Abstract: An ultrasonic measurement device measures a volume-related quantity of a fluid flowing from a first zone to a second zone of the device. The device includes two ultrasound transducers emitting and receiving ultrasound signals and each disposed in one of the zones to define between them an ultrasound measurement path in the fluid. The device also includes a measurement electronics block that drives emission and reception of ultrasound signals by transducers, measures a physical magnitude characteristic of the propagation speed of said signals in the fluid and deduces the volume-related quantity of the fluid from these measurements and the geometry of the device. This determines the volume-related quantity of the fluid on the basis of measurements of a physical magnitude that is characteristic of the propagation speed of ultrasound signals in the fluid.

Abstract: The invention provides a fluidic oscillator which is symmetrical about a longitudinal plane of symmetry (P), the oscillator comprising means for generating an oscillating two-dimensional fluid jet, an obstacle provided in its front portion with a cavity that is swept by the oscillating jet, and a longitudinal element disposed in the empty space situated downstream from said obstacle in such a manner as to partially subdivide said space into two identical zones, and to form between them at least one communication channel for the fluid. The invention also provides a fluid flow meter including such a fluidic oscillator.