Title :
Design of a bias magnetic system of a magnetostrictive sensor for flexural wave measurement
Author :
Kim, Woochul ; Kim, Yoon Young
Author_Institution :
Sch. of Mech. & Aerosp. Eng., Seoul Nat. Univ., South Korea
Abstract :
We report on an investigation of the voltage output from a magnetostrictive sensor for the measurement of elastic flexural waves in a cylindrical steel waveguide. Since the sensor performance is strongly influenced by the bias magnetic field, the bias field optimization is one of the most critical issues in the design of magnetostrictive sensors. For a magnetic system consisting of a yoke and an electromagnet, we formulate a method for optimizing yoke topology in order to maximize the sensor output. Both linear and nonlinear magnetization relations are considered in our analysis. For the verification of the performance of the proposed sensors, we conducted several experiments involving flexural waves to assess the performance of the optimized sensors, and we analyze their results here.
Keywords :
elastic waves; electromagnetic fields; electromagnets; gradient methods; magnetic relaxation; magnetic sensors; magnetostrictive devices; mechanical variables measurement; spatial variables measurement; waveguides; bias field optimization; bias magnetic field; bias magnetic system design; cylindrical steel waveguide; elastic flexural waves; electromagnet; flexural wave measurement; linear magnetization relation; magnetostrictive sensor design; nonlinear magnetization relation; sensor output maximization; sensor performance; voltage output; yoke topology optimization; Design optimization; Electromagnetic measurements; Magnetic analysis; Magnetic field measurement; Magnetic sensors; Magnetoelasticity; Magnetostriction; Sensor systems; Steel; Voltage; Bias magnetic field; electromagnet; flexural wave; magnetostrictive sensor; topology optimization; yoke;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.831629
