Abstract
A new high-performance micro-current sensor with circular amorphous wire magneto-impedance (MI) element installed in a Colpitts oscillator is presented. A zeromagnetostrictive amorphous wire ((Fe0.06Co0.94)72.5 Si12.5B15, λs = -10-7) was used to make a circular head with a 10 mm diameter set around a conductor. The current sensor is of the amplitude modulation-demodulation type with a strong negative feedback loop. It has a sensing performance of a high linearity (a non-linearity of less than 0.5%FS (± 1.5 A)), quick response with a cur-off frequency of about 1 MHz due to a high oscillation frequency of 30 MHz, and a high sensitivity of about ±10μA(ƒ=1kHz). This sensor works stably in uniform-distrubance magnetic field such as the terrestrial magnetic field (≅0.3 Oe), because of the cancelling in the circular MI head.
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