| Summary: | 碩士 === 國立交通大學 === 電機與控制工程系所 === 96 === Photoplethysmography (PPG) is the combinational results that the surface of skin reflects and absorbs the light with different wavelengths, and it also associated with the pulsatile of blood in the blood capillaries. As the results, the signals of PPG are generated. According to above, there must be some intimate relationship between PPG and the microcirculation system of derma. Otherwise, all of the circulator systems in body are coming from a heart, and the conventional observation method to hearts and autonomic nerves system is heart rate variability (HRV) of electrocardiogram (ECG). The conventional measurement of ECG must use gel electrodes attached to subjects. This will cause the subjects discomfort and inconvenient. Therefore, the relationship between ECG and PPG is discussed and researched in this study. According to the measurement of PPG by infrared LED, the HRV of those two signals will be derived, and then the similarities and dissimilarities are compared. Based on the result of analysis, this study wishes to replace the conventional ECG by PPG.
Furthermore, a novel PPG array system is proposed in this study. In consideration of cost efficiency and convenience, the dermis and subcutis could be examined simply by the 3D PPG graph derived from the proposed PPG array system. According to the amplitude of 3D PPG waveforms, the situation of skin could be evaluated that the worse skin processes the larger standard deviation of amplitude.
In the future, PPG array system will be improved and a PPG lotion mask will be expected to implement. The novel mask could do skin diagnosis to subjects. Otherwise, based on the novel mask the quality of skin will be promoted with different wavelengths and power of lights.
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