| 摘要 |
A precipitation measurement system comprises a precipitation sensor and a control unit. The sensor comprises a top cover and a transducer member. The transducer member comprises a piezoelectric element, which is provided with a peripheral edge and a central surface area which is defined inside the peripheral edge. The piezoelectric element is arranged onto an electrically conductive element and connected thereto in an electrically conductive manner. The transducer member is connected to the bottom surface of the top cover such that the piezoelectric element is deformed by the impact of a hydrometeor. A projection of the central surface area, not including the peripheral edge of the piezoelectric element, onto the top surface defines a central zone of the top surface of the top cover. The control unit receives an electric signal which is generated by the piezoelectric element when the piezoelectric element is deformed by the impact of a hydrometeor. The electric signal comprises a first type of waveform when the hydrometeor falls inside the central zone or a second type of waveform when the hydrometeor falls outside the central zone, which second type of waveform is distinct from the first type of waveform. The control unit is configured to analyse and process the electric signal such that the electric signal is identified as a proper measurement when the electric signal comprises the first type of waveform and is identified as an improper measurement when the electric signal comprises the second type of waveform. |
