Mode suppression in fluid meter conduits

Details Mode suppression in fluid meter conduits Mode suppression in fluid meter conduits

G - Physics

01

F

G01F 1/66 (2006.01)

Patent

CA 2157784

A fluid flow measurement arrangement is disclosed where the effects of high-order acoustic modes are suppressed in ultrasonic flow measurement. Ultrasonic transducers (2, 3) are arranged in a duct (4, 13) configured to carry a fluid. Ultrasonic signals between the transducers (2, 3) travel in a plurality of high order modes having velocities slower than a fundamental mode whose time of flight is desired to be determined with accuracy. A measurement portion between the transducers is adapted to suppress the effects of the non-fundamental modes, notably to suppress their propagation. Embodiments disclosed to achieve this suppression include inserting fluid dynamically configured obstructions (10; 11,12) (fig. 6, Fig. 7) within the measurement portion, and/or making the cross section of the measurement portion non-uniform (Figs. 15A, 15B).

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