Patent ID: 7942068

Claim:
A multi-path ultrasonic flow meter for determining the flow rate of a fluid in a conduit comprising: said conduit having a mid-radius chord location where the ratio of the path velocity of said fluid averaged along said mid-radius chord to said flow rate is substantially constant over a range of Reynolds numbers; a first transducer pair attached to said conduit forming a first ultrasonic path at a first chord location at a first distance from the center of said conduit, wherein said first distance is greater than the distance of said mid-radius chord to said center; a second transducer pair attached to said conduit forming a second ultrasonic path at a second chord location at a second distance from said center of said conduit, wherein said second distance is less than said distance of said mid-radius chord to said center; flow electronics for determining a first path velocity of said fluid averaged along said first ultrasonic path and a second path velocity of said fluid averaged along said second ultrasonic path, wherein the composite ratio of said first path velocity and said second path velocity to said flow rate is substantially constant over said range of Reynolds numbers.