Development of pico tesla resolution amorphous wire magneto-impedance sensor for bio-magnetic field measurements
Development of pico tesla resolution amorphous wire magneto-impedance sensor for bio-magnetic field measurements
复制标题
开发用于生物磁场测量的皮特斯拉分辨率非晶线磁阻抗传感器
DOI：
10.1016/j.jmmm.2020.167148
复制
发表时间：
2020
影响因子：
2.7
通讯作者：
Jiaju Ma
中科院分区：
文献类型：
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作者：
T. Uchiyama;Jiaju Ma
为了在无屏蔽环境下实现室温脑磁图（MEG）和心磁图（MCG）测量，我们通过同步开关开发了一种高性能、皮特斯拉分辨率磁阻抗（MI）传感器系统，该系统具有峰对峰电压检测器。我们利用每个MI元件的时差测量来抑制低频噪声成分，提高传感器系统的稳定性，实现了高的场检测灵敏度和良好的线性度，噪声水平低于1 pT/Hz1/2。我们成功开发了一种Pk-pk dvd型MI传感器系统，旨在测量室温实时α节律信号，并证明了对自发脑活动的清晰灵敏度，信噪比约为8。在每次闭上眼睛的情况下，新MI传感器系统测量到的α节律的显著增强进一步证明这些记录的信号是自发的大脑活动发出的。同时，我们还通过pk-pk vd型MI传感器系统实现了MCG的实时测量，实时信噪比约为14 dB，并成功测量了MCG信号的T波和R波，平均周期超过10个，信噪比超过20 dB。
For achieving the room temperature magnetoencephalography (MEG) and magnetocardiography (MCG) measurements in an unshielded environment, we have developed a high performance, pico-tesla resolution magnetoimpedance (MI) sensor system with the peak-to-peak voltage detector, by synchronized switching. We have achieved a high field detection sensitivity with good linearity, and a noise level lower than 1 pT/Hz1/2, by utilizing the time-differential measurement in each MI element for suppressing the low frequency noise components and increasing the stability of sensor system. We have successfully developed a Pk–pk VD-type MI sensor system aiming to measure the room-temperature real-time alpha rhythm signals, and demonstrated a clear sensitivity for spontaneous brain activity with SNR of about 8. The considerable enhancement of alpha rhythm measured by new MI sensor system in each eyes-closed condition is further evidence that these recorded signals are emanating from spontaneous brain activity. Meanwhile, we have also achieved the real time MCG measurements via pk-pk VD-type MI sensor system, with a high real time SNR of about 14 dB, and successfully measured the T wave and R wave of MCG signals, in averaging over 10 cycles, with a high SNR of more than 20 dB.
影响因子：
2.1
作者：
Uchiyama, Tsuyoshi;Mohri, Kaneo;Nakayama, Shinsuke
通讯作者：
Nakayama, Shinsuke