Patent ID: 9581572
Date: 2017-02-28
CPC Classifications: G01F,G01N

Claim:
1. A device for determining properties of a medium, comprising a hollow body accommodating the medium, a housing circumferentially surrounding the hollow body, wherein at least one portion of a wall of the hollow body is formed as a waveguide for acoustic surface waves, the portion forming an interface to the medium, at least one transmitter for exciting acoustic waves in the waveguide, and at least one receiver for receiving acoustic waves from the waveguide, at least one transmitter and at least one receiver are arranged at a distance from each other, wherein the transmitter and the receiver are in direct contact with an outer surface of the waveguide, wherein the distance between transmitter and receiver is chosen such that acoustic waves excited by the transmitter can at least partly propagate on paths extending through the medium, and at least one contact carrier on which at least one of the transmitter and the receiver are arranged, and wherein a continuous air gap is formed between the waveguide and the contact carrier, and a filling mass completely fills the space between the hollow body, the contact carrier and the housing with the exemption of the air gap, wherein the contact carrier is different from the filling mass.