Title :
The Development of a Multi-frequency Electromagnetic Instrument for Monitoring the Phase Transformation of Hot Strip Steel
Author :
Dickinson, S.J. ; Binns, R. ; Yin, W. ; Davis, C. ; Peyton, A.J.
Author_Institution :
Dept. of Eng., Lancaster Univ.
Abstract :
This paper describes the development of an instrument to analyze the phase transformations of hot strip steel using an electromagnetic sensor. The sensor exploits variations in the electrical conductivity and magnetic permeability of the steel to monitor microstructure evolution during processing. The sensor is an inductive device based on a H-shaped ferrite core, which is interrogated with a multi-frequency impedance analyzer (MFIA) containing a digital signal processor (DSP). An overview of the instrument and measurements from a range of carbon steels sample are presented. The results verify the ability of the instrument both to monitor the microstructural changes and to reject variations in liftoff distance between the sensor and the hot strip
Keywords :
condition monitoring; electric sensing devices; electrical conductivity measurement; electromagnetic devices; ferrite devices; magnetic permeability measurement; phase transformations; steel; DSP; H-shaped ferrite core; carbon steels; digital signal processor; electrical conductivity; electromagnetic sensor; hot strip steel; inductive device; magnetic permeability; microstructural changes; microstructure evolution; multifrequency electromagnetic instrument; multifrequency impedance analyzer; phase transformation monitoring; Conductivity; Electromagnetic analysis; Instruments; Magnetic analysis; Magnetic sensors; Monitoring; Permeability; Sensor phenomena and characterization; Steel; Strips;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2005. IMTC 2005. Proceedings of the IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-8879-8
DOI :
10.1109/IMTC.2005.1604311
