Beam shaping acoustic signal travel time flow meter

A device for measuring a flow speed of a fluid in a conduit with a travel time ultrasonic flow meter, comprising:

• a first connector for connecting a first ultrasonic wet transducer,
• a second connector for connecting a second ultrasonic wet transducer,
• a third connector for connecting a third ultrasonic wet transducer,
• a transmitting unit for sending impulse signals and for sending measuring signals,
• a receiving unit for receiving response signals,
• a processing unit for deriving a first measuring signal from a first inverted signal, for deriving a second measuring signal from a second inverted signal and for storing the first measuring signal and the second measuring signal,
• wherein the derivation of the first inverted signal and of the second inverted signal comprises reversing a signal portion of a response signal of a corresponding impulse signal or of a signal derived therefrom with respect to time,
• and wherein
• the transmitting unit is further operative to apply the first measuring signal to the first connector, and
• to apply the second measuring signal to the first connector,
• the receiving unit is further operative
• to receive a first response signal of the first measuring signal at the second connector, and
• to receive a second response signal of the second measuring signal at the third connector,
• and the processing unit is further operative to derive a flow speed of the fluid from at least one of the first response signal and the second response signal.