A Portable NMR Spectrometer With a Probe Head Combining RF and DC Capabilities to Generate Pulsed-Field Gradients

Wegemann, Andreas; Staat, Christoph; Rapp, Jonathan; Heidsieck, Alexandra; Haase, Axel; Gleich, Bernhard

doi:10.1109/tim.2020.2993981

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…When the current density component J ϕ ′ (ϕ ′ , z ′ ) of the coil and its corresponding Fourier variation F m ϕ ′ (k) have been determined, the magnetic field can be calculated using (5). The current density component J ϕ ′ (ϕ ′ , z ′ ) carried by the saddle coil can then be expressed as…”

Section: Magnetic Field Of the Coils In A Vacuummentioning

confidence: 99%

“…Examples of these devices include spin-exchange relaxation free (SERF) atomic magnetometers [1][2][3], nuclear magnetic resonance gyroscopes (NMRGs) [4], * Author to whom any correspondence should be addressed. magnetic resonance imaging devices [5,6], and atomic clocks [7]. The external stray field can be attenuated to a few nT using a passive magnetically shielded cylinder (MSC) with high permeability, and the triaxial uniform magnetic field coils are then used to generate magnetic fields with equal amplitudes in opposite directions to compensate accurately for the remanence [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Analytical model for calculation of the magnetic field of triaxial uniform coils in magnetically shielded cylinder

Zhao¹,

Wang²,

Zhou³

et al. 2022

J. Phys. D: Appl. Phys.

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An analytical model to calculate the magnetic field of triaxial uniform coils inside magnetically shielded cylinders (MSCs) composed of high-permeability materials is proposed. The proposed model offers two major advantages over existing methods. First, the model is not limited to the research on coaxial circular coils, but also can be used to analyze the magnetic field characteristics of saddle coils inside MSCs. Second, based on Green’s function expansion and the ferromagnetic boundary conditions, the image method is introduced to consider the reflection effect of the MSC end cap on the coil, thus enabling the coupling effect between the coil and the MSC to be analyzed. To verify the model’s correctness, simulations and experiments are performed separately. With regard to the magnetic field distributions of the saddle coil and the Lee-Whiting coil within a range of ± 80 mm along their axes, the results show that the maximum relative error between the analytical method and the finite element method results is 0.08% and 0.06%, respectively; the maximum relative error between the experimental values and the analytical values is 0.29% and 0.13%, respectively, thus confirming the validity of the analytical model. The results of this research have far-reaching implications for the research of quantum precision measurement devices and triaxial uniform field coils.

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Section: Magnetic Field Of the Coils In A Vacuummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical model for calculation of the magnetic field of triaxial uniform coils in magnetically shielded cylinder

Zhao¹,

Wang²,

Zhou³

et al. 2022

J. Phys. D: Appl. Phys.

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show abstract

“…Other portable and miniature spectrometers were developed using existing standard development platforms, such as Terasic DE0-nano, LMS7002M, and Ettus N200 [26]- [29]. A SoCbased approach was also used in some cases, where the FPGA embeds a hybrid system containing programmable logic and a processor subsystem [30]- [32]. Some researchers developed portable FPGA based NQR spectrometers and simulated realtime post-processing denoising algorithms [33], [34], and incorporated denoising algorithms on FPGA embedded processor [35].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Validation of a SoC-FPGA-Based Compact NQR Spectrometer

Kachkachi,

Gansmuller,

Rabah

2024

IEEE Trans. Instrum. Meas.

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Nuclear Quadrupolar Resonance (NQR) is a radio frequency spectroscopy technique providing high resolution molecular analysis of solid materials containing quadrupolar atomic nuclei. The NQR technique does not necessitate an external magnetic field and, therefore, permits a large number of applications; it nevertheless suffers from relatively low sensitivity. The challenges of NQR instrumentation are therefore to increase its portability and sensitivity, and to limit interference from various noise sources (e.g., radio frequency interference) in order to perform field applications outside the laboratory. To address these challenges, we present a System-on-Chip Field-Programmable Gate Array (SoC-FPGA) based portable spectrometer integrating the major hardware elements of NQR instrumentation. These include : a high pulse width resolution pulse programmer, a fully controllable pulse transmitter, an acquisition module that performs detection, digital signal processing and storage of the acquired signal in an external memory, in addition to a hardware debugger. Pulser and acquisition Linux applications are embedded on the SoC-FPGA. While many recent compact spectrometers still have crucial radio frequency (RF) parts in the analog domain and lack performance optimization, most of our hardware and software modules are digitally implemented on SoC-FPGA. The designed portable spectrometer was successfully tested by detecting the expected frequencies of several samples such as N aN O2, HM T or 1, 3, 5 − T CB covering hence the typical 14 N and 35 Cl NQR frequency ranges.

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Design of Gradient Magnetic Field Coil Based on an Improved Particle Swarm Optimization Algorithm for Magnetocardiography Systems

Zhao

Zhou

Xie

et al. 2021

IEEE Trans. Instrum. Meas.

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A Portable NMR Spectrometer With a Probe Head Combining RF and DC Capabilities to Generate Pulsed-Field Gradients

Cited by 9 publications

References 37 publications

Analytical model for calculation of the magnetic field of triaxial uniform coils in magnetically shielded cylinder

Analytical model for calculation of the magnetic field of triaxial uniform coils in magnetically shielded cylinder

Design and Experimental Validation of a SoC-FPGA-Based Compact NQR Spectrometer

Design of Gradient Magnetic Field Coil Based on an Improved Particle Swarm Optimization Algorithm for Magnetocardiography Systems

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