Sensitive Magnetic Field Sensor Based on Compensated Double Pick Up Coil

Abstract

Sensitive magnetic field sensor based on compensated double pick up coil has been developed. In order to confirm sensitivity of modified design, experiment carried out in two steps. Firstly, sensitivity of conventional design is clarified. Here pick up coil as an active sensor and solenoid as an excitation coil is separately made. Secondly, modified sensor of integrated configuration is developed. Here for both active flux gate sensor and the excitation coil is made in same one core magnetic. Ferrite and standard foil soft magnetic is utilized in this experiment. In attention, frequency of 50 Hertz is used for the whole experiments. A result showed that sensitivity of the integrated configuration sensor is much larger than conventional one. Then, power consume of the integrated flux gate sensor is much lower than conventional. Finally, a range measurement of the integrated configuration sensor can be realized less than 20 microtesla which potentially may sense a change of natural local magnetic field.