Guided wave radar level transmitter with automatic velocity compensation
US6867729B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2003 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Nov 3, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/0209
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A guided wave radar transmitter comprises a probe defining a transmission line including a relatively low impedance target marker above an expected sensing region of the probe. A pulse circuit is connected to the probe for generating pulses on the transmission line and receiving a reflected signal from the transmission line. The reflected signal selectively includes a target pulse representing the target marker and a level pulse representing material along the length of the probe. A controller is operatively connected to the pulse circuit. The controller normally operates at a relatively low gain to determine a level time to the level pulse to determine material level, and periodically operates at a relatively high gain to determine a target time to the target pulse. The target time is used to compensate the level time for properties of vapor above the material level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.