Method for operating a sound measurement arrangement as well as sound measurement device

The present invention relates to a sound measuring device, preferably ultrasound measuring arrangement for detecting the flow rate of a fluid, wherein said sound measurement device (1) arranged with a cylindrical measuring tube (4) having an inner wall (4a) and outer wall (4b), an inside of the measuring tube (4) measuring channel (5) which can be traversed by the fluid, an annular transducer array (6 or 7), which serves as a transmitter of acoustic signals, an annular transducer array (7 or 6), which serves as a receiver of acoustic signals, wherein the annular transducer array (6 or 7), respectively the outside of the measuring tube (4) is disposed circumferentially, each of the transducer array (6, 7) generated sound signals pass through the fluid and serve the direction-dependent transit time differences of the sound signals of the determination of the flow rate, wherein an annular sound signal can be generated , the annular ultrasonic signal a guided rotationally symmetrical shaft (15a) in the measuring tube (4) couples, and wherein the guided rotationally symmetrical shaft (15a) of the measuring tube (4) coupled into the fluid in the measuring channel (5), through the wave energy of the guided rotationally symmetrical shaft (15a) caused in located the in the measuring tube (4) fluid volume compression shaft (16) can be generated from the inner wall (4a) of the measuring tube (4) at an oblique angle relative to the perpendicular to the surface of the inner wall (4a) of the measuring tube (4 ) is oriented in the measurement channel (3).