| 摘要 |
<p>An improvement in systems for measuring the rate of fluid flow wherein the time delay between acoustic pulses transmitted upstream and downstream in a fluid passing along a path of travel is multiplied by repeated transmissions over predetermined time intervals. Successive time intervals over which the transmissions occur vary in duration to compensate for the last-pulse effect wherein the last pulse in the output waveform representing the last two transmitted pulses in the fluid stream is not completely encompassed within a fixed measurement time interval.</p> |
