Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1983-03-29
1984-11-20
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
044832028
ABSTRACT:
An ultrasonic flowmeter for measuring a flow rate in a conduit. A pair of ultrasonic transducers are disposed in a conduit so as to oppose each other such that a line connecting the pair of transducers is inclined by a predetermined angle with respect to a fluid flowing direction. The ultrasonic flowmeter includes: driving means for simultaneously driving the pair of ultrasonic transducers; means for measuring the primary time difference between a time when one ultrasonic transducer receives an ultrasonic wave which is radiated from the other ultrasonic transducer and a time when the other transducer receives an ultrasonic wave which is radiated from the first ultrasonic transducer. Additionally, a time difference between the time measured when one ultrasonic transducer receives an ultrasonic wave radiated from one ultrasonic transducer and reflected by the other ultrasonic transducer and a time measured when the other ultrasonic transducer receives an ultrasonic wave radiated from the other ultrasonic transducer and reflected by one ultrasonic transducer. Primary and secondary time difference data is produced by adding signs in accordance with the arrival order of the ultrasonic waves. Time difference data is used to calculate an actual flow rate of the fluid using data of the propagation time difference data.
REFERENCES:
patent: 3209591 (1965-10-01), Lester et al.
patent: 3918304 (1975-11-01), Abruzzo et al.
patent: 3935735 (1976-02-01), Lee
patent: 4052896 (1977-10-01), Lee et al.
patent: 4334434 (1982-06-01), Appel et al.
Itoh Ayao
Ogura Ichiro
Ruehl Charles A.
Tokyo Shibaura Denki Kabushiki Kaisha
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