그림 1. 반사형과 투과형의 온도영향 (a) 반사형 (b) 투과형 Fig. 1. Temperature effect (a) Reflection-Type (b) Transmission-Type
그림 3. 실험용 반사형과 투과형 PPG 측정 장치 Fig. 3. Reflection and Transmission type devices for measurement
그림 2. PPG 신호와 1,2차 미분 Fig. 2. 1st and 2nd derivative of PPG signal
그림 4. 내부 온도 변화 Fig. 4. Internal temperature variation
그림 5. 반사형 측정 장치의 PPG 신호 Fig. 5. PPG signal of reflection-type device
그림 6. 투과형 측정 장치의 PPG 신호 Fig. 6. PPG signal of transmission-type device
그림 7. 반사형 측정 장치의 2차미분 신호 Fig. 7. 2nd derivative of reflection-type device
그림 8. 투과형 측정 장치의 2차미분 신호 Fig. 8. 2nd derivative of transmission-type device
표 1. 장치의 각 부분별 외부 온도 Table 1. Temperature of components
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