| 摘要 |
A flowmeter measures fluid speed and flow direction in a plane. The flowmeter includes three transducer stations each of which projects acoustic energy towards the other two upon the simultaneous application of a drive signal. Each transducer station provides an output signal in response to the acoustic energy received from a corresponding other transducer station and the respective output signals, which occur at times depending upon the fluid flow, are utilized to obtain the time difference of travel of acoustic energy between the transducer stations to provide a plurality of difference signals. The difference signals are also applied to three stator windings of a synchro in order to obtain a vector direction, by virtue of the response of the rotor of the synchro. Computing means are additionally provided for computing the magnitude velocity of the fluid flow under measurement. In another embodiment speed and direction of fluid flow is obtained by electromagnetic means including three spaced-apart electrical contact pick-ups.
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