球形光纤传输三维电场传感器

Three-dimensional electric-field sensor for spherical fiber transmission

研制了一套用于小空间电磁脉冲测试的光纤传输电磁脉冲三维电场传感器。通过电磁仿真软件CST2011,研究了天线结构对被测场的影响,发现嵌入式探头与球形结构可以有效减小屏蔽壳体对电场扰动。讨论了传感器极间耦合及三维场合成误差,确定了主要设计参数。研制的三维传感器采用了屏蔽结构与偶极子天线的一体化设计,对外部电场屏蔽可达60dB。在有界波电磁脉冲模拟器中的实验表明,传感器系统对于三维电场测量可达到设计要求,对被测电场扰动较小,极间耦合系数小于6%,三维场角度与峰值合成误差小于5%。传感器采用对称结构,满足自由空间场测量的需要。

A small size 3D fiber-optic electric field sensor for measurement of electromagnetic pulse（EMP） in small volumes is developed.The influence of the sensor structure on the tested field is analyzed by CST2011.Meanwhile,the disturbance from shielding enclosure can be effectively reduced by simulating its embedded and spherical structure.The sensor interelectrode coupling and the three-dimensional field error of the synthesized field are discussed.Design parameters are defined based on the analysis results.A conformal sensor structure is utilized to act both as the dipole antenna and the shielding enclosure.The shielding efficiency of the external electric field can reach 60 dB.Experiments in the bounded-wave EMP simulator show the sensor can meet the requirements for three-dimensional electric field measurement and has smaller perturbation to the measured field.The interelectrode coupling coefficient is less than 6% and the error of the synthesized field is less than 5%.The balanced structure of the sensor makes it suitable for EMP measurement in small volumes and in free field.