Ultrasonic measuring device

An ultrasonic measuring device for detecting a measurand of a medium, the measuring device comprising:

• a measurement chamber, which includes a chamber wall defining a volume and has a chamber longitudinal axis;
• at least one pair of ultrasonic transducers disposed on a first chamber side of the measurement chamber, wherein ultrasonic transducers of a pair of the at least one pair of ultrasonic transducers are configured to transmit ultrasound signals along an ultrasonic signal path between the ultrasonic transducers of the pair through the volume of the measurement chamber and to receive ultrasound signals, wherein the ultrasound signals have a central frequency,
• wherein the ultrasonic signal path includes at least one ultrasound signal reflection on at least one reflection surface, wherein a reflection surface of the at least one reflection surface is disposed on an inner chamber surface of the chamber wall opposite the first chamber side;
• and
• an electronic circuit configured to operate the at least one pair of ultrasonic transducers, to evaluate measurement signals generated by the at least one pair of ultrasonic transducers and to determine measurands of measurement errors,
• wherein the chamber wall in a region of the reflection surface opposite the first chamber side is configured to prevent a reflection of an ultrasonic signal of a chamber outer surface of the chamber wall in a direction of the ultrasonic signal path,
• wherein the chamber wall has, in the region of the reflection surface, a maximum wall thickness that is at least a first factor of 1.5 greater than a Rayleigh wavelength, associated with the central frequency, of the ultrasound signal in the chamber wall.