Design and development of a low-cost digital display for water flow rate measurements

摘要

A basic requirement in the measurement of flow rate using a target fluidic flowmeter is the use of Fourier Transform to determine the flow oscillation frequencies and from thence the flow rate. In such a flowmeter, the inlet fluid jet impinges upon a rectangular target, thereby setting up flow oscillations about the target. The oscillation frequency is directly proportional to the flow rate. A digital flow-rate display has been designed and developed to convert the signal from a fibre-film probe of a constant temperature anemometer into direct reading of flow rate. This low-cost device is able to perform as good as a commercial dynamic signal analyzer, with the additional feature of a direct read-out of flow rate.