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首页> 外文期刊>Journal of magnetism and magnetic materials >Development of pico tesla resolution amorphous wire magneto-impedance sensor for bio-magnetic field measurements
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Development of pico tesla resolution amorphous wire magneto-impedance sensor for bio-magnetic field measurements

机译：微微Tesla分辨率的开发用于生物磁场测量的非晶线磁阻传感器

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摘要

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/Hz~(1/2), 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.
机译：为了实现房间温度磁性脑图（MEG）和磁进地（MCG）测量在非屏蔽的环境中，我们通过同步切换开发了具有峰值峰值电压检测器的高性能，微观型磁阻磁阻（MI）传感器系统，通过同步开关。我们已经实现了具有良好线性的高场检测灵敏度，并且通过利用每个MI元件中的时间差测量来抑制低频噪声分量并增加噪声水平，并且通过每个MI元件中的时间差异测量来实现高于1pt / hz〜（1/2）。传感器系统的稳定性。我们已成功开发出一种PK-PK VD型MI传感器系统，旨在测量室温实时α节奏信号，并表现出具有约8的SNR的自发性脑活动的明显敏感性。测量的α节奏的相当大的增强通过新的MI传感器系统在每个眼睛闭合条件下进一步证明这些记录的信号从自发性脑活动中发出。同时，我们还通过PK-PK VD型MI传感器系统实现了实时MCG测量，具有大约14 dB的高实时SNR，并成功地测量了MCG信号的T波和R波，平均超过10循环，高SNR超过20 dB。

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