スイッチトキャパシタ同期整流器を用いた簡易基本波型直交フラックスゲート

抄録

  In this paper, we present a new method of building a fundamental orthogonal fluxgate magnetometer by using a simple switched capacitor phase-sensitive detector (PSD), in order to accomplish low power consumption and miniaturization. A PSD is one of the most important components of the fluxgate magnetometer electronics. We made a switched capacitor PSD with an LT1043 IC which has a dual switched-capacitor building block, and built it into the fluxgate magnetometer electronics. We also constructed a sensor head with an amorphous wire. Experimental results show that the power consumption of the proposed method is as low as 75 mW with a power supply of ±3 V, and the resolution of the sensor is 27 pT/√Hz. The proposed method uses only three small-scale ICs, which enable us to miniaturize the flux magnetometers.