由於居家照護漸漸的受到重視，使無所不在的生理量測系統快速發展。而本研究開發了一套非直接接觸式的心電信號量測系統，並探討不同因素對於訊號所造成之影響。在電極大小方面我們準備了五種面積不同之參考電極作量測，結果顯示這五種電極面積大小對於R波之振幅並無顯著之影響。而在衣服厚度方面，我們準備了0.7 mm之棉質衣服四件，並分別穿著不同件數之衣服作量測，結果顯示較厚的衣服容易使訊號耦合較多之60 Hz雜訊。衣服材質方面，我們分別穿上棉質、聚酯纖維等衣物作量測，結果顯示棉質的衣物容易得到最穩定且雜訊最低之訊號。最後對本研究之心跳檢測系統作準確度分析，受測者共為20人，其中包含了17位男生及3位女生，實驗結果顯示心跳的誤差平均僅有1 bpm。

In this thesis, we developed a non-direct contact ECG measurement system, and discussed different factors may affect the signal quality. We used five electrodes of different size to measure ECG signal. The results shown there are no significant affect R-peak amplitude. Then we used four thicknesses of 0.7mm cotton clothes, to discuss the influence of thickness to the signal. The results shown thicker clothes couple more 60Hz noise than thinner one. In different clothes materials, we wore cotton and polyester clothes separately. The results shown the cotton clothes have the most stable signal and the noise was smallest. Finally, we made an accuracy of heart rate detection analysis. We invited 20 subjects, and there were 17 males and 3 females. The experiment results shown the average error of heart rate detection is 1 bpm.

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