| 摘要 |
<p>The present invention provides an apparatus (10, 50) for measuring a flow characteristic of a fluid (17, 57) flowing through a conduit. The apparatus (10, 50) comprises a generally cylindrical tube (16, 56) forming a portion of said conduit. The apparatus (10, 50) further comprises a pair of transducers (12, 14, 52, 54) clamped on exteriorly to said tube (16, 56) and located in relative upstream-downstream positions. The pair of transducers (12, 14, 52, 54) comprise means for transmitting ultrasonic energy for propagation therebetween, and said pair of transducers (12, 14, 52, 54) used for measuring said flow characteristic in dependance on the propagation time. The generally cylindrical tube (16, 56) further comprises a pair of surfaces (22, 24, 62, 64) for clamping on said pair of transducers (12, 14, 52, 54) thereto. These surfaces (22, 24, 62, 64) are configured such that the normals (26, 28, 66, 68) to these surfaces (22, 24, 62, 64) are parallel to each other, whereby said pair of transducers (12, 14, 52, 54), when clamped on to said pair of surfaces (22, 24, 62, 64), define a chordal measurement path (20, 60) therebetween through said fluid (17, 57).</p> |
