Article ID Journal Published Year Pages File Type
736926 Sensors and Actuators A: Physical 2009 13 Pages PDF
Abstract

This paper presents an analysis of a novel, patent pending [Magnetic Innovations, www.MagneticInnovations.com], absolute velocity sensor, or geophone. Conventional geophone topologies are discussed and their intrinsic physical limitations, given by the mechanical construction, are shown. Therefore, a new topology with passive magnetic spring is proposed. A unified semi-analytical solution for the magnetic field equations is derived in cylindrical coordinates and used to determine the static response characteristics of the proposed geophone configuration. Furthermore, a prototype is built and measurements are performed and analyzed to obtain the dynamic behavior. A further improvement of the novel geophone is proposed by means of optimization using finite element analysis.

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Physical Sciences and Engineering Chemistry Electrochemistry
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