Field Enhancement Effect in High-Altitude Nuclear Electromagnetic Pulse Electric Field Measurement

In order to solve the problem that the enhancement effect of cylindrical pulsed electric field sensor on the field in nearby space causes the measurement result to be too large, the principle of the midfield enhancement effect of electric field measurement is analyzed first, and the definition of field enhancement factor is given. The approximate formula of field enhancement factor is given by analytic method, and the influence of different parameters on field enhancement factor is analyzed qualitatively. The results show that the negative correlation between the field enhancement factor and the radius of the electric field sensor is positively correlated with the height of the electric field probe. Finally, the field enhancement factor under different parameters is given quantitatively by using the method of all-electromagnetic simulation, and the analytical formula is modified according to the simulation results. The calculated field enhancement factor is in good agreement with the simulation results. Using this formula, the field enhancement factor caused by different parameters of sensor shell can be calculated quickly and accurately, and the measurement precision of electric field sensor can be improved.