| 摘要 |
A flow meter for determining a flow rate of a flow of fluid 16 flowing within a channel or pipe 14, comprises: a moveable member, e.g. a turbine 2, for immersion in the flow of fluid 16; a driving means consisting of a power supply 6 and a motor 12 for driving movement of the moveable member 2; and a control system 4 for varying the power supplied to the moveable member 2 by the driving means 6, 12 in response to signals received from pressure sensors 8A, 8B. The flow meter is configured to determine the flow rate by monitoring the operation of at least one of the moveable member 2 and driving means 6, 12. The control system 4 may vary the power until a disturbance caused to the flow by the meter is substantially minimized, with the flow meter using the characteristics of that state to determine a flow rate. |
