Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1979-05-03
1981-06-09
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
042717086
ABSTRACT:
An ultrasonic measuring apparatus of the type having a pair of transducers disposed oppositely on a pipe through which a fluid to be measured flows and which are so controlled alternately as to convert an input electrical signal to an acoustic signal and to convert a received acoustic signal to a received electrical signal. The apparatus includes a time difference detecting means for receiving an output signal from a delay means and the received electrical signal for detecting a time difference between a delayed counting time obtained from the delay means and a propagating time required for an ultrasonic wave to propagate through the fluid to be measured. Comparing means are provided for comparing a voltage signal corresponding to the time difference with first and second set voltages and monitoring means receiving the comparison result from the comparing means for judging whether the fluid flow is propagated in the pipe in a normal condition or in an abnormal condition. The present invention ensures a quick detection of abnormal propagation of the ultrasonic wave in the pipe and obtains a correct measurement values without misjudgement.
REFERENCES:
patent: 3818757 (1974-06-01), Brown
patent: 3894431 (1975-07-01), Muston et al.
patent: 4028938 (1977-06-01), Eck
Kohno Masaru
Nakagawa Yukio
Fuji Electric & Co., Ltd.
Ruehl Charles A.
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