Ultrasonic fluid meter and method for determining the flow rate and/or volume of a flowing medium

A method for determining at least one of a flow rate or a volume of a flowing medium, the method comprising the following steps:

• using at least one ultrasound transducer to alternately emit and receive ultrasound signals along a first ultrasound measurement path;
• using at least one ultrasound transducer to alternately emit and receive ultrasound signals along a second ultrasound measurement path;
• guiding the ultrasound signals along the first ultrasound measurement path in a flow direction and counter to the flow direction of the medium;
• guiding the ultrasound signals along the second ultrasound measurement path in the flow direction and counter to the flow direction of the medium;
• determining respective times of flight and time-of-flight differences of the ultrasound signals in the first ultrasound measurement path and the second ultrasound measurement path;
• and
• positioning the first ultrasound measurement path and the second ultrasound measurement path to extend at an angle relative to one another and to intersect one another in a common region in a projection plane of a flow cross section of the medium.