Simple and fast liquid inspection method using step response in electromagnetic sensor

The simple and fast liquid inspection method using step response in electromagnetic sensor is presented. When the liquid sample is set inside the cylindrical electromagnetic sensor, the impedance profile of the sensor changes in accordance with the electromagnetic properties of the liquid. First of all, the theoretical background is explained with a simple RLC circuit analysis. To provide a simple and fast measurement, this paper focuses on both the maximum value of the voltage and the time constant. An experimental demonstration of liquid inspection is also presented.