1. 電容式生理訊號感測器之研製 Presenter: Rui-An Chang Adviser: Dr. Hung-Chi Yang Chairman: Dr. Hung-Chi Yang Date: 10.03.2012 1

2. Outline Introduction Paper Review Theoretical background Purposes Methods & Materials Future Works References 2

3. Introduction The traditional electrocardiogram instrument 3

4. Introduction Basic capacitive theory A: The area of the plates d: Distance between the plates Q: Quantity of charge ε: Dielectric of capacitor E: Electric field By Gauss' law 4

5. Introduction Basic capacitive sensor 5

6. Paper Review A Wireless Wearable ECG Sensor for Long- Term Applications A Wireless Wearable ECG Sensor for Long- Term Applications Ebrahim Nemati, M. Jamal Deen, and Tapas Mondal, McMaster University. IEEE Communications Magazine January 2012 6

7. Paper Review Wireless Non-contact Cardiac and Neural Monitoring Wireless Non-contact Cardiac and Neural Monitoring Yu M. Chi, Patrick Ng, UCSD, 2010 7

8. Purposes Purposes The purpose of this study for design the capacitive sensor and this sensor can measure physiological signal by single point. To compare with traditional Multi-point electrodes, this study will improve the patient uncomfortable and convenience. 8

9. Purposes The proposed capacitive sensor is used by the exch- anges signals to stimulate which use the relationship between the capacitance and electric field to sense physiological signals. 9

10. Theoretical background Capacitive reactance Capacitive reactance 一個理想電容器的阻抗是虛數，不具有實部，其虛 部稱為「容抗」，與訊號的角頻率成反比，其容抗 Xc 為 10

11. Theoretical background Capacitive reactance conversion circuit Capacitive reactance conversion circuit Vc ：激發交流訊號 Sc ：本研究的電容式電極 C1 ：回授電容 11

12. Methods & Materials System Architecture Body Clothes Electrode Conversion circuit NI9234 Software filtering Result Excitation circuit 12

13. Methods & Materials Substrate FR4 ( ε r = 4.4, h = 1.6 mm) Software Altium Protel 99 SE LabView Hardware National Instruments NI9234 13

14. Methods & Materials Non-contact electrode Structure  Capacitive sensor design 15mm 3.5mm 9.63mm 1.87mm 14

15. Methods & Materials ReceiverPCNI9234Result NI9234 15

16. Methods & Materials 處理電路 電源 激發電路 電極 銅箔 Copper foil Conversion circuit Copper foil Excitation circuit Copper foil Power planes Electrode 16

17. Future Works Power supply. BNC Connector and Pin. Voltage regulator. Compiler the backend software. 17

18. References Ebrahim Nemati, M. Jamal Deen, and Tapas Mondal, McMaster University. IEEE Communications Magazine January 2012 Wireless Non-contact Cardiac and Neural Monitoring Yu M. Chi, Patrick Ng, UCSD, 2010 陳玉銘, “ 主動式電容式生理訊號感測器之研製 ” 南台科 技大學, 電機工程系, 碩士學位論,July,2012 18

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