Patent ID: 7069793
Filing Date: 2006-07-04
Classification: G01F

Abstract:
1. An ultrasonic flow meter comprising: at least two ultrasonic sensors each for emitting and detecting ultrasonic waves; wherein the ultrasonic sensors are disposed at a predetermined interval in a length direction of a flow path so as to measure a flow rate from a difference in propagation times of the ultrasonic waves between the ultrasonic sensors; wherein the ultrasonic sensors each comprise a semicircular disk shaped transducer having a notch which comes into tight contact with an envelope of the flow path so as to be detachably mounted on the envelope of the flow path; wherein the ultrasonic waves which are emitted from the ultrasonic sensors are propagated in all directions as spherical waves, including directly along the flow path in upstream and downstream directions so as to be directly detected by each other; and wherein a ratio (t/L) of a thickness t of the ultrasonic sensors in the length direction of the flow oath to a length L between the ultrasonic sensors does not exceed a reference value of a detection resolution of the ultrasonic sensors.