Optimization of a linear displacement sensor using FEM and secondary model

Abstract

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.

Citation

Gueorgiev, V., Gergova, Z. and Yatchev, I. (2009), "Optimization of a linear displacement sensor using FEM and secondary model", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 28 No. 5, pp. 1266-1275. https://doi.org/10.1108/03321640910969511