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An autonomous bistable MEMS sensor for noninvasive monitoring of AC electrical currents is proposed in this work. The main idea is presented together with simulations and feasibility study. The sensor is composed of a piezoelectric cantilever beam equipped with two permanent magnets having opposed magnetization (one on its free end and one external and fixed) in order to achieve bistable behaviour...
The aim of this paper is to present preliminary experimental results on the performance of RTD Fluxgate magnetometers in security applications. The presence of a metallic object near the sensor can be detected by measuring the weak perturbation of geomagnetic field distribution produced by the magnetic permeability of the material from which the object is made. Results are presented by the use of...
This paper reports an innovative contactless MEMS-based microresonator actuated by an external time-varying magnetic field. The actuation principle is based on the interaction between the eddy currents and the magnetic field generated by an external inductor driven by a sinusoidal current; the system response is sensed via an inductive pick-up based on a high permeability material (100-mum of diameter)...
This paper discusses about the spatial resolution performance on RTD-fluxgate prototypes having different ferromagnetic core geometry. This is of major importance when the magnetic target signal source is very confined in space and therefore the ability of the sensor to correctly point the target is dictated by its ability to resolve the target position. The readout strategy is based on the use of...
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