| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 106 === Electrocardiogram (ECG), electroencephalography (EEG), electromyogram (EMG), and etc. are important diagnosis instruments in clinics. Traditional instruments usually utilize wet type electrode for measuring biomedical signals. However, the use of wet type electrodes has to smear electrolyte gel on the measurement sites. The application of electrolyte gel is neither comfortable nor convenient. Especially, in EEG measurements, the electrolyte gel will inevitably make subject’s hairs dirty. This study aims to develop a high sensitive dry electrode for the measurement of electrophysiological signals. We have designed active electrode to increase the impedance in the frontal-end circuit. By providing active shield, external noise was decreased and common mode reject (CMRR) was increased to provide better impedance matching. The proposed dry electrode has proved its feasibility in the low-contact condition. Comparing the signal quality between our dry electrode and traditional wet-type electrode, the root-mean-square error (RMSE) is 0.28 mV which demonstrates the feasibility of our dry electrode for clinical applications.
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