| 摘要 |
PCT No. PCT/NL79/00005 Sec. 371 Date Jun. 25, 1980 Sec. 102(e) Date Jun. 25, 1980 PCT Filed Oct. 25, 1979 PCT Pub. No. WO80/00876 PCT Pub. Date May 1, 1980.A device for measuring the flow velocity of fluids including at least one pair of electro-acoustic transducers at the ends of a measurement path, said pair of transducers simultaneously transmitting acoustic pulses and receiving the same at first and second times, a transmission circuit, a receiving circuit, an integration circuit having an integration capacitor, the charge and discharge circuits of which are controlled by the transit times of the acoustic pulses, the starting point of which is sharply defined by a control circuit of both transducers.
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