Patent ID: 7658114

Claim:
An ultrasonic flow meter for measuring a flow rate of a medium flowing through a conduit in a flow direction, said ultrasonic flow meter comprising: a first ultrasonic emitter and a second ultrasonic emitter mounted to said conduit; a first ultrasonic receiver mounted to said conduit and configured to receive a first ultrasonic signal emitted by said first ultrasonic emitter, wherein said first ultrasonic signal travels downstream or substantially perpendicular to said flow direction along a first transmission path length and forms a first angle between said first transmission path and said flow direction; a second ultrasonic receiver mounted to said conduit and configured to receive a second ultrasonic signal emitted by said second ultrasonic emitter, wherein said second ultrasonic signal travels downstream with respect to said flow direction along a second transmission path length and forms a second angle between said second transmission path and said flow direction, and wherein said first angle and said second angle are different; and wherein said flow rate is determined based on a first time interval of said first ultrasonic signal traveling from said first ultrasonic emitter to said first ultrasonic receiver, and a second time interval of said second ultrasonic signal traveling from said second ultrasonic emitter to said second ultrasonic receiver.