| Title |
Design and Fabrication of a Field Mill for Ground-Level Electric Field Measurement |
| Authors |
Gyung-Suk KilGyung-Suk Kil ; Jae-Yong Song ; Il-Kwon Ki ; Jang-Woo Kwon ; Chang-Hwan Ahn ; Young-Keun Lee |
| Keywords |
Field Mill ; Electric Fields ; Lightning Warning System ; Planar-Shutter Type ; Thunderclouds |
| Abstract |
A field mill capable of measuring the magnitude and polarity of electric fields at the ground level was studied to apply to a lightning warning system as a sensor. We designed and fabricated a planar-shutter type field mill with a rotating-vanes. A calibration of the field mill was performed in a vertically symmetrical arrangement which consists of two equal size parallel round plates to form a homogeneous electrical fields. The sensitivity of the field mill was adjusted at 0.5[V/㎸/m], and this covers a ranges from 200[V/m] to 20[㎸/m]. After the calibration experiment, the field mill was installed on the roof of a building to measure the changes of electric field intensity caused by thunderclouds. During the period from July 1. 2006 to July 15. 2006, the electric field intensity was recorded a ranges of +2[㎸/m]～-6[㎸/m] depending on generation, extinction and movement of thunderclouds. From the actual test on the ground, it is confirmed that the field mill has a good performance necessary for the measurement of DC electric fields. |