Patent ID: 11953469
Assignee: BURKERT S.A.S.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A fluid measuring device for determining at least one characteristic property of a fluid, comprising:
a measuring tube having a fluid duct through which the fluid can flow and which has a measuring section in which the measuring tube is cylindrical on an inside and at least an area of a measuring tube wall is configured as a waveguide for surface acoustic waves which forms an interface to the fluid, and
at least one transmitter for exciting acoustic waves in the waveguide and at least one receiver for receiving acoustic waves from the waveguide which are arranged in direct contact with an outer surface of the waveguide,
wherein part of an energy of the acoustic waves excited by the transmitter is coupled into the fluid and propagates at least in sections as a volume wave through the fluid,
wherein the waveguide has at least two elongated waveguide paths, which are arranged offset by less than 180° along a circumference of the measuring tube, the volume wave propagating in the fluid between the two waveguide paths,
wherein a central area of the fluid duct is omitted by the volume wave,
wherein at least one of the waveguide paths, with respect to a center line thereof, extends at least in sections at an acute angle to a longitudinal extension direction of the measuring tube and in addition with a component in a circumferential direction, and
wherein in the area of the waveguide paths, the measuring tube wall has a smaller wall thickness than in areas of the measuring tube adjoining the waveguide paths.