Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1992-06-05
1995-04-18
Chilcot, Jr., Richard E.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7317013, G01F 166, G01W 100
Patent
active
054068541
ABSTRACT:
An apparatus for measuring small liquid and particle currents on the high-frequency ultrasonic Doppler principle, has three sound transducers (5, 6, 7) directed jointly either in or against the direction of flow (2), distributed over the circumference of the measuring tube (1). One transducer (5) is a transmitter and the two others (6, 7) are receivers. Two mixers (16, 17) are inserted between the transmitter and the two receivers for producing a differential signal from the master frequency and receiving frequency. A third mixer (18) is provided for producing a signal from the differential signal from the first mixer (16) and the differential signal from the second mixer (17).
REFERENCES:
patent: 3675191 (1972-07-01), McAllister
patent: 4270191 (1981-05-01), Peynaud
patent: 4413531 (1983-11-01), Karplus et al.
patent: 5127409 (1992-07-01), Daigle
patent: 5208785 (1993-05-01), Brumley et al.
East German Journal "Messen, Steuern, Regeln", Berlin (1988), vol. 5, pp. 232 to 234.
British Journal "Medical and Biological Engineering", 1975, pp. 59 to 64.
Chilcot Jr. Richard E.
Oen William L.
Wagner Louise
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