Wireless Electric Field Sensor With Adaptive Voltage Gain for Measuring an Electrical Potential Treatment Chair

A wireless electric field sensor for measuring an electrical potential treatment chair is proposed. Research on the treatment effects of the electric field generated by high-voltage (HV) electrodes at low frequencies, in this case, 50 or 60 Hz, has been conducted. However, most studies have only provided the value of the voltage applied to the HV electrodes, not the electric field generated by those. Therefore, it is necessary to provide the value of the electric field to verify the treatment effects. Because the electric field by the chair is too high to be measured by conventional sensors, it is necessary to develop a sensor that can adaptively measure the low and high electric field. The proposed sensor has an adaptive voltage gain that relies on digital potentiometers, which exert control for the proper gain depending on the field strength. Using a capacitive dipole probe, the electric field generated by the HV electrodes applied the voltage of 7.2 kV at 60 Hz was measured at diverse distances. It was found that the electric field was measured from 1.3 to 45.5 kV/m. For wireless notification, the sensor is equipped with a Wi-Fi module in a microcontroller unit.