Magnetic circuit design of self-powered vibration sensor for structural health monitoring system

Abstract

We have been developing a self-powered vibration sensor for bridge structural health monitoring systems using a magnetostrictive material. In this study, a novel sensor structure was investigated to adjust the bias magnetic field of the magnetostrictive rod to a uniform value that maximizes the voltage generated by passing medium-sized vehicles. The improved sensor was designed so that the magnetic field within the magnetostrictive material was in the range of 3000-4000 A/m.