| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a flow velocity sensor capable of directly detecting the flow velocity of a fluid in conformity with the flow of the fluid. <P>SOLUTION: The flow velocity sensor includes a vortex generation part 4 which periodically generates a vortex in the fluid flowing in a flow passage 2, and a self-excitation type power generation sheet 6 which vibrates by periodic behavior of vortexes to generate electric power. Vibration period detection means 10 of finding the vibration period of the power generation sheet 6 based upon the frequency of the electric power generated by the power generation sheet 6 is provided while electrically connected to the power generation sheet 6. Further, there is provided flow velocity derivation means 11 of deriving the flow velocity of the fluid based upon the vibration period of the power generation sheet 6 detected by the vibration period detection means 10. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
