Radar level gauging with wait state
US10746585B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2017 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Jul 20, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/35
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radar level gauge for determining a process variable of product in a tank, having processing circuitry configured to process a tank signal and, when no surface echo can be identified, enter a wait state. The wait state includes a) storing the tank signal in memory, b) obtaining a wait state tank signal, c) comparing the wait state tank signal with the stored tank signal to determine a tank signal difference measure, d) repeating steps b) and c) until the tank signal difference measure is greater than a predefined threshold, e) processing the wait state tank signal to identify a surface echo, and f) when no surface echo can be identified in the wait state tank signal, setting an alarm.By storing the tank signal when the wait state is entered, it is therefore possible to defer an alarm until the tank signal deviates from this stored tank signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.