Title:
超音波ドップラー流速計
Document Type and Number:
Japanese Patent JP4640627
Kind Code:
B2
Abstract:
An ultrasonic Doppler flow-meter comprises a substrate with a piezoelectricity, input- and output interdigital transducers formed on a first end surface of the substrate, and a signal analyzing unit connected between the input- and output interdigital transducers. A second end surface of the substrate is in contact with a liquid. The finger direction the output interdigital transducer is slanting to that of the input interdigital transducer. When an input electric signal with a carrier frequency f0 is applied to the input interdigital transducer, a leaky Lamb wave is excited in the substrate. The leaky Lamb wave is radiated into the liquid in the form of a longitudinal wave, which is reflected back by a material in the liquid. The reflected longitudinal wave is detected at the output interdigital transducer as a delayed electric signal with a Doppler frequency f. A moving speed of the material is sensed at the signal analyzing unit in terms of a frequency difference DELTAf between the carrier frequency f0 and the Doppler frequency f.
Inventors:
Koji Toda
Application Number:
JP25138599A
Publication Date:
March 02, 2011
Filing Date:
September 06, 1999
Export Citation:
Assignee:
Koji Toda
International Classes:
G01P5/00; G01F1/66
Domestic Patent References:
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| JP60216284A | ||||
| JP5087608A | ||||
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