| 摘要 |
This sensing element, which is to be installed in a pipeline conducting the fluid to be measured, consists of a straight section of pipe (1) with an unrestricted cross-sectional area and an uninterrupted wall to the external surface of which are positively fixed, successively in the downstream direction and in a spaced-apart relationship: a first resonance absorber (11) at the inlet end consisting of at least one absorber disk (111), a first transducer disk (21) having a first ultrasonic transducer (31) attached to one lateral surface thereof which excites the radial resonance frequency of said first transducer disk (21), a second transducer disk (22) having a second ultrasonic transducer (32) attached to one lateral surface thereof which excites the radial resonance frequency of said second transducer disk (22), and a second resonance absorber (12) at the outlet end consisting of at least one absorber disk (121), the absorber disks (111, 121) being dimensioned so that their respective radial resonance frequencies are equal to the excitation frequencies of the associated ultrasonic transducers.
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