| 摘要 |
In determining the flow velocity or the flow of a streaming fluid, sequences of sound signals are emitted between two sound emitters/sound detectors (5, 6) to propagate in the fluid. Reception of the respective sound signals is detected. The sing-around process is used, the total time of the propagation of the sound signals between the sound emitters/sound detectors being determined and therefrom calculating a measure of the velocity. The start of each emitted sound signal can be delayed with a suitable time period, which is chosen to reduce the effect of sound signals reflected against the sound emitters/sound detectors on direct sound signals received by the other of the sound emitters/sound detectors or at least to reduce the effect of detection errors on the determined flow velocity or on the determined flow. |
