Magnetic Field and Displacement sensor based on Giant Magneto-impedance effect

TL;DR

This paper introduces a giant magneto-impedance based transducer using Fe73.5Nb3Cu1Si13.5B9 ribbon for high-sensitivity displacement and current sensing, demonstrating linear and angular displacement detection with significant voltage responses.

Contribution

It presents a novel GMI-based transducer design utilizing a specific ribbon material for precise displacement and current measurement, with detailed sensitivity and linearity analysis.

Findings

Voltage response up to 12 microvolts per micrometer for linear displacement.

Voltage response up to 3 millivolts per degree for angular displacement.

High sensitivity and linearity demonstrated in specific transducer configurations.

Abstract

A two-core transducer assembly using a Fe73.5Nb3Cu1Si13.5B9 ribbon to detect a change of magnetic field is proposed and tested for displacement (linear and angular) and current sensor. Two identical inductors, with the ribbon as core, are a part of two series resonance network, and are in high impedance state when excited by a small a.c field of 1MHz in absence of d.c biasing field (Hdc). When the magnetic state of one inductor is altered by biasing field, produced by a bar magnet or current carrying coil, an ac signal proportional to Hdc is generated by transducer. The results for the sensitivity and linearity with displacement (linear and angular) of a magnet and with field from the current carrying coil are presented for two particular configurations of the transducer. High sensitivities of voltage response as much as 12micro-volt/micro-meter and 3mV/degree have been obtained for the transducer as a linear and angular displacement sensor respectively in the transverse configuration of exciting a.c and biasing d.c fields.