Ultrasonic flowmeter

An ultrasonic flowmeter for determining the flow rate of a medium, comprising:

• at least one ultrasonic transducer pair including:
• a first ultrasonic transducer;
• and
• a second ultrasonic transducer;
• wherein the first ultrasonic transducer and the second ultrasonic transducer are designed for transmitting and/or receiving ultrasonic signals;
• wherein the first ultrasonic transducer includes a first transducer housing and a first transducer element arranged in the first transducer housing for generating and/or for receiving ultrasonic signals;
• wherein the second ultrasonic transducer includes a second transducer housing and a second transducer element arranged in the second transducer housing for generating and/or receiving ultrasonic signals;
• and
• wherein the first transducer housing and the second transducer housing are designed to be at least partially capable of mechanical oscillation and are at least partially excited to mechanical oscillations for signal emission or signal coupling;
• and
• a control and evaluation unit for controlling the ultrasonic transducers and for evaluating a measurement signal characterizing the flow rate;
• wherein at least the first ultrasonic transducer has a first mechanical oscillation influencing element for influencing the oscillation behavior of the first ultrasonic transducer;
• wherein the first mechanical oscillation influencing element influences the oscillation behavior of the first ultrasonic transducer only mechanically by adding an additional mass;
• and
• wherein the first mechanical oscillation influencing element influences the oscillation behavior of the first ultrasonic transducer in such a manner that the natural frequencies of the first ultrasonic transducer are frequency-shifted relative to the natural frequencies of the second ultrasonic transducer such that the measurement signal characterizing the flow rate, which results from the transmitted ultrasonic signal passing through the first ultrasonic transducer and the second ultrasonic transducer, is more broadband than after passing through only one of the ultrasonic transducers.