Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1985-08-12
1988-04-05
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73290V, 7386106, 73 53, G01F 166, G01F 1712, G01F 2328
Patent
active
047350970
ABSTRACT:
A method and apparatus for measuring fluid characteristics use a non-invasive ultrasonic system for generating spatially extended signals into a volume of a fluid and detecting said signals for measuring the characteristic of the fluid. The generated waves are Rayleigh-like surface waves creating, in effect, an extended aperture transducer from which the waves leak into the fluid. The Rayleigh-like surface wave operates in an environment wherein the plate or other structure on which the surface wave is generated has a thickness, normal to the primary direction of propagation of the wave, of less than four Rayleigh wavelengths and greater than approximately one-half of a Rayleigh wavelength. The extended aperture has a length of at least about ten Rayleigh wavelengths. The excitation for the system is generally a short pulse interrogation in order to avoid those interferences which may cause Lamb waves to be set up in the solid material. Several different configurations employing the Rayleigh-like surface wave are illustrated and discussed.
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Panametrics, Inc.
Ruehl Charles A.
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