Design Of Digital Electric Field Measurement System Base On Vibrating Capacitive Sensor

In order to satisfy the needs of measurement on electric field taken in study on the charged particles, an electric field measurement system using the vibrating capacitive sensor as the probe which can get induced charge from the space electric field was designed based on the dynamic capacitance measurement principle. To realize the measurement taken under some particular atmospheric environments, and improve the disadvantages of common electric filed measurement instruments when using under the dusty environment. A miniature probe was designed in this electric field measurement system, it can get induced charge from the ambient electric field with a vibrating induction sheet metal on top of it. Through using several simply circuits to get a output shows linear relationship with the strength of electric field, and a variety of signal processing methods to improve the response of the signal by setting an analog circuit, a digital circuit, and a single-chip digital smoothing filter operation, this electric field measurement system can be used under extreme atmospheric environments to measure the electric field such as sandstorms, with the features of small cross-section probe, higher-frequency sampling, high accuracy of the sampling data, and high anti-jamming. Further, a three-dimensional measurement probe which can measure the electric field at a point in three three-dimensional direction and a adjustable measurement range is designed, make the measurement system more applied, to realize the function of multi-point sampling, and obtain a wider measurement range, offer a better solution of electric field measurement system in study of large-scale electric field and measurement taken under environments where variety of electric field strengths exist.