Patent ID: 8794080

Claim:
An ultrasonic flow sensor for detecting a flow of a fluid medium in a flow tube, comprising: at least one first ultrasonic transducer and at least one second ultrasonic transducer; and at least one waveguide configured to (i) conduct ultrasonic waves between the at least one first ultrasonic transducer and the at least one second ultrasonic transducer by reflection on walls of the waveguide, and (ii) enable the fluid medium to flow through the waveguide; wherein the ultrasonic flow sensor is configured to facilitate the ultrasonic waves to propagate between the first ultrasonic transducer and the second ultrasonic transducer on at least two different ultrasonic paths, the ultrasonic waves being reflected different numbers of times on the at least two different ultrasonic paths, and wherein sound energies of the ultrasonic waves transmitted on the at least two different ultrasonic paths differ from one another by no more than a factor of 100.