09 Dec, 2019

Modeling of an electromagnetic geophone with passive magnetic spring

Research Area: TU/e Year: 2009
Type of Publication: Article
Authors: Oome, AJA; Janssen, JLG; Encica, L.; Lomonova, EA; Dams, JAAt
Journal: Sensors and Actuators, A: Physical Volume: 153
Number: 2 Pages: 142-154
BibTex:
Abstract:
This paper presents an analysis of a novel, patent pending \cite{MI}, 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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Dr. J.L.G. (Jeroen) Janssen MSc

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