| Summary: | 碩士 === 南台科技大學 === 電機工程系 === 100 === Commercially available ECG measuring devices usually use three measuring points and require skin contact. It not only causes discomfort to users but also allergic reactions have been reported in certain cases. In order to address these flaws, researches on non-contact ECG measurement and related technologies have been on the rise. Although these devices can measure ECG without contact requirement and improve the comfort of users, the stability of the measurement is still an important factor. Hence, most of these devices still use three contact points that did not improve the convenience. Therefore, the current research uses an innovative design in the form of a non-contact single channel ECG sensor that can significantly improve the traditional electrodes. In this study, AC signal was used to excite the sensor. Excited AC signals are not only used as capacitive sensors to produce capacitive reactance but it can also reduce the interference caused by static friction. It was known that as the sensor approaches the chest area, the capacitive reactance of the sensor changes with a change in the electric field frequency of the ECG signal. The signal changed by the capacitive reactance is then carried on the carrier and AC signal thus improving the stability of the signal. And using a capacitance converter circuit the modified capacitive signal from the sensor is amplified. And finally, software filtering was used to demodulate the signal to view the user’s ECG signal. Measurement results can clearly manifest the R and T-waves of the ECG signal. In conclusion, the significant contribution of the current research is on the use of a single non-contact capacitive sensor to successfully measure ECG that can provide both convenience and comfort to users.
|
|---|
