Sonic or ultrasonic distance measuring device

Details Sonic or ultrasonic distance measuring device Sonic or ultrasonic distance measuring device

1984-10-01

1987-06-23

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Material level detection, e.g., liquid level

367900, 367 99, 367 98, G01S 968

Patent

active

046758542

ABSTRACT:
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 transmission 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 transducer so that the electrical 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 transducer is possible.

REFERENCES:
patent: 3683324 (1972-08-01), Hoxsie
patent: 4204280 (1980-05-01), Slaton
patent: 4398423 (1983-08-01), Takahashi
patent: 4420824 (1983-12-01), Weber

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