Radar level gauging system
US7532155B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2006 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Feb 6, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q13/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radar level gauging system comprising a microwave unit for transmitting and receiving first microwaves having a first and second distinguishable characteristics, a microwave absorber adapted to be arranged in a bottom region of the tank and adapted to absorb electromagnetic energy of microwaves having one of the first and second characteristics, and processing circuitry adapted to determine the product level based on a relationship between transmitted and received microwaves.The system thus emits microwaves in two channels, and the absorber is arranged to absorb energy in only one of the channels. Using the absorbed channel, it is possible to obtain a measurement with very limited interference from the bottom, which thus will be accurate also for levels close to the bottom. Using the unabsorbed channel, it is possible to obtain a reference measurement of the distance to the reflecting part of the absorber, thus enabling verification of the of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.