A PSpice Model for Sensors Based on Stressimpedance Effect

Cristian Fosalau, Ionel Hogas, Cristian Zet, Daniel Petrisor

Abstract

In the paper, a new PSpice model aimed for simulating the stressimpedance effect in magnetic amorphous microwires is presented. The application of the model is made on a highly sensitive strain gage whose characteristic depends both on the applied strain and on the frequency of the current flowing through it. The characteristic to be modelled is a nonlinear surface representing a complex impedance, which has been implemented in PSpice using ABM functions, starting from the experimental characteristics of the sensor. The benefit of our modelling method is that it may be customized to a certain device exhibiting particular features, thus leading to a higher accuracy for a large range of operation. In our example, the surface was approximated by 2-variables polynomials, but, generalizing, any other type of functions may be employed for curve fitting. Another advantage of the method is that it can be extended to other devices nonlinearly working on spaces of more than 2 dimensions.

Keywords

Spice model, strain gage, magnetic amorphous microwires, stressimpedance

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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