Liquid monitoring
US4844870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1987 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Jul 17, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N35/1002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid monitoring system includes chamber structure with a monitoring region in which the liquid to be monitored is disposed, the monitoring region having two spaced wall portions and a supplemental wall portion. The system further includes a radiation source mounted adjacent one of the spaced wall portions or directing a beam of radiation along a horizontal path, and a sensor mounted adjacent the opposed wall portion for receiving radiation in a beam path. The incident radiation beam as it passes through the wall into the monitoring region is refracted at the region surface as a function of gas or liquid within the region. At a first refracting angle, the refracted beam impinges on the supplemental wall and is internally reflected, the reflected radiation passing along a reflected beam path and sensed by the detector to provide an indication of the fluid in the chamber. At a second refracting angle, the refracted beam is not reflected in a direction such that radiation from the source is sensed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.