Xue Zou, Junhao Fan, Binbin Luo, Fumin Zhou, Decao Wu, Zufan Zhang, Mingfu Zhao. Dual-Channel Reflective Optical Microfiber Coupler Diaphragms for Continuous and Accurate Blood Pressure Monitoring[J]. Acta Optica Sinica, 2024, 44(7): 0728001
- Acta Optica Sinica
- Vol. 44, Issue 7, 0728001 (2024)
Fig. 1. Diagram of structure. (a) Structure of R-OMC; (b) R-OMC under microscope; (c) structure of sensor chip; (d) complete sensor chip
Fig. 2. Mechanical simulation of package structure. (a) Pressure from multiple directions; (b) pressure from single direction
Fig. 3. Vertical displacement of bottom layer of PDMS
Fig. 4. Testing system for performance of R-OMCSC
Fig. 5. Characteristics of R-OMCSC. (a) Pressure sensitivity; (b) voltage change of pressure applied at different locations; (c) response time; (d) repeatability; (e) different detection locations in radial artery; (f) pulse waves at different locations of human pulse
Fig. 6. Typical pulse waveform of brachial artery and radial artery
Fig. 7. Dual-channel pulse wave detection method
Fig. 8. Pulse wave preprocessing process
Fig. 9. Grid search results for c and g. (a) SBP model; (b) DBP model
Fig. 10. Output of SVR prediction model. (a) SBP model; (b) DBP model
Fig. 11. Correlation plots and Bland-Altman plots of dual-channel BP detection model based on SVR. (a)(c) SBP model; (b)(d) DBP model
Fig. 12. Changes of BPand K value. (a) Different times in one day; (b) exercise time
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Table 1. Measurement range of RPTT, BPTT, and DBRPTT
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Table 2. Performance comparison with other blood pressure sensors
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