Research and Application of Hydrological Signal Acquisition Scheme of AFS Flow Measurement Platform
In order to achieve unmanned remote flow measurement,it is necessary to collect three key signals,namely surface sig-nal,flow rate signal and bottom signal.This paper proposes a key hydrographic signal acquisition scheme,which can collect sur-face signal and flow rate signal by spinner flow meter and STM32 microcontroller,and collect buttom signal by encoder and rota-ry arm weightless switch.The flow rate signal is severely disturbed by jitter because of spinner flow meter.This paper proposes the de-jitter filtering scheme and the filter circuit is proved to be feasible by experiment.According to the different A/D acquisition ref-erence voltage caused by water resistance in different regions,a special APP is written,and the parameters are adjusted by Blue-tooth connection,which improves the applicability of the acquisition scheme.After field testing,the flow rate and depth data ob-tained by using this scheme meet the accuracy requirements of hydrological stations,which can effectively save human and time costs and improve the degree of automation of hydrographic flow measurement process.
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