Abstract:

This paper first analyzes the structural characteristics of magnetic fluid (MF) sensor and the common-ness of MF capacitance sensor in technology. Next , a formula of capacitance is deduced by dividing the combina-tional capacitance into several simple capacitances with series-parallel connection. Then , a sensor model describing the multi-medium semi-cylinder combinational capacitance is set up. Moreover , the capacitance sensitivity and the capacitance are considered as the multi-objective functions to perform a multi-objective optimization , in which the capacitance function is transferred into a linear function according to its characteristics , thus simplifying the multi-objective optimization so as to form a simple objective optimization. Finally , multiple parameters of the model are optimized via the coordinate altemation method with remarkable effect.

Key words: magnetic fluid sensor, multi medium, semi-cylinder capacitance, modeling, optimization