Integrated Pico-Tesla Resolution Magnetoresistive Sensors for Miniaturised Magnetomyography
Integrated Pico-Tesla Resolution Magnetoresistive Sensors for Miniaturised Magnetomyography
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DOI：
10.1109/embc44109.2020.9176266
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Siming Zuo;K. Nazarpour;T. Böhnert;E. Paz;P. Freitas;R. Ferreira;H. Heidari
中科院分区：
文献类型：
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作者：
Siming Zuo;K. Nazarpour;T. Böhnert;E. Paz;P. Freitas;R. Ferreira;H. Heidari
磁肌描记术（MMG）是测量人体骨骼肌中由电活动产生的磁信号。然而，目前开发的用于检测这种微小磁场的技术体积庞大，成本高昂，并且需要在温度受控的环境中工作。开发小型化、低成本、室温的磁传感器为这一领域的研究提供了一条新的途径。在这里，我们提出了一个集成的隧道磁阻（TMR）阵列的室温MMG应用。TMR传感器开发了低噪声模拟前端电路，以检测MMG信号，而无需以高信噪比进行平均。MMG是通过使用肌电图（EMG）信号作为触发器对信号进行平均来实现的。观察到200 pT和30 pT的振幅，对应于手紧张和放松的时期，这与基于有限元法（FEM）的肌肉模拟一致，考虑到从观察点到磁场源的距离的影响。
Magnetomyography (MMG) is the measurement of magnetic signals generated in the skeletal muscle of humans by electrical activities. However, current technologies developed to detect such tiny magnetic field are bulky, costly and require working at the temperature-controlled environment. Developing a miniaturized, low cost and room temperature magnetic sensors provide an avenue to enhance this research field. Herein, we present an integrated tunnelling magnetoresistive (TMR) array for room temperature MMG applications. TMR sensors were developed with low-noise analogue front-end circuitry to detect the MMG signals without and with averaging at a high signal-to-noise ratio. The MMG was achieved by averaging signals using the Electromyography (EMG) signal as a trigger. Amplitudes of 200 pT and 30 pT, corresponding to periods when the hand is tense and relaxed, were observed, which is consistent with muscle simulations based on finite-element method (FEM) considering the effect of distance from the observation point to the magnetic field source.