Self-Powered Electric Field Sensor Based On Droplet Electricity Generator

Droplet-based electricity generator (DEG) have promising applications in raindrop energy harvesting. However, most studies focus on the power performance of DEG, and few investigate their sensing capabilities. For example, rainfall negatively affects high-voltage transmission lines, and real-time monitoring of electric field strength is beneficial for rapid diagnosis. A novel droplet-based electric field sensor (DEFS) is proposed, which enables monitoring in the range of 0 to $200 \mathrm{kV} / \mathrm{m}$ through the effect of the electric field on the electric double layer (EDL) at the liquid-metal interface. We investigate the effect of high voltage electric fields on its output signal strength, verify that the DEFS has good sensitivity to high voltage electric fields, and explain the principle that the electric field strength affects the sensor output. Finally, the single period waveform of the output voltage under different electric field intensity is compared, and the field monitoring ability and self-power supply ability of DEFS are reflected by the number of LED lights lit.