The measuring and converting circuit adopted by the inductance sensor often needs an AC exciting signal

making it inconvenient for use.A measuring and converting method is introduced.The inductance sensor is excited by a sin wave signal obtained by filtering and amplifying a square wave signal

which is produced by a single-chip computer.The output AC signal from the sensor is turned into DC signal by an isolation electric quantity sensor and is measured by the single-chip computer.The measured result is sent out by RS—232 interface.The measuring and converting module based on this method has the properties of simple circuit

high precision and the result is convenient for digital processing.