Ultrasensitive Magnetoelectric Sensing System for Pico-Tesla MagnetoMyoGraphy

Zuo, Siming; Schmalz, Julius; Ozden, Mesut-Omur; Gerken, Martina; Su, Jingxiang; Niekiel, Florian; Lofink, Fabian; Nazarpour, Kianoush; Heidari, Hadi

doi:10.1109/tbcas.2020.2998290

Cited by 47 publications

(36 citation statements)

References 84 publications

(78 reference statements)

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“…2 d) for the direct detection in resonance. The voltage sensitivity and the limit of detection are in the same range but slightly improved compared to recent values of smaller, externally biased devices 36 . It is worth noting that the ac magnetic field is damped due to the − 3 dB cut-off frequency of the brass cylinder at 1.5 kHz.…”

Section: Resultsmentioning

confidence: 54%

Exchange biased delta-E effect enables the detection of low frequency pT magnetic fields with simultaneous localization

Spetzler

Bald

Durdaut

et al. 2021

Sci Rep

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Delta-E effect sensors are based on magnetoelectric resonators that detune in a magnetic field due to the delta-E effect of the magnetostrictive material. In recent years, such sensors have shown the potential to detect small amplitude and low-frequency magnetic fields. Yet, they all require external magnetic bias fields for optimal operation, which is highly detrimental to their application. Here, we solve this problem by combining the delta-E effect with exchange biased multilayers and operate the resonator in a low-loss torsion mode. It is comprehensively analyzed experimentally and theoretically using various kinds of models. Due to the exchange bias, no external magnetic bias fields are required, but still low detection limits down to $${{\text{350 pT}} \mathord{\left/ {\vphantom {{\text{350 pT}} {\sqrt {{\text{Hz}}} }}} \right. \kern-\nulldelimiterspace} {\sqrt {{\text{Hz}}} }}$$ 350 pT / Hz at 25 Hz are achieved. The potential of this concept is demonstrated with a new operating scheme that permits simultaneous measurement and localization, which is especially desirable for typical biomedical inverse solution problems. The sensor is localized with a minimum spatial resolution of 1 cm while measuring a low-frequency magnetic test signal that can be well reconstructed. Overall, we demonstrate that this class of magnetic field sensors is a significant step towards first biomedical applications and compact large number sensor arrays.

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Section: Resultsmentioning

confidence: 54%

Exchange biased delta-E effect enables the detection of low frequency pT magnetic fields with simultaneous localization

Spetzler

Bald

Durdaut

et al. 2021

Sci Rep

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“…♦ Unencapsulated weight 1.2 g. Backpack weight is estimated at circa 6 g, although battery size may need to be increased to extend system operation time. and magnetic recording [51], [52] can potentially address the limitation of electrical interfacing with the neural and muscular systems.…”

Section: Discussionmentioning

confidence: 99%

SenseBack - An Implantable System for Bidirectional Neural Interfacing

Williams

Brunton

Rapeaux

et al. 2020

IEEE Trans. Biomed. Circuits Syst.

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Chronic in-vivo neurophysiology experiments require highly miniaturized, remotely powered multi-channel neural interfaces which are currently lacking in power or flexibility post implantation. To resolve this problem we present the Sense-Back system, a post-implantation reprogrammable wireless 32channel bidirectional neural interfacing that can enable chronic peripheral electrophysiology experiments in freely behaving small animals. The large number of channels for a peripheral neural interface, coupled with fully implantable hardware and complete software flexibility enable complex in-vivo studies where the system can adapt to evolving study needs as they arise. In complementary ex-vivo and in-vivo preparations, we demonstrate that this system can record neural signals and perform highvoltage, bipolar stimulation on any channel. In addition, we demonstrate transcutaneous power delivery and Bluetooth 5 data communication with a PC. The SenseBack system is capable of stimulation on any channel with ±20 V of compliance and up to 315 µA of current, and highly configurable recording with perchannel adjustable gain and filtering with 8 sets of 10-bit ADCs to sample data at 20 kHz for each channel. To our knowledge this is the first such implantable research platform offering this level of performance and flexibility post-implantation (including complete reprogramming even after encapsulation) for small animal electrophysiology. Here we present initial acute trials, demonstrations and progress towards a system that we expect to enable a wide range of electrophysiology experiments in freely behaving animals.

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“…However, the high cost of the devices and the complexity of the setup (requiring a temperature-controlled environment with the removal of the environment noise) limit the spread of this sensing technique. Multiple biomagnetic sensing techniques offer more straightforward implementation when compared with SQUIDs, such as highly sensitive Hall-sensors [ 132 , 135 , 136 ], Optically Pumped Magnetometers [ 137 ] (OPM) and other [ 132 ]. Heidari et al [ 135 ] implemented a compact CMOS Hall-sensor, potentially making MMG more affordable for use in wearable devices and prosthetics.…”

Section: Promising Control Approachesmentioning

confidence: 99%

“…However, a system for noise-cancellation remains unsolved. Zuo et al continued developing highly sensitive compact sensors for MMG and discussed a potential implementation of miniaturised MMG systems for further implantation into muscles [ 132 , 136 ] (however, this was not clinically tested).…”

Section: Promising Control Approachesmentioning

confidence: 99%

Control Methods for Transradial Prostheses Based on Remnant Muscle Activity and Its Relationship with Proprioceptive Feedback

Grushko

Spurný

Černý

2020

Sensors

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The loss of a hand can significantly affect one’s work and social life. For many patients, an artificial limb can improve their mobility and ability to manage everyday activities, as well as provide the means to remain independent. This paper provides an extensive review of available biosensing methods to implement the control system for transradial prostheses based on the measured activity in remnant muscles. Covered techniques include electromyography, magnetomyography, electrical impedance tomography, capacitance sensing, near-infrared spectroscopy, sonomyography, optical myography, force myography, phonomyography, myokinetic control, and modern approaches to cineplasty. The paper also covers combinations of these approaches, which, in many cases, achieve better accuracy while mitigating the weaknesses of individual methods. The work is focused on the practical applicability of the approaches, and analyses present challenges associated with each technique along with their relationship with proprioceptive feedback, which is an important factor for intuitive control over the prosthetic device, especially for high dexterity prosthetic hands.

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Ultrasensitive Magnetoelectric Sensing System for Pico-Tesla MagnetoMyoGraphy

Cited by 47 publications

References 84 publications

Exchange biased delta-E effect enables the detection of low frequency pT magnetic fields with simultaneous localization

Exchange biased delta-E effect enables the detection of low frequency pT magnetic fields with simultaneous localization

SenseBack - An Implantable System for Bidirectional Neural Interfacing

Control Methods for Transradial Prostheses Based on Remnant Muscle Activity and Its Relationship with Proprioceptive Feedback

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