%0 Journal Article %T Development of a Space-charge-sensing System %A Ariadi Hazmi %A Nobuyuki Takagi %A Daohong Wang %A Teiji Watanabe %J Sensors %D 2007 %I MDPI AG %R 10.3390/s7123058 %X A system for remotely measuring the distribution of air space charge in real time is developed. The system consists of a loudspeaker and an electric field antenna. By propagating a burst of directional sound wave from the speaker, a modulation in the space charge and, therefore, an electric field change at ground is produced. The distribution of the space charge density is derived from the E-field change which can be measured by the E- field antenna. The developed system has been confirmed by both laboratory and field experiments. %K Space charge %K remote sensing %K thundercloud %K lightning. %U http://www.mdpi.com/1424-8220/7/12/3058