Fig. 1. Demodulator optical path diagram

Fig. 2. Distribution curve of optical path difference on CCD

Fig. 3. Simulated images with different F-P cavity lengths. (a) L=637 µm; (b) L=633 µm; (c) L=629 µm

Fig. 4. Structure of pulse wave acquisition system. (a) Device schematic diagram; (b) physical diagram; (c) inside the demodulator; (d) internal structure of F-P sensor

Fig. 5. Signal acquired by CCD and its filtering processing. (a) Original signal; (b) signal frequency domain; (c) filtered signal

Fig. 6. Typical pulse waveform

Fig. 7. Pulse waves of different individuals in different states. (a) Pulse wave of the first young male at rest; (b) pulse wave of the first young male after exercise; (c) pulse wave of the second young male at rest; (d) pulse wave of the second young male after exercise; (e) pulse wave of a young female at rest