Observation of the magnetic field using a smartphone

Ogawara, Yasuo; Bhari, Shovit; Mahrley, Steve

doi:10.1119/1.4976667

Cited by 14 publications

(4 citation statements)

References 1 publication

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“…Modern methods of magnetic field visualization include Hall's probe in Teslameter (also Gaussmeter) [16] or using magnetic field sensors in smartphones/tablets [17,18] with proper software application (Phyphox, Physics Sensors Toolbox Suite, etc) and variety of plastic sheet detectors [7,11].…”

Section: Magnetic Field (Line) Visualizationmentioning

confidence: 99%

Investigating magnetization of permanent magnets by magnetic flux viewing film

Erhart,

Hejsková

2024

Phys. Educ.

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Permanent magnets are used in many current industrial as well as home appliances today. Frequently, kitchen plastic magnets could be found at the refrigerators at home. However, the magnetic domain structure of such permanent plastic foils is not known and understood to the users at all. The purpose of this paper is to explain the magnetic domain structure of plastic magnets with Halbach array and ferrite or neodymium magnet polarization orientation. Principles of magnetic field visualization foils (magnetic flux detector and colour changing viewing film) is explained and demonstrated on multipole magnetic structures. Experiments with magnetic polarization reversal by the strong neodymium magnet in weaker ferrite magnetic material is demonstrated. All presented principles are collected in the simple magnetic set and suggested for education of school children of different ages. Elementary school children below 10 years age are mostly interested only in making hidden pictures in magnetic paper and ferrite magnet. Older school children of 11–12 years are able to absorb more knowledge about behaviour and properties of magnets.

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Section: Magnetic Field (Line) Visualizationmentioning

confidence: 99%

Investigating magnetization of permanent magnets by magnetic flux viewing film

Erhart,

Hejsková

2024

Phys. Educ.

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“…This magnet can be moved across the smartphone or tablet while measuring the total field, B T , and the position of the strongest signal indicates the location of the magnetic field sensor. This procedure was already detailed in reference [18]. Three examples for the locations of the magnetic field sensor are given in figures 1(a)-(c).…”

Section: Experimental Meansmentioning

confidence: 99%

Measurement of the characteristics of the Earth’s magnetic field using a smartphone magnetic sensor

Koblischka¹,

Koblischka-Veneva²

2022

Phys. Educ.

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Several properties of Earth’s magnetic field (field vectors, time dependence) are measured in various locations using a smartphone/tablet magnetic sensor. To enable a proper use of the magnetic sensor as a classroom tool, the exact location of the sensor in the device and its resolution must be identified in a first step. Then, students may perform several measurements on their own, allowing a comparison of the recorded field vectors and a discussion of the possible deviations. We also show that long-time measurements of the local magnetic field are possible using the smartphone sensors, which can be compared to available internet data. All the information obtained enables a better understanding of the properties of the Earth’s magnetic field and of the requirements for real applications of magnetic sensor elements.

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“…7 The sensor has been used to explore the magnetic field generated by the Earth in both a laboratory context 8 and in semester-long examinations of the local magnetic field. 9 The magnetic field sensor has also been a) Electronic mail: mcsullivan@ithaca.edu used to measure the magnetic fields from wires, 10 from electric rails, 11 from Helmholtz coils (when paired with the accelerometer), 12 and recently in measurements of a dipole and linear quadrupole. 13 Our work builds on Ref.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Magnetic Field outside small Accelerator Magnet Analogs via Experiment, Simulation, and Theory

Sullivan¹,

Sen²,

Sullivan³

2021

Preprint

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Multipole expansions of electric charge and current distributions and the fields those multipoles create are a fundamental pillar of electromagnetic theory, but explanations and examples are rare beyond a dipole. In this paper we describe a low-cost exploration of magnetic multipoles. Using the field from ideal magnetic dipoles and a simple binomial approximation, we show that each multipole obeys B ∝ r n , with n = −3, −4, −5, −6 for a dipole, quadrupole, sextupole, and octupole, respectively. Using commercially available NdFeB magnets and the magnetic field sensor inside a smartphone, we experimentally verify the power-law dependence of the multipole configurations. Finally, the open-source Python library Magpylib can simulate the magnetic field of arbitrary permanent magnet distributions, which also shows the same power law dependence for the different multipole configurations.

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Observation of the magnetic field using a smartphone

Cited by 14 publications

References 1 publication

Investigating magnetization of permanent magnets by magnetic flux viewing film

Investigating magnetization of permanent magnets by magnetic flux viewing film

Measurement of the characteristics of the Earth’s magnetic field using a smartphone magnetic sensor

Investigating the Magnetic Field outside small Accelerator Magnet Analogs via Experiment, Simulation, and Theory

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