G - Physics – 01 – S
Patent
G - Physics
01
S
349/33, 349/38
G01S 15/10 (2006.01) G01F 23/28 (2006.01) G01F 23/296 (2006.01) G01S 7/529 (2006.01)
Patent
CA 1238109
ABSTRACT Sonic and ultrasonic distance measuring device The sonic or ultrasonic distance measuring device used for example to measure the filling level in a container comprises an electroacoustic transducer which operates alternately as transmission transducer for the transmiss- ion of sonic or ultrasonic pulses and as reception transducer for the reception of the reflected echo pulses. Connected to the transducer is a signal processing circuit which includes an amplifier with controllable gain and a threshold value discriminator. A gain control circuit controls the gain of the amplifier during a predetermined period after the start of each transmission pulse in accordance with a stored function which is fixed in accordance with the dying-down behaviour of the trans- ducer so that the electrical reception signals originating from the dying-down of the transducer after amplification are smaller than the threshold value of the threshold value discriminator but are as close as possible to said threshold value. As a result the evaluation of echo pulses which occur during the dying-down of the trans- ducer is possible.
464594
Endress U. Hauser Gmbh U. Co.
Fetherstonhaugh & Co.
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