A portable, submersible, MR sensor – The Proteus magnet

Ross, Michael; Wilbur, Grant R.; Cano-Barrita, P. F. de J.; Balcom, Bruce J.

doi:10.1016/j.jmr.2021.106964

Cited by 14 publications

(6 citation statements)

References 26 publications

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“…37,38 Here, the MMP not only serves as the skin-like ridge to deform according to external topology but also provides the magnetized source with defined north/south (N/S) poles via incorporation of NdFeB microparticles. 39,40 After the current signals are converted into the frequency domain by fast Fourier transform (FFT), the characteristic frequency value can represent the eigenfrequency of the MMP, which is applied as the factor to determine the existence of the convex pattern at the corresponding region. For a surface with built-in information, e.g., letters or numbers, the patterns are normally composed of multiple line elements.…”

Section: Resultsmentioning

confidence: 99%

“…During this process, the mechanical deformation and release of the magnetized micropillar would result in the variation of the spatial magnetic flux distribution. With a conductive coil layer below, this dynamic oscillation process can be electrically perceived as induced currents based on the law of electromagnetic induction. , Here, the MMP not only serves as the skin-like ridge to deform according to external topology but also provides the magnetized source with defined north/south (N/S) poles via incorporation of NdFeB microparticles. , After the current signals are converted into the frequency domain by fast Fourier transform (FFT), the characteristic frequency value can represent the eigenfrequency of the MMP, which is applied as the factor to determine the existence of the convex pattern at the corresponding region. For a surface with built-in information, e.g.…”

Section: Results and Discussionmentioning

confidence: 99%

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Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Fang,

Ding,

Zhou

et al. 2023

ACS Nano

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Exploring flexible tactile sensors capable of recognizing surface information is significant for the development of virtual reality, artificial intelligence, soft robotics, and human−machine interactions (HMI). However, it is still a challenge for current tactile sensors to efficiently recognize the surface pattern information while maintaining the simplicity of the overall system. In this study, cantilever beam-like magnetized micropillars (MMPs) with height gradients are assembled as a position-registered array for rapid recognition of surface pattern information. After crossing the surface location with convex patterns, the deformed MMPs undergo an intrinsic oscillating process to induce damped electrical signals, which can then be converted to a frequency domain for eigenfrequency extraction. Via precisely defining the specific eigenfrequencies of different MMPs, position mapping is realized in crosstalkfree behavior even though all signals are processed by one communication channel and a pair of electrodes. With a customized LabVIEW program, the surface information (e.g., letters, numbers, and Braille) can be accurately reconstructed by the frequency sequence produced in a single scanning procedure. We expect that the proposed interface can be a convenient and powerful platform for intelligent surface information perception and an HMI system in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Fang,

Ding,

Zhou

et al. 2023

ACS Nano

View full text Add to dashboard Cite

show abstract

“…Sensors 2024, 24, x FOR PEER REVIEW 2 of 10 measurements [15,16]. Inline applications require special hardware geometry for flowthrough measurements.…”

Section: Methodsmentioning

confidence: 99%

NMR in Battery Anode Slurries with a V-Shaped Sensor

Schmid,

Kontschak,

Nirschl

et al. 2024

Sensors

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Inline analytics in industrial processes reduce operating costs and production rejection. Dedicated sensors enable inline process monitoring and control tailored to the application of interest. Nuclear Magnetic Resonance is a well-known analytical technique but needs adapting for low-cost, reliable and robust process monitoring. A V-shaped low-field NMR sensor was developed for inline process monitoring and allows non-destructive and non-invasive measurements of materials, for example in a pipe. In this paper, the industrial application is specifically devoted to the quality control of anode slurries in battery production. The characterization of anode slurries was performed with the sensor to determine chemical composition and detect gas inclusions. Additionally, flow properties play an important role in continuous production processes. Therefore, the in- and outflow effects were investigated with the V-shaped NMR sensor as a basis for the future determination of slurry flow fields.

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“…When designing an RF coil to be used in conjunction with the current magnet, three practical considerations must be taken into account [ 22 , 23 , 24 ]. First, the coil must generate a sensitivity spot of 10 mm × 10 mm at z = 6 mm, where the magnet provides a homogeneous magnetic field on the XOY plane.…”

Section: Methodsmentioning

confidence: 99%

Optimized Unilateral Magnetic Resonance Sensor with Constant Gradient and Its Applications in Composite Insulators

Guo

Yang

et al. 2023

Sensors

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In this study, an optimized unilateral magnetic resonance sensor with a three-magnet array is presented for assessing the aging of composite insulators in power grids. The sensor’s optimization involved enhancing the static magnetic field strength and the homogeneity of the RF field while maintaining a constant gradient in the direction of the vertical sensor surface and maximizing homogeneity in the horizontal direction. The center layer of the target area was positioned 4 mm from the coil’s upper surface, resulting in a magnetic field strength of 139.74 mT at the center point of the area, with a gradient of 2.318 T/m and a corresponding hydrogen atomic nuclear magnetic resonance frequency of 5.95 MHz. The magnetic field uniformity over a 10 mm × 10 mm range on the plane was 0.75%. The sensor measured 120 mm × 130.5 mm × 76 mm and weighed 7.5 kg. Employing the optimized sensor, magnetic resonance assessment experiments were conducted on composite insulator samples utilizing the CPMG (Carr–Purcell–Meiboom–Gill) pulse sequence. The T2 distribution provided visualizations of the T2 decay in insulator samples with different degrees of aging.

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A portable, submersible, MR sensor – The Proteus magnet

Cited by 14 publications

References 26 publications

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

NMR in Battery Anode Slurries with a V-Shaped Sensor

Optimized Unilateral Magnetic Resonance Sensor with Constant Gradient and Its Applications in Composite Insulators

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