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US 6,684,696 B2Granted
Filling-level measuring device that evaluates echo signals
AssigneeVEGA Grieshaber KG
InventorDaniel Schultheiss
Life of this patent
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Abstract
A filling-level measuring device, specifically a filling-level radar system, comprises a transmitter (1), a receiver (2) for an echo of a signal emitted by the transmitter (1), and an evaluation circuit (3) for estimating the filling level. The transmitter (1) and the receiver (2) are suitable for operation with a plurality of frequencies on the part of the emitted signal and the echo.
Claims13
A filling-level measuring device with:
- a transmitter adapted to periodically emit signals at one of a plurality of frequencies (fafb . . . ),
- a receiver adapted to receive corresponding echos of the signals periodically emitted by the transmitter at the one of the plurality of frequencies (fafb . . . ),
- an evaluation circuit for measuring a filling level on the basis of transit times of different portions of the echos, and
- selector means for cyclically setting the transmitting and receiving frequency to another one of the plurality of frequencies, and
- wherein the evaluation circuit periodically receives echos corresponding to all frequencies (fafb . . . ) emitted by the transmitter to calculate the filling level therefrom.
2 more elements
A filling-level measuring device with:
- a transmitter adapted to emit signals having a plurality of frequencies (fa, fb . . . );
- a receiver adapted to receive echos corresponding to each of the plurality of emitted signal frequencies (fa, fb . . . ) emitted by the transmitter;
- an evaluation circuit for measuring a filling level on the basis of transit times of different portions of the echos,
- wherein the evaluation circuit, in estimating a filling level, takes into account those portions of the echos that occur for at least two frequencies.
1 more element
Dependencies are inferred from the claim text.