Min Hu, Xia Xiao, Hang Song, Yu Liu. Microwave Non-Invasive Blood Glucose Detection Based on Debye Model[J]. Laser & Optoelectronics Progress, 2020, 57(23): 230401
- Laser & Optoelectronics Progress
- Vol. 57, Issue 23, 230401 (2020)
Fig. 1. Diagram of open-end coaxial probe measurement principle
Fig. 2. Experimental device. (a) Measurement equipment; (b) open-end coaxial probe; (c) network analyzer
Fig. 3. Dielectric properties of glucose aqueous solution with different concentrations. (a) Dielectric constant; (b) conductivity
Fig. 4. Fitting relation between Debye parameters and glucose aqueous solution concentration. (a)
Fig. 5. Single-order Debye model fitting of glucose aqueous solution with concentration of 200 mg·dl-1. (a) Dielectric constant; (b) conductivity
Fig. 6. Dielectric properties of five aqueous glucose solutions reconstructed by single-order Debye model. (a) Dielectric constant; (b) conductivity
Fig. 7. Five-layer earlobe electromagnetic model and transceiver antenna
Fig. 8. Single-order Debye model of skin and fat. (a) Dielectric constant; (b) conductivity
Fig. 9. Microwave signal transmitted by transmitting antenna. (a) Time domain diagram; (b) frequency domain diagram
Fig. 10. Changes of S21 at different glucose concentrations. (a) S21; (b) S21 difference; (c) absolute value of S21 difference
Fig. 11. Relationship between absolute value of S21 difference and glucose concentration at different frequency points. (a) 1.35 GHz; (b) 1.63 GHz; (c) 3.25 GHz; (d) 4 GHz
Fig. 12. Experimental environment. (a) Experimental device; (b) earlobe model and antenna
Fig. 13. Experimental measurement results. (a) S21; (b) S21 difference; (c) absolute value of S21 difference
Fig. 14. Relationship between absolute value of S21 difference and glucose concentration at different frequency points
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Table 1. Fitting parameters of single-order Debye model of glucose aqueous solution with different concentrations
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Table 2. Fitted RMSE of Debye model at different glucose concentrations
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Table 3. RMSE of quadratic polynomial fitting of Debye parameters
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Table 4. Single-order Debye parameters of skin and fat
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