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Pulsed-electromagnet EMAT for high temperature applications
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Hernández Valle, José Francisco (2011) Pulsed-electromagnet EMAT for high temperature applications. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2566262~S1
Abstract
This thesis is concerned with the design and implementation of an Electromagnetic
Acoustic Transducer (EMAT) intended for high temperature ultrasonic applications;
which benefits from a novel approach using a pulsed current electromagnet (PE) and
a ceramic encapsulated spaced spiral coil, both designed to operate at elevated temperatures
without any active cooling.
In detail all the steps taken towards the development of the PE-EMAT and its supporting
electronics are presented here, together with the finite element simulations
performed for the electromagnetic and ultrasonic analysis; which includes: the computation
of the flux density produced by the electromagnet and its variation with
lift-off (gap between core and metallic sample), the calculation and visualisation of
the magnitude of the current density induced by an alternating current flowing in
two different EMAT coil designs in non-magnetic and magnetic samples; as well as
the validation of the propagation of the ultrasonic wave generated/detected by the
PE-EMAT.
The experimental results regarding the performance of the PE-EMAT are also presented.
Firstly, the performance at room temperature to show the shear wave generation
in paramagnatic and ferromagnetic samples, the effect of the presence of an
oxide layer adhered to the sample, and the lift-off performance. Secondly, the performance
at a range of different temperatures to demonstrate that the PE-EMAT
has been employed successfully at temperatures up to 600 oC, without using any
active cooling system, and that is capable of performing ultrasonic measurements of
sample thickness and material properties, without the use of any sort of couplant,
nor the necessity of sample preparation.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics | ||||
Library of Congress Subject Headings (LCSH): | Ultrasonics, Electromagnetism, Materials at high temperatures | ||||
Official Date: | September 2011 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Dixon, Steven Mark, 1969- | ||||
Sponsors: | Consejo Nacional de Ciencia y Tecnología (Mexico) [Mexican Council for Science and Technology] (CONACYT) | ||||
Extent: | xix, 177 leaves : ill., charts | ||||
Language: | eng |
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