Ultrasonic Doppler flowmeter

Details Ultrasonic Doppler flowmeter Ultrasonic Doppler flowmeter

1982-03-04

1984-03-27

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

044386524

ABSTRACT:
An ultrasonic Doppler flowmeter in which a received signal processing part includes a reference signal generator for generating a reference signal corresponding to the magnitude of a received signal, and a comparator for comparing the received signal with the reference signal. The reference signal varies in accordance with the magnitude of the received signal, and further may possess a hysteresis width corresponding to the output of the comparator. Therefore, a noise signal is effectively removed from the received signal at the comparator, and only a Doppler shift frequency is detected.

REFERENCES:
patent: 3449710 (1969-06-01), Moss, Jr.
patent: 3741014 (1973-06-01), Tamura
patent: 4122713 (1978-10-01), Stasz et al.
patent: 4198866 (1980-04-01), Birjukov et al.
patent: 4208908 (1980-06-01), Hickox

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