Measuring and testing – Volume or rate of flow – System
Patent
1977-04-29
1978-07-04
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
73216, G01F 166
Patent
active
040981177
ABSTRACT:
An open channel flow transducer is provided for measurement of the flow of liquid in a sewer pipe or the like which is not always completely filled. A flow tube which may be of plastic has an upwardly extending discharge region connected to a sewer pipe, as by connection to the outlet opening of a sewer pipe which extends into a manhole or other access area. The flow tube therefore becomes filled with liquid before the liquid can be vertically discharged. A flow measuring transducer system is then connected in the flow tube to make a measurement of one or both the flow rate in the tube or the material flowing in the tube by ultrasonic measurement techniques. In one embodiment of the invention, transducers are mounted on the same side of the axis of the flow tube, and the exterior surface of the tube is provided with means to prevent the coherent internal reflection of ultrasonic energy from the interface of the outer tube diameter and the surrounding environment with the desired reflection of energy from the liquid and internal pipe diameter interface. In another embodiment of the invention, the transducers are on opposite sides of the tube and ultrasonic energy is transmitted between them without reflection from an internal wall.
REFERENCES:
patent: 2283906 (1942-05-01), Bennett
patent: 3633417 (1972-01-01), Montague
patent: 3906791 (1975-09-01), Lynnworth
patent: 3987674 (1976-10-01), Baumoel
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