Patent ID: 7360448

Claim:
A flow sensor comprising: a conduit having a length and a longitudinal axis that extends parallel to the length; a first ultrasonic transducer disposed at a first position along the length of the conduit, the first ultrasonic transducer having a transducer face configured to receive and transmit acoustic energy along a first path segment; a second ultrasonic transducer disposed at a second position along the length of the conduit, the second ultrasonic transducer having a transducer face configured to receive and transmit acoustic energy along a second path segment; a first reflecting interface having a first reflecting surface positioned to reflect acoustic energy from a direction along one of the first path segment and a third path segment to a direction along the other of the first path segment and the third path segment, the third path segment extending from the first reflecting surface to the longitudinal axis; and a second reflecting interface having a second reflecting surface positioned to reflect acoustic energy from a direction along one of the second path segment and a fourth path segment to a direction along the other of the second path segment and the fourth path segment, the fourth path segment extending from the second reflecting surface to the longitudinal axis.