Resumen de Optimization of a linear displacement sensor using FEM and secondary model

Vultchan Gueorgiev, Zaharinka Gergova, Ivan Yatchev

• Purpose – Differential sensor for linear displacement has been optimized in terms of linearity and sensitivity. The optimization of the sensor is carried out with respect to its characteristic displacement‐output voltage.

  Design/methodology/approach – Response surface methodology and design of experiments have been successfully applied for sensor optimization. First, a full factorial experiment – computation of the quasi‐static electromagnetic field of the sensor using the finite element method – has been performed. Secondary model has been created on the basis of finite element results. Then this model has been optimized with respect to two criteria – linearity and sensitivity.

  Findings – The mutual influence of both criteria has been studied. In this way an optimal trade‐off between linearity and sensitivity of the sensor was achieved.

  Research limitations/implications – Relatively small numbers of optimization criteria have been varied. The results can be further improved by adding additional factors to the study.

  Originality/value – The results obtained improve characteristics of this type of sensor and make it low cost alternative to the high‐end linear displacement sensors in low to moderate accuracy applications.