Bachelor's Thesis
Measurement of weak magnetic field in 3D space
Final Thesis 12.29 MB Appendix 1.63 MBAuthor of thesis: Ing. Martin Bár
Acad. year: 2019/2020
Supervisor: Ing. Zdeněk Havránek, Ph.D.
Reviewer: Ing. Stanislav Klusáček, Ph.D.
Abstract:The aim of this thesis is to theoretically examine the magnetic field of miniature cylindrical NdFeB magnets, compare the simulation results to real-world measurements, and design a magnetic field probe using suitable sensors. A FEM simulation was conducted using Ansys AIM and FEMM 4.2. The simulation shows that the magnetic induction on the surface of the magnet depends on the diameter/height ratio. The simulation results also show that 21 µm thick protective layer of Ni-Cu-Ni metal on the surface of NdFeB magnets lowers flux density of the smallest magnet sample (1x1 mm) by up to 14 %. It was also concluded that a larger magnet edge radius results in a higher flux density on the surface of the magnet. The biggest differences between simulation data and data measured by the F.W. BELL gaussmeter occurred in the smallest magnet sample. Using the FEMM 4.2 simulation software, a three-axis magnetic field probe was designed. Potential problems with this probe design have been identified. A simple procedure for probe calibration was proposed.
Magnetic field, NdFeB magnets, sensors, measurement, Ansys, FEMM 4.2, magnetic probe
Date of defence
25.06.2020
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Student při obhajobě uvedl komisi do problematiky měření slabého MP a používaných snímačů. Dále byla popsána poměrně podrobná simulace použitých magnetů v programu ANSYS a návrh měřicí sondy. Otázky oponenta nebyly zpracovány v prezentaci, student na ně ale samostatně odpověděl. Komise měla dále dotazy k provedeným měřením a vlastnostem použitého snímače, které byly také bez problémů zodpovězeny.
Language of thesis
Czech
Faculty
Department
Study programme
Automation and Measurement (BPC-AMT)
Composition of Committee
prof. Ing. Luděk Žalud, Ph.D. (předseda)
Ing. Tomáš Macho, Ph.D. (místopředseda)
Ing. Jakub Dokoupil, Ph.D. (člen)
Ing. Jiří Fialka, Ph.D. (člen)
Ing. Aleš Jelínek, Ph.D. (člen)
Ing. Zdeněk Havránek, Ph.D. (člen)
Supervisor’s report
Ing. Zdeněk Havránek, Ph.D.
Grade proposed by supervisor: A
Reviewer’s report
Ing. Stanislav Klusáček, Ph.D.
Grade proposed by reviewer: A