八导脑电放大器
发布时间：2018-10-05 07:56
【摘要】：PET、fMRI、脑磁等高端设备在认知脑功能研究手段中，发挥着极其重要的作用。相比其他众多高端设备而言脑电图设备具有使用和维护成本较低、时间分辨率较高等特点，在常用的研究、诊断技术中受到了科研工作者和临床医生的广泛关注。本文设计了一种高性能，宽频段具有阻抗检测功能的八导脑电放大器。该脑电放大器前端采用高性能仪用运放AD8221，和16位D/A组成直流校正差分放大器。直流抵消后的脑电信号通过陷波器和有源低通滤波器接至电子开关。DSP控制电子开关和A/D转换循环采集八路脑电信号，同时DSP控制D/A进行直流校正。采样后的脑电信号通过USB2.0实时上传至上位机。上位机将采集到的脑电信号以文本形式存储至PC机。 为了验证脑电放大器的性能，我们记录了睁眼和闭眼的自发脑电。最后还将此脑电放大器接入我们实验室开发的SSVEP系统中，被试在进行视觉刺激时，我们设计的八导脑电放大器能够明显记录到稳态视觉诱发电位。因此，本文设计的八导脑电放大器可以应用于认知脑功能研究中，，还可为临床医生和BCI领域提供良好的研究平台。
[Abstract]:High-end equipment, such as PET,fMRI, plays an extremely important role in cognitive brain function research. Compared with many other high-end equipment, EEG equipment has the characteristics of low cost of use and maintenance, high time resolution and so on. It has been widely concerned by researchers and clinicians in the common research and diagnosis technology. In this paper, a high performance, wide band impedance detection EEE amplifier is designed. The front end of the EEG amplifier consists of a high performance operational amplifier AD8221, and a 16 bit D / A DC corrected differential amplifier. The EEG signal after DC cancellation is connected to the electronic switch by notch filter. DSP controls the electronic switch and the A / D converter circulates to collect eight EEG signals, while DSP controls D / A for DC correction. The sampled EEG signals are uploaded to the host computer by USB2.0 in real time. The upper computer stores the collected EEG signals in the form of text to the PC machine. To verify the performance of EEG amplifiers, we recorded spontaneous EEG of open and closed eyes. Finally, the EEG amplifier is connected to the SSVEP system developed by our laboratory. When the subjects are given visual stimulation, the eight conductance EEG amplifier we designed can record the steady-state visual evoked potential (VEP) obviously. Therefore, the eight-conductance EEG amplifier designed in this paper can be applied to cognitive brain function research and provide a good research platform for clinicians and BCI.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318
本文编号：2252599
[Abstract]:High-end equipment, such as PET,fMRI, plays an extremely important role in cognitive brain function research. Compared with many other high-end equipment, EEG equipment has the characteristics of low cost of use and maintenance, high time resolution and so on. It has been widely concerned by researchers and clinicians in the common research and diagnosis technology. In this paper, a high performance, wide band impedance detection EEE amplifier is designed. The front end of the EEG amplifier consists of a high performance operational amplifier AD8221, and a 16 bit D / A DC corrected differential amplifier. The EEG signal after DC cancellation is connected to the electronic switch by notch filter. DSP controls the electronic switch and the A / D converter circulates to collect eight EEG signals, while DSP controls D / A for DC correction. The sampled EEG signals are uploaded to the host computer by USB2.0 in real time. The upper computer stores the collected EEG signals in the form of text to the PC machine. To verify the performance of EEG amplifiers, we recorded spontaneous EEG of open and closed eyes. Finally, the EEG amplifier is connected to the SSVEP system developed by our laboratory. When the subjects are given visual stimulation, the eight conductance EEG amplifier we designed can record the steady-state visual evoked potential (VEP) obviously. Therefore, the eight-conductance EEG amplifier designed in this paper can be applied to cognitive brain function research and provide a good research platform for clinicians and BCI.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318
【参考文献】
相关期刊论文 前1条
1 王继军,张明岛;脑电Gamma共振信号在精神疾病中的研究应用[J];上海精神医学;2005年04期
本文编号：2252599
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