Valve-like behaviour of the stress magneto-impedance with applications to stress-sensing media

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Abstract
The proposed stress-sensing media make use of microwave stress magneto-impedance. This effect in Co-rich amorphous wires has been investigated over the MHz frequency range and demonstrated very high stress sensitivity. It was then proposed to utilise this effect in the development of stress sensors. The sensor operation is based on a GMI wire incorporated into a self-oscillating circuit where the voltage measured across the wire is related to the applied tensile stress or torsion. For remote stress sensing, the measuring technique is quite different and is based on the detection of the reflected radiation, which is a function of the stress magneto-impedance.