Detecting disturbance using optical gap sensing
US5061846A · kind A · utility
8Cited by
18References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1989 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | May 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H9/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for detecting minute disturbance such as seismic vibrations or the like which utilizes an optically clear gap material as the primary sensing element. The gap material is subjected to the disturbance and any reactive change in width or index is sensed optically by monitoring the light transmission properties of the gap material. A particular type of sensor is disclosed consisting of a length of optic fiber having the tip end covered by the gap material with the distal surface bearing a reflective coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.