Ultrasonic measuring arrangement for differential flow measureme

Details Ultrasonic measuring arrangement for differential flow measureme Ultrasonic measuring arrangement for differential flow measureme

1981-08-13

1983-10-18

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

73113, 73196, G01F 166

Patent

active

044098472

ABSTRACT:
A device for measuring a differential flow rate between a foward flow to a user station and a return flow from the user station, particularly well-suited for measuring fuel consumption in motor vehicles with a fuel return line extending between the carburetor or the injection pump and the fuel tank, includes a flow measuring chamber having an ultrasonic measuring arrangement. The flow measuring chamber is comprised of a forward flow tube portion and a return flow tube portion interconnected with one another along an ultrasonic wave path. Within the ultrasonic wave path, there is contained a partitioned wall means, permeable to ultrasonics, which serves to prevent flow communication between the two tube portions. First and second ultrasonic transducers are positioned at opposed ends of the ultrasonic wave path, the first transducer being formed on the forward tube portion and the second transducer being formed on the return tube portion. For measuring the differential flow rate, a first ultrasonic wave proceeds from the first transducer toward the second transducer and a second ultrasonic wave propagates from the second transducer toward the first transducer. The differential flow measurement derives from the difference in wave transit times between the first wave and the second wave.

REFERENCES:
patent: 4011753 (1977-03-01), Hausler
patent: 4079623 (1978-03-01), Erwin, Jr.
patent: 4351189 (1982-09-01), Gray et al.

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