| 摘要 |
A pair of transducers each having metal housings are clamped at spaced axial locations along a conduit and transmit ultrasonic signals to one another through the fluid within the conduit. The difference in upstream and downstream transit times for the ultrasonic energy is used to determine the flow velocity and other characteristics of the fluid within the conduit. Each of the transducer housings has the shape of a trapezohedron, one surface of which converts longitudinal mode sonic energy from a transducer crystal into reflected shear mode sonic energy which is applied at an angle to the pipe surface. The phase velocity of the shear mode sonic energy of the transducer housing matches the shear mode sonic energy in the conduit wall so that there is extremely close coupling between the housing and the conduit and energy is transmitted through the conduit interior over a long axial length of the conduit.
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