Optical phase difference range determination in liquid level sensor
US5291031A · kind A · utility
48Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Apr 6, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and electronic circuit for the measurement of fluid levels in containers. The circuit and apparatus constitute an instrument which measures fluid levels by optical means. Only light signals are used near the fluid itself. The instrument thus provides an intrinsically safe method of measuring fluid levels in the presence of explosive or flammable fluids, vapours or gasses, or in containers which must be electrically isolated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.