Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1984-12-27
1986-08-05
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
046035893
ABSTRACT:
An ultrasonic flowmeter for ultrasonically measuring physical parameters of a media flowing in a measuring path between two ultrasonic transducer circuits each including transmitting and receiving circuits, each including respective transducers. The measuring path has at least one component in the direction of flow and over which ultrasonic signals are sent alternately upstream and downstream. A detector connected to the receiving circuit operates to detect an envelope curve of the received ultrasonic signal. After detecting the envelope curve of the ultrasonic signal, the zero-crossing point of the envelope curve is determined electrically or arithmetically. The propagation period of ultrasonic waves is developed by defining the zero-crossing point as the beginning of receiving of the ultrasonic signal. Then, the velocity of flow and the volume of flow are calculated based on the propagation periods obtained from the envelope curve of the received ultrasonic signal.
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Transducers for Biomedical Measurements; Richard S. C. Cobbold; 1974, pp. 275-280.
Kabushiki Kaisha Toshiba
Ruehl Charles A.
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