| 摘要 |
Device for the ultrasonic measurement of a volume amount of fluid (1) flowing from a first area (18) to a second area (22) within the device. The invention comprises two ultrasonic transducers (20, 24) providing and receiving ultrasonic signals, each disposed in one of said areas and together defining an ultrasonic measurement path in the fluid, and means for determining a volume amount of said fluid based on measurements of a physical quantity representative of the propagation speed of the ultrasonic signals in the fluid. The device further includes, on at least one part of the ultrasonic measurement path, two concentric tubes (26, 28) with a longitudinal axis (XX') defining a longitudinal space (30), and means (32, 34) enabling ultrasonic measurements to be performed in the longitudinal space (30) only.
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