Development of an electromagnetic sensing system for field reconstruction and geometrical feature measurement

Magnetic sensing;Eddy current testing;Indoor navigation;Conductivity estimation;Defect detection

Li, Min ; Li, Kok-Meng Mechanical Engineering Melkote, Shreyes N. Prilutsky, Boris Wang, Yan Wang, Yang ; Li, Kok-Meng

University:Georgia Institute of Technology

Department:Mechanical Engineering

关键词: Magnetic sensing;    Eddy current testing;    Indoor navigation;    Conductivity estimation;    Defect detection;   

Others  :  https://smartech.gatech.edu/bitstream/1853/60696/1/LI-DISSERTATION-2017.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

This dissertation has been motivated by two practical applications: The first responds to a need to develop a geomagnetic field-based sensing system to help visually impaired patients locate objects and guide way-finding. The second is a method for intelligent manufacturing application, where an eddy current is electromagnetically induced in a conductive workpiece for real-time measurements of geometrical features. This thesis addresses a common problem in these applications, which involves reconstruction of a physical field from limited measurements for characterizing geometrical features. Inspired by the simplicity of electromagnetic source-based models, this thesis has formulated the forward and inverse electromagnetic problems and derived computationally efficient closed-form solutions to provide a basis for developing a multi-function electromagnetic sensing system and reconstructing a physical field of interest. The source-based models have been employed in the design, analysis and optimization of the sensing system for the above-mentioned applications, upon which two prototype sensing systems have been developed for reconstruction of far and near physical field. An experimental investigation has been carried out to validate the concept feasibility of field reconstruction, verify the source-based models and evaluate the sensor performance. Apart from the development of a multi-function electromagnetic sensing system for geometrical feature measurements, the findings of this thesis have offered a basis of a general field-reconstruction method that has a spectrum of engineering applications.