Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Patent
1996-10-09
1997-11-18
Eldred, J. Woodrow
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
340612, 340617, 340618, 73 1H, G01S 1308
Patent
active
056892659
ABSTRACT:
A level measuring device using microwaves comprises an antenna for sending transmitted waves toward the surface of a material whose level is to be measured, and for the reception of echo waves resulting from reflection at the surface, and a receiving and evaluating circuit which derives from the echo waves received by the antenna an echo function representative of the echo amplitudes as a function of the distance and determines from the echo function the transit time of the microwaves from the antenna to the surface of the material and therefrom the distance of the surface of the material from the antenna. In order to detect the formation of deposits of the material on the antenna or further trouble conditions, such as damage to the antenna or the loss thereof, the level measuring device comprises an arrangement which compares a section of the echo function originating from a reference reflection point in the antenna or in the vicinity of the antenna with a predetermined threshold value and produces a signal indicating the existence of a state above or below the said threshold value. The reference reflection point may be constituted by a part of the antenna or a separate reference reflector mounted in the antenna or in the vicinity thereof.
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Burger Stefan
Gerst Peter
Otto Johanngeorg
Eldred J. Woodrow
Endress & Hauser GmbH & Co.
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