具高敏感度及高訊雜比之非接觸式電容性生醫感測器研製 ; Design of Non-Contact Capacitive Bio-Sensor with High Sensitive and High SNR

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Title:	具高敏感度及高訊雜比之非接觸式電容性生醫感測器研製;Design of Non-Contact Capacitive Bio-Sensor with High Sensitive and High SNR
Authors:	陳冠樺;Kuan-hua Chen
Contributors:	電機工程研究所
Keywords:	電容性感測;高輸入阻抗;非接觸電極;心電訊號;ECG;non-contact electrode;Capacitive sensor;high-input impedance
Date:	2010-07-19
Issue Date:	2010-12-09 13:52:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	本文設計一新式的非接觸生醫感測器，在使用時可以提高量測時的方便性、安全性，不需與皮膚直接接觸，並且能做長時間量測生理訊號。設計依據是依電容性耦合訊號的原理來製作一個非接觸生醫感測器；但生理訊號通常都相當微弱，為了使訊號不受到衰減且能清楚的辨識，而此感測器具有下列優點： (1) 能濾除直流偏壓且不影響輸入端的阻抗。 (2) 感測器具有高敏感度。 (3) 感測器具有高訊雜比。 (4) 外部屏蔽層，增加抗雜訊的強度。　　最後本文將實現所提出之非接觸生理訊號量測系統，並利用本文所設計的新式生理訊號感測器進行實際心電訊號量測，來驗證其正確性，實驗結果證實本論文提出之方法與可行性。The purpose of this paper is to design a novel capacitive coupling sensor which provides a convenient, secure, and noncontact measurement for human bio-signal. It is useful for the long-term bio-signal measurement. The method is based on the principle of capacitive coupling to sense bio-signals. However, bio-signals are usually extremely weak. It becomes more difficult to measure bio-signals when using noncontact method. Therefore, this research addresses a new noncontact biomedical sensor having the following four advantages: (1) Eliminating DC-bias without affecting the input impedance (2) High sensitivity (3) High signal-to-noise ratio (SNR) (4) Reducing interference by making an external shielding Finally, a non-contact electrocardiogram (ECG) measurement system is designed to verify the feasibility of the proposed capacitive coupling sensor. The presented sensor can be extended to other physiological signal measurement systems.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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