A comparative study of the magnetic field homogeneity for circular, square and equilateral triangular helmholtz coils

Restrepo, Andrés Fernando Mejía; Franco, Édinson; Cadavid, Héctor; Pinedo, Carlos

doi:10.1109/iceeccot.2017.8284514

Cited by 17 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference of ~5.6% in magnetic field strength between experimental and theoretical values may originate from the sensitivity of the gaussmeter or the amplifying effect of the coil spools/surrounding ferromagnetic materials, which are in agreement with the similar results in the literature [30,31], showing the experimental magnetic field strength measurements can be higher than the simulated magnetic field. Although the difference was 5.6% in the amplitude, the Pearson's correlation of line profiles was above 0.98 with p<0.001 suggesting a statistically reasonable correlation.…”

Section: Discussionsupporting

confidence: 88%

Design and Development of a Helmholtz Pair System for Production of a Low-Magnetic Field of up to 7.5 mT

Gokpek¹,

YURDAKOŞ²,

Doganay³

2021

European Journal of Technic

View full text Add to dashboard Cite

Section: Discussionsupporting

confidence: 88%

Design and Development of a Helmholtz Pair System for Production of a Low-Magnetic Field of up to 7.5 mT

Gokpek¹,

YURDAKOŞ²,

Doganay³

2021

European Journal of Technic

View full text Add to dashboard Cite

“…2 Multiple Helmholtz-like coils are also utilised, where the resulting magnetic field is easily calculated through derivation of the Biot-Savart law. 32,33 Three pairs of orthogonal Helmholtz coils located outside the sensor package are used to apply magnetic test signals. The static fields are driven using a custom low-noise current driver.…”

Section: Methodsmentioning

confidence: 99%

Three-axis magnetic field detection with a compact, high-bandwidth, single beam zero-field atomic magnetometer

Dawson,

O'Dwyer,

Mrozowski

et al. 2024

Quantum Sensing, Imaging, and Precision Metrology II

View full text Add to dashboard Cite

Zero-field optically pumped magnetometers (OPMs) have emerged as an important technology in the realm of biomagnetic research, providing extremely small magnetic field detection capabilities, femtotesla-level, contained in a non-cryogenic compact form factor. Often, compact zero-field OPMs extract single or two-axis magnetic information, typically with a sensing bandwidth of < 100 Hz. The resolution of multiple axes of magnetic field is particularly important for accurate representation of radial components of biomagnetic fields. However, the presence of multi-axis static magnetic fields across the OPM causes measurement errors that degrade signal resolution. 1 Here, we utilise our compact caesium single beam zero-field OPM 2 to address these limitations. We magnetically modulated along both transverse axes of the sensor, at unique frequencies, to extract all axes static-field information. Active feedback can be realised through a lock-in detection scheme at f Mod,x/y for the x-and y-axes, and at 2f Mod,x for the beam axis, z. Operation in this scheme allows for the extraction of three-axis magnetic field information from only a single beam and highlights the importance of active feedback in high-sensitivity biomagnetic applications. The portable sensor also demonstrates a bandwidth with a -3 dB point at ≃ 1600 Hz. The combination of high bandwidth and the capability to extract three-axis magnetic fields opens up exciting prospects for resolving high-frequency biomagnetic signals.

show abstract

“…We are now considering the CH coil depicted in figure 8, here O is the origin of the rectangular coordinates Oxyz. Assume the CH coils are driven by a sinusoidal source, the amplitude of the magnetic flux density B right at the middle of the two coils is [35] m a = =…”

Section: Parametersmentioning

confidence: 99%

“…Configuration of circular Helmholtz coil, where the radius of each coil and the distance between them are denoted by a and h respectively which are the same as in[35] for convenience of following derivations.…”

mentioning

confidence: 99%

Wireless power transfer system with center-clamped magneto-mechano-electric (MME) receiver: model validation and efficiency investigation

Truong¹,

Roundy²

2018

Smart Mater. Struct.

View full text Add to dashboard Cite

This paper presents a complete equivalent circuit model for a wireless power transfer concept utilizing a center-clamped piezoelectric cantilever beam with magnetic tip masses as a receiver. The analytical solution for the power delivered to a load resistance is given as a function of material properties, beam characteristics and external magnetic field strength. The lumped element model is experimentally verified. The efficiency of the system is thoroughly investigated and validated. The essential effect of the coil resistance is highlighted. The analyses show that optimization of transmitter coil size and geometry of the piezoelectric transducer has a significant impact on the transduction factor between the magnetic-mechanical-electrical domains, which greatly improves the transmission efficiency. Finally, the model for evaluating the efficiency is generalized for other similar structures.

show abstract

A comparative study of the magnetic field homogeneity for circular, square and equilateral triangular helmholtz coils

Cited by 17 publications

References 32 publications

Design and Development of a Helmholtz Pair System for Production of a Low-Magnetic Field of up to 7.5 mT

Design and Development of a Helmholtz Pair System for Production of a Low-Magnetic Field of up to 7.5 mT

Three-axis magnetic field detection with a compact, high-bandwidth, single beam zero-field atomic magnetometer

Wireless power transfer system with center-clamped magneto-mechano-electric (MME) receiver: model validation and efficiency investigation

Contact Info

Product

Resources

About