Patent ID: 7318355

Claim:
An ultrasonic flow velocity meter comprising: a sending transducer mounted obliquely with respect to a longitudinal axis of a conduit line in which a fluid to be measured flows, the sending transducer emitting an ultrasound wave into an interior of the fluid through the conduit line; a receiving transducer for receiving a reflected ultrasonic wave emitted from the interior of the fluid through the conduit line, the reflected ultrasonic wave having been subjected to Doppler shift; and a calculating unit for calculating a fluid velocity of the fluid from an amount of the Doppler shift of the reflected ultrasonic wave received by the receiving transducer; wherein the sending transducer and the receiving transducer are arranged so that an axis of sending of the sending transducer coincides with an axis of reception of the receiving transducer; wherein the sending transducer and the receiving transducer are arranged one on top of the other, a leakage signal of the ultrasonic wave received from the sending transducer and the reflected ultrasonic wave reflected in the interior of the fluid and subjected to the Doppler shift are superimposed in an interior of the receiving transducer, and a signal containing torsional components is directly received by the receiving transducer.