Measuring and testing – Volume or rate of flow – System
Patent
1975-06-27
1978-03-14
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 166
Patent
active
040784274
ABSTRACT:
An ultrasonic flow or current meter having at least one pair of transducers, a transceiver which applies a pulse signal to one of the transducers to produce an ultrasonic pulse wave, the other transducer receiving the ultrasonic pulse wave and producing the corresponding electrical signal, a reference pulse signal generator, a counter for counting the pulse signals from the reference signal generator in relation to the corresponding electrical signal, and a logical operational circuit. The logical operational circuit is supplied with the output signal from the counter and calculates a difference between a first reciprocal of a time required for the ultrasonic pulse wave to propagate from one of the pair of transducers to the other transducer and a second reciprocal of a time required for the ultrasonic pulse wave to propagate in the reverse direction between the pair of transducers, with the difference between the first and second reciprocals being multiplied by a constant.
REFERENCES:
patent: 3329017 (1967-07-01), Yamamoto et al.
patent: 3715709 (1973-02-01), Zacharias, Jr. et al.
patent: 3729993 (1973-05-01), Eck et al.
patent: 3869915 (1975-03-01), Baumoel
Suga Kazushi
Yoshida Yukio
Kabushikikaisha Tokyo Keiki
Ruehl Charles A.
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