Separation frequency detection in a radar level gauge
US6842139B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2003 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Dec 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/284
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A separation frequency detector circuit and a method for detection of a separation frequency in a radar level gauge. A first circuit element (1) is arranged to receive a first clock frequency, and a second clock frequency. An instantaneous value of the first clock frequency will be transferred to and held at an output Q of the first circuit element (1) once each period of the second clock frequency. A predetermined value will be transferred to and held at an output Q of a second circuit element (3) triggered by the output Q of the first circuit element (1), and the predetermined value will be cleared from the output Q of the second circuit element (3) a predetermined time period after being triggered. An output is obtainable as a short pulse with a leading edge which will be synchronized with the first change of the leading signal edge of the first circuit element (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.