Giant magneto-impedance sensor with working point selfadaptation for unshielded human bio-magnetic detection

Han, Changlin; Tang, Jingsheng; Liu, Yadong; Zhou, Zongtan

doi:10.1016/j.vrih.2022.01.003

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…Along these lines, the manuscript shows the originally captured units (Volts) as the most representative means to represent the recorded MCG signal. As such, when voltage is used as the direct means of measurement, such conversion is not typically adapted in the literature [ 14 , 34 , 35 , 36 ].…”

Section: Discussionmentioning

confidence: 99%

Real-Time Magnetocardiography with Passive Miniaturized Coil Array in Earth Ambient Field

Zhu

Kiourti

2023

Sensors

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We demonstrate a magnetocardiography (MCG) sensor that operates in non-shielded environments, in real-time, and without the need for an accompanying device to identify the cardiac cycles for averaging. We further validate the sensor’s performance on human subjects. Our approach integrates seven (7) coils, previously optimized for maximum sensitivity, into a coil array. Based on Faraday’s law, magnetic flux from the heart is translated into voltage across the coils. By leveraging digital signal processing (DSP), namely, bandpass filtering and averaging across coils, MCG can be retrieved in real-time. Our coil array can monitor real-time human MCG with clear QRS complexes in non-shielded environments. Intra- and inter-subject variability tests confirm repeatability and accuracy comparable to gold-standard electrocardiography (ECG), viz., a cardiac cycle detection accuracy of >99.13% and averaged R-R interval accuracy of <5.8 ms. Our results confirm the feasibility of real-time R-peak detection using the MCG sensor, as well as the ability to retrieve the full MCG spectrum as based upon the averaging of cycles identified via the MCG sensor itself. This work provides new insights into the development of accessible, miniaturized, safe, and low-cost MCG tools.

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Section: Discussionmentioning

confidence: 99%

Real-Time Magnetocardiography with Passive Miniaturized Coil Array in Earth Ambient Field

Zhu

Kiourti

2023

Sensors

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“…Flexible substrates normally are more rugged, lighter, portable, higher in thermal and chemical stability, and less expensive to manufacture compared to their rigid substrate counterparts. Due to the advantages of flexible substrates, the potential impacts of flexible magnetoelectronic devices on physiological health detection, human–computer interaction, and touch displays have received increasing attention [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Giant Magnetoimpedance Effect of Multilayered Thin Film Meanders Formed on Flexible Substrates

et al. 2023

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The giant magnetoimpedance effect of multilayered thin films under stress has great application prospects in magnetic sensing, but related studies are rarely reported. Therefore, the giant magnetoimpedance effects in multilayered thin film meanders under different stresses were thoroughly investigated. Firstly, multilayered FeNi/Cu/FeNi thin film meanders with the same thickness were manufactured on polyimide (PI) and polyester (PET) substrates by DC magnetron sputtering and MEMS technology. The characterization of meanders was analyzed by SEM, AFM, XRD, and VSM. The results show that multilayered thin film meanders on flexible substrates also have the advantages of good density, high crystallinity, and excellent soft magnetic properties. Then, we observed the giant magnetoimpedance effect under tensile and compressive stresses. The results show that the application of longitudinal compressive stress increases the transverse anisotropy and enhances the GMI effect of multilayered thin film meanders, while the application of longitudinal tensile stress yields the opposite result. The results provide novel solutions for the fabrication of more stable and flexible giant magnetoimpedance sensors, as well as for the development of stress sensors.

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“…The precise measurement of weak magnetic fields is the key to solving problems in many basic and applied disciplines, such as geophysics [1,2], archeology [3,4], cosmophysics [5,6], and biophysics [7]. Common weak magnetic sensors include atomic magnetometers [8], induction magnetometers [9,10], fluxgate magnetometers [11], proton magnetometers [12], superconducting quantum interference devices [13,14], anisotropic magnetoresistance magnetometers [15], planar Hall effect magnetometers [16], giant magnetoimpedance magnetometers [17], etc. Due to their different characteristics, various weak magnetic sensors are widely used in different fields.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress of Atomic Magnetometers for Geomagnetic Applications

Zhao

Zhu

et al. 2023

Sensors

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The atomic magnetometer is currently one of the most-sensitive sensors and plays an important role in applications for detecting weak magnetic fields. This review reports the recent progress of total-field atomic magnetometers that are one important ramification of such magnetometers, which can reach the technical level for engineering applications. The alkali-metal magnetometers, helium magnetometers, and coherent population-trapping magnetometers are included in this review. Besides, the technology trend of atomic magnetometers was analyzed for the purpose of providing a certain reference for developing the technologies in such magnetometers and for exploring their applications.

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Giant magneto-impedance sensor with working point selfadaptation for unshielded human bio-magnetic detection

Cited by 9 publications

References 16 publications

Real-Time Magnetocardiography with Passive Miniaturized Coil Array in Earth Ambient Field

Real-Time Magnetocardiography with Passive Miniaturized Coil Array in Earth Ambient Field

Giant Magnetoimpedance Effect of Multilayered Thin Film Meanders Formed on Flexible Substrates

Recent Progress of Atomic Magnetometers for Geomagnetic Applications

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