A wireless electric field sensor based on a langasite resonator

Electric field measurement is not only important for the lift-off of guided missiles, rockets or spacecraft, but is also widely used for safety in urban environments (preventing pollution), super clean labs, oil refineries, bunker stations, explosive plants, wallpaper factories, mining, and in forest fire prevention Various electric field sensors have been developed to monitor electric field intensity on the ground or in the air, to implement effective survey and analysis, to provide reliable methods and basis for meteorological support and to avoid the destructive effect of a high electric field. This article presents a wireless field sensor system based on a langasite resonator. By using frequency conversion techniques the system converts the ultrasonic signal of the sensor to a microwave signal, so that it can transmit the signal wirelessly without digitization. The sensor uses passive components which modulate and transmit the full wave form of the ultrasound signal. A high voltage circuit is constructed in order to measure the frequency shifts of the langasite resonator caused by the applied high voltage. A doubly-rotated plano-plano langasite resonator (ΥXlw)θ/Φ 45°/85°operating on its third overtone (6.304844 MHz) was used as the sensor core in the test of wireless transmission system. A network analyzer was used to test wireless system data and compare it with similar wired system data. The comparison shows a good agreement This system has many potential applications and can also be transformed to other types of sensor s.