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Measuring resistivity in a contactless fashion

Klintrup, Jim LU (2020) FYSK02 20201
Synchrotron Radiation Research
Department of Physics
Abstract
The aim of this thesis work was to develop a rig to measure the resistivity of a metal sample. The initial testing of the rig would be done at room temperature and calibration of the setup would be done with aluminum samples and then metallic alloys would be studied.
The method implemented is a contactless one where the diffusion of eddy currents in a sample is measured by a coil and the resistivity can be deduced. The eddy currents are induced by a pulsed magnetic field and the diffusion of the currents in the sample is due to the resistance of the sample material. This method is the same as that described by C.P. Bean in 1959.
To facilitate the construction of the coils, a coil winding rig was designed and built. In conjunction with... (More)
The aim of this thesis work was to develop a rig to measure the resistivity of a metal sample. The initial testing of the rig would be done at room temperature and calibration of the setup would be done with aluminum samples and then metallic alloys would be studied.
The method implemented is a contactless one where the diffusion of eddy currents in a sample is measured by a coil and the resistivity can be deduced. The eddy currents are induced by a pulsed magnetic field and the diffusion of the currents in the sample is due to the resistance of the sample material. This method is the same as that described by C.P. Bean in 1959.
To facilitate the construction of the coils, a coil winding rig was designed and built. In conjunction with this, calculations were made to approximate the resonant circuitry to simplify tuning of that circuitry at a later stage.
Once the preliminary measuring rig was set up, extensive testing, configuration and calibration of the rig was conducted. This was done with and without a test sample of aluminum rod present inside the rig. The goal of this was to eliminate unwanted interference between different components involved in the experiment and to resolve the measurement of the diffusing eddy currents.
In this thesis, limiting factors of the functionality of the experiment setup are explored. The induction of eddy currents in the sample is strongly dependent on the amount of magnetic flux and its rapid change. The change in magnetic field density, going from maximum to zero, took place over the course of microseconds, which was fast enough but the maximum field strength seen was to small to induce sufficient eddy currents for reliable measurements. (Less)
Popular Abstract (Swedish)
Syftet med detta kandidat arbete var att utveckla ett instrument for att mäta resistansen av olika metaller utan tråd kopplingar mellan metall provet och voltmetern. Detta kan uppnås med magnetfält och en metod som kallas Bean, uppkallad efter C.P. Bean som,
med hjälp av samarbetare, först utveckla metoden 1959. Arbetet börja med att konstrurera en rigg till framställningen av spolarna, följt av framtagningen av spolarna och kretstarna som skulle kopplas till vardera spole. Mätningsinstrumentet testades och kalibrerades med en kort bit aluminium rundstång som uppdagade problem med instument uppsättningen. Slutsatsen från all testning var att där inte var tillräckligt med ström försett till spolen som genererar magnetfältet som orsakar... (More)
Syftet med detta kandidat arbete var att utveckla ett instrument for att mäta resistansen av olika metaller utan tråd kopplingar mellan metall provet och voltmetern. Detta kan uppnås med magnetfält och en metod som kallas Bean, uppkallad efter C.P. Bean som,
med hjälp av samarbetare, först utveckla metoden 1959. Arbetet börja med att konstrurera en rigg till framställningen av spolarna, följt av framtagningen av spolarna och kretstarna som skulle kopplas till vardera spole. Mätningsinstrumentet testades och kalibrerades med en kort bit aluminium rundstång som uppdagade problem med instument uppsättningen. Slutsatsen från all testning var att där inte var tillräckligt med ström försett till spolen som genererar magnetfältet som orsakar strömmen i aluminumen som är grunden till mätningarna. (Less)
Please use this url to cite or link to this publication:
author
Klintrup, Jim LU
supervisor
organization
alternative title
Mätning av resitivitet med en kontaktlös metod
course
FYSK02 20201
year
type
M2 - Bachelor Degree
subject
keywords
resistivity, magnetic, field, diffusive, eddy, current, coils
language
English
id
9028586
date added to LUP
2020-09-15 09:13:29
date last changed
2020-09-15 09:13:29
@misc{9028586,
  abstract     = {{The aim of this thesis work was to develop a rig to measure the resistivity of a metal sample. The initial testing of the rig would be done at room temperature and calibration of the setup would be done with aluminum samples and then metallic alloys would be studied.
The method implemented is a contactless one where the diffusion of eddy currents in a sample is measured by a coil and the resistivity can be deduced. The eddy currents are induced by a pulsed magnetic field and the diffusion of the currents in the sample is due to the resistance of the sample material. This method is the same as that described by C.P. Bean in 1959.
To facilitate the construction of the coils, a coil winding rig was designed and built. In conjunction with this, calculations were made to approximate the resonant circuitry to simplify tuning of that circuitry at a later stage.
Once the preliminary measuring rig was set up, extensive testing, configuration and calibration of the rig was conducted. This was done with and without a test sample of aluminum rod present inside the rig. The goal of this was to eliminate unwanted interference between different components involved in the experiment and to resolve the measurement of the diffusing eddy currents.
In this thesis, limiting factors of the functionality of the experiment setup are explored. The induction of eddy currents in the sample is strongly dependent on the amount of magnetic flux and its rapid change. The change in magnetic field density, going from maximum to zero, took place over the course of microseconds, which was fast enough but the maximum field strength seen was to small to induce sufficient eddy currents for reliable measurements.}},
  author       = {{Klintrup, Jim}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Measuring resistivity in a contactless fashion}},
  year         = {{2020}},
}