Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1981-04-09
1983-09-06
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73900, G01F 166
Patent
active
044022310
ABSTRACT:
An ultrasonic flow rate measuring system in which a pulse of ultrasonic energy is emitted by a transducer placed on a pipe conducting the fluid to be metered, the energy being propagated through the fluid and being picked up by a second transducer at a different pipe position. The received signal burst includes a first pulsatory swing whose amplitude differs from subsequent swings, the signal burst being applied to the input of an amplifier having automatic-gain control. A clamp circuit coupled to the amplifier input is rendered operative immediately after the first swing is yielded in the amplifier output, the clamp acting to ground the input whereby the operative control level and the resultant gain of the amplifier is determined solely by the first swing.
REFERENCES:
patent: 2949772 (1960-08-01), Kritz
patent: 3090224 (1963-05-01), Rankin
patent: 3710621 (1973-01-01), Asada
patent: 4183244 (1980-01-01), Kohno et al.
Ebert Michael
Fischer & Porter Company
Ruehl Charles A.
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