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

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姓名

陳冠樺(Kuan-hua Chen) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

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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摘要(中)

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。

摘要(英)

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.

關鍵字(中)

★ 電容性感測
★ 高輸入阻抗
★ 非接觸電極
★ 心電訊號

關鍵字(英)

★ ECG
★ non-contact electrode
★ Capacitive sensor
★ high-input impedance

論文目次

摘要----------------------------------------------I
ABSTRACT------------------------------------------II
誌謝----------------------------------------------III
目錄----------------------------------------------IV
圖目錄--------------------------------------------VII
表目錄--------------------------------------------X
第一章緒論---------------------------------------1
1.1 研究動機與目標--------------------------------1
1.2 文獻回顧--------------------------------------2
1.3 論文大綱--------------------------------------4
第二章研究背景與原理-----------------------------5
2.1 心電圖概論------------------------------------5
2.2 電容性耦合感測原理----------------------------8
2.3 硬體系統原理----------------------------------10
2.3.1 儀表放大器----------------------------------10
2.3.2 低通濾波器----------------------------------11
2.3.3 高通濾波器----------------------------------13
2.3.4 多重反饋式帶通濾波器------------------------15
2.4 雜訊干擾與處理--------------------------------17
第三章新式感測器之電路設計-----------------------19
3.1 傳統式電容性耦合感測器簡介--------------------19
3.2 新式感測器電路架構----------------------------23
3.2.1 感測器之高敏感度----------------------------24
3.2.2 感測器之新式等電位屏蔽設計------------------25
第四章量測電路設計與實現-------------------------26
4.1 量測系統電路架構------------------------------26
4.2類比訊號處理系統架構---------------------------27
4.2.1交流耦合網路---------------------------------27
4.2.2 前級差動放大器------------------------------31
4.2.3 四階帶通濾波器------------------------------34
4.2.4陷波濾波器-----------------------------------35
4.2.5 後級放大與箝位電路--------------------------37
4.2.6 電感電容式陷波濾波器------------------------38
4.3 數位訊號處理系統架構--------------------------42
4.3.1 系統架構與FPGA簡介--------------------------42
4.3.2 IIR低通數位濾波器設計---------------------44
第五章實現與驗證---------------------------------46
5.1 硬體電路實現----------------------------------46
5.1.1 具高敏感度及訊雜比的電容性感測器之實體電路--46
5.1.2 心電訊號量測之實體電路與波形驗證------------52
5.2 傳統式與新式電容性生醫感測器比較分析----------59
5.2.1 傳統式與新式電容性生醫感測器敏感度分析------59
5.2.2 傳統式與新式電容性生醫感測器訊雜比分析------60
5.2.3 使用不同型式感測器的全系統動態響應分析------63
5.3 實際生理訊號量測結果--------------------------66
5.3.1 實際量測心電訊號實驗方法與結果圖------------66
5.3.2 實際量測肌電訊號結果圖----------------------71
第六章結論與未來展望-----------------------------72
6.1 結論------------------------------------------72
6.2 未來展望--------------------------------------73
參考文獻------------------------------------------74
作者簡歷------------------------------------------78

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指導教授

徐國鎧(Kuo-kai Shyu)

審核日期

2010-7-19

推文