode optical fiber disposed between the coherent light source and the first end of the multimode optical fiber forming the input face thereof; and at least one optical fiber, whose core diameter is smaller than that of the multimode optical fiber, disposed between the other end of the multimode optical fiber, forming the output face thereof and on which a speckle appears, and the photodetector means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.