Measuring and testing – Volume or rate of flow – System
Patent
1975-07-24
1977-01-18
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 166
Patent
active
040032523
ABSTRACT:
A fluid flowmeter for measuring the velocity of a fluid flowing along a path. The flowmeter comprises an enclosed housing having a fluid inlet and a fluid outlet; a liner having an inner wall surface positioned within the housing, the liner being fabricated from a material providing acoustical damping, e.g. polyurethane or rubber foam; and a plurality of acoustic wave transducers secured to the liner in notched portions of the liner inner wall surface. The transducers have inner wall surfaces dimensioned to provide with the inner wall surface of the liner a fluid flow conduit substantially devoid of protuberances and cavities, the transducers being mutually spaced along the fluid flow conduit by predetermined distances. Several embodiments are disclosed which employ both transducers having closed geometry, e.g. an annular or toroidal shape, and transducers having open geometry, e.g. toroidal segmental shape; and which employ different modes of operation, e.g. single or dual frequency wave generation and switched or continuous transducer operation.
REFERENCES:
patent: 1881543 (1932-10-01), Hartig et al.
patent: 2515221 (1950-07-01), Henning
patent: 2746291 (1956-05-01), Swengel
patent: 3109112 (1963-10-01), Lester
patent: 3357243 (1967-12-01), Woodcock
patent: 3751979 (1973-08-01), Ims
Ruehl Charles A.
The Institutes of Medical Sciences
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