Clamp-on ultrasonic flowmeter and method for adjusting transducer elements using an adjusting device having at least two degrees of freedom

A clamp-on ultrasonic flowmeter comprising:

• a measuring tube for guiding a medium;
• a pair of ultrasonic contact transducers which, along a measuring tube axis, are arranged on the measuring tube offset from each other;
• an electronic measuring/operating circuit for operating the ultrasonic contact transducers and for generating flow measurement values of the medium,
• wherein each ultrasonic contact transducer has at least one transducer element for generating and detecting ultrasonic signals and a coupling element,
• wherein the transducer element is located on a first side of the coupling element, said side facing away from the measuring tube, and wherein the coupling element is designed to be acoustically coupled to the measuring tube via a second side of the coupling element, said second side facing the measuring tube, and to transmit ultrasonic signals between the transducer element and measuring tube and vice versa,
• wherein the ultrasonic flowmeter, for at least one first ultrasonic contact transducer of the pair, has an adjusting device for adjusting the ultrasonic contact transducer,
• wherein the adjusting device is arranged between the transducer element and the first side of the coupling element or between the measuring tube and the second side of the coupling element, and has a coupling face directed towards the measuring tube,
• characterized in that the adjusting device is configured to modify at least one angle of a signal path with respect to the coupling face and/or a signal path length, wherein the adjusting device has at least two degrees of freedom,
• wherein the adjusting device is acoustically and mechanically coupled to the coupling element and the transducer element or measuring tube;
• wherein the adjusting device has a deformable element and a deformation device,
• wherein the shape of the deformable element is directly or indirectly adjustable by the deformation device,
• wherein the deformation device is a screw device or an actuator device.