| 摘要 |
<p>A fluid flow meter comprises a pair of transducers (8, 9) spaced apart in the direction of fluid flow. A signal generator (20) causes acoustic signals to be transmitted in both directions through the fluid by the transducers (8, 9). A digital signal processing unit (22) determines the information relating to the fluid flow by monitoring the time of flight of acoustic signals received by the transducers. The electrical impedance presented to each transducer (8, 9) is substantially the same when the transducer is transmitting or receiving.</p> |
