针对传统大气电场仪的信号处理电路结构复杂、数字化程度低等缺点,提出了一种基于FPGA的数字式大气电场仪的设计方案,其前级感应探头采用差分式的测量结构,有效地减少了前级感应片之间的共模干扰,提高了测量精度;以FPGA为核心的数字信号处理电路完成了电场幅值的精确测量和电场信号极性的判断,简化了电路结构.详细给出了该传感器的工作原理以及实现方法,并制作了实验原理样机.实验测试结果表明,该传感器的性能良好,具有重要的应用价值和意义.%In order to overcome the shortcomings of the traditional atmospheric electric field mill such as signal circuit complexity and low digitization,a design scheme of digital field mill based on FPGA is proposed,whose front probe uses a differential mode measuring structure to reduce the common mode interference effiectively and improve the measurement accuracy.Digital signal processing circuit based on FPGA is used in the design to detect the strength and polarity of electric field.A working principle and the realization method of the sensor are given in detail,and experimental prototype is produced.Experimental results prove the excellent performance of the new sensor,which has important application value and significance as well.
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