Fiber optic level alarm
US5072616A · kind A · utility
7Cited by
13References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1989 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Jun 16, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for determining the level of water and/or steam in a boiler is disclosed. The device is a liquid level gauge (10) of the Blackburn type and utilizes an optical fiber cable (44) to intercept the light that passes in a relatively straight path through a cross passage (16) in the body (12) of gauge (10). Due to the difference in the indices of refraction of steam and water, the optical fiber cable (44) intercepts the light when steam is present in the gauge (10) but does not intercept the light when water is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.