Fig. 1. Relationship between γ and bending radius

Fig. 2. Schematic diagram of bent fiber

Fig. 3. Functional block diagram of pulse signal acquisition system

Fig. 4. Part of pulse signal diagram collected by labview

Fig. 5. Complete pulse wave waveform

Fig. 6. Pulse signal diagram before and after denoising based on wavelet transform. (a) Before denoising; (b) after denoising

Fig. 7. Pulse signal diagram before and after removing baseline drift. (a) Before removing baseline drift; (b) after removing baseline drift

Fig. 8. Pulse signal diagram of young male at rest

Fig. 9. Pulse signal diagram of young male after exercise

Fig. 10. Pulse signal diagram of middle-aged people

Fig. 11. Pulse signal diagram of young female at rest

Fig. 12. Recognition of pulse wave points b and c

Fig. 13. Recognition of pulse wave points f and g

Fig. 14. Pulse wave measured based on FBG and PPG. (a) FBG; (b) PPG