Ultrasonic flowmeter and ultrasonic generator/detector
First Claim
1. An ultrasonic transducer for use in a gas flowmeter comprising:
- a case having an inner surface; and
a piezoelectric plate attached to the inner surface of the case, said piezoelectric plate to be covered with the case, wherein the piezoelectric plate is divided into a plurality of sections on a surface attaching to the inner surface of the case, the case is electrically conductive, and the case electrically connects among the divided surfaces of the plurality of sections.
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Accused Products
Abstract
An ultrasonic flowmeter includes a flow passage and an ultrasonic transducer for measuring the flow rate in the flow passage wherein the ultrasonic transducer is equipped with a piezoelectric material having electrodes on the opposed surfaces thereof, one of which is used as an ultrasonic wave transmitting/receiving surface and faces the flow passage. The lengths of the sides of the transmitting/receiving surface is so determined that the vibration in the electrode direction is the main mode, preferably that the ratio of the lengths of the sides of the transmission/reception surface to the thickness is not greater than 0.8. Consequently, because the flow meter uses the thickness longitudinal vibration of the piezoelectric material as the main mode, the ultrasonic transducer has a high sensitivity, a high speed response and a small size and the ultrasonic flow meter has a high accuracy and is compact.
41 Citations
38 Claims
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1. An ultrasonic transducer for use in a gas flowmeter comprising:
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a case having an inner surface; and
a piezoelectric plate attached to the inner surface of the case, said piezoelectric plate to be covered with the case, wherein the piezoelectric plate is divided into a plurality of sections on a surface attaching to the inner surface of the case, the case is electrically conductive, and the case electrically connects among the divided surfaces of the plurality of sections. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An ultrasonic transducer for use in a gas flowmeter comprising:
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a case having inner and outer surfaces;
a piezoelectric plate attached to the inner surface of the case, said piezoelectric plate to be covered with the case; and
a matching layer corresponding to the piezoelectric plate, wherein the piezoelectric plate is divided into a plurality of sections on a surface attaching to the inner surface of the case, and the matching layer is provided on the outer surface of the case. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification