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Vpliv uravnoteženosti Wheatstonovega mostiča na merjenje magnetostrikcije
ID Šraj, Nejc (Author), ID Vrtnik, Stanislav (Mentor) More about this mentor... This link opens in a new window

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Abstract
V zaključni nalogi je bilo obravnavano merjenje magnetostrikcije z uporovnimi lističi v kombinaciji z Wheatstonovim mostičem. Meritve so potekale na sistemu za merjenje fizikalnih lastnosti (Physical Property Measurement System -- PPMS), ki omogoča merjenje v magnetnem polju od $-9\,\mathrm{T}$ do $9\,\mathrm{T}$. Glavni cilj naloge je bil razvoj testnega merilnega instrumenta, ki omogoča hkratno merjenje štirih vzorcev, kar je v primerjavi z merjenjem enega samega vzorca časovno ugodnejše. Metoda je tudi cenovno ugodna, saj so upori in uporovni lističi za izdelavo štirih Wheatstonovih mostičev poceni. Prednost takšnega načina merjenja je tudi v tem, da so upori, vezani v Wheatstonov mostič, izven kriostata, zato so med merjenjem ves čas pri enakih pogojih. V sklopu naloge so bila analizirana tudi odstopanja uporov in uporovnih lističev od nazivnih vrednosti ter njihov vpliv na meritev in rezultate. Na koncu so bile izvedene še testne meritve za aluminij in neorientirano elektropločevino, pri temperaturi $T = 300\,\mathrm{K}$ in v magnetnem polju od $-9\,\mathrm{T}$ do $9\,\mathrm{T}$.

Language:Slovenian
Keywords:magnetostrikcija, Wheatstonov mostič, PPMS
Work type:Final paper
Typology:2.11 - Undergraduate Thesis
Organization:FMF - Faculty of Mathematics and Physics
Year:2026
PID:20.500.12556/RUL-186882 This link opens in a new window
COBISS.SI-ID:290371843 This link opens in a new window
Publication date in RUL:06.09.2026
Views:52
Downloads:18
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Secondary language

Language:English
Title:The influence of Wheatstone bridge balance on magnetostriction measurement
Abstract:
This thesis addresses the measurement of magnetostriction using strain gauges in combination with a Wheatstone bridge. The measurements were carried out on a Physical Property Measurement System (PPMS), which enables measurements in a magnetic field ranging from $-9\,\mathrm{T}$ to $9\,\mathrm{T}$. The main objective of the thesis was to develop a test measurement instrument capable of measuring four samples simultaneously, which is more time-efficient than measuring a single sample. The method is also cost-effective, as the resistors and strain gauges required to build four Wheatstone bridges are inexpensive. A further advantage of this measurement approach is that the resistors connected in the Wheatstone bridge are outside the cryostat, so they remain under constant conditions throughout the measurement. As part of the thesis, the deviations of the resistors and strain gauges from their nominal values were also analysed, along with their effect on the measurement and the results. Finally, test measurements were performed on aluminium and non-oriented electrical steel at a temperature of $T = 300\,\mathrm{K}$ and in a magnetic field ranging from $-9\,\mathrm{T}$ to $9\,\mathrm{T}$.

Keywords:magnetostriction, Wheatstone bridge, PPMS

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