直流离子流场发生装置优化设计

直流离子流场发生装置对电场传感器在离子流场环境下的测试标定具有重要作用，传统直流离子流场发生装置体积较大难于满足新型电场传感器研制和便携式现场应用，对此该文研究了一种缩小尺寸直流离子流场发生装置。基于理论计算和有限元仿真对装置尺寸、结构等关键参数进行了优化设计。采用在平行板边缘处等分电位的方法减少了边缘效应影响，有效增大了平行板间均匀电场区域，减小了均匀性误差。实验结果表明，在电晕丝电压7 kV时离子流场内不同位置离子流电流强度的相对平均偏差仅为1.66%，说明缩小尺寸的直流离子流场发生装置能够提供均匀的离子流场环境。

Optimal Design of Direct Current Ionized Field Generator

Direct current (DC) ionized field generator plays an important role in the test and calibration of electric field sensors under the condition of ionized field. Traditional DC ionized field generator is difficult to meet the development needs of novel electric field sensors and inconvenient to apply in outdoor fields for its large volume. This paper presents a reduced-scale DC ionized field generator. Based on theoretical calculations and finite element simulation, the critical parameters of device size and structure are analyzed and optimized. The structure is optimized and the fringing field effect is eliminated by equaling potential at the edge of the parallel plate. So the uniform electric field region between the parallel plates is increased and the uniformity error of electric field is reduced. The experimental results show that the relative average deviation of the ion current intensity at different places of the ionized field is only 1.66% when the voltage of corona wires is 7 kV. The reduced-scale DC ionized field generator presented in this paper can generate the uniform ionized field.