Lei Ding, Lie Yu, Qinlan Xie, Lanyan Zhu. Research on knee joint curvature detection system based on fiber optic MZI-BDB curvature sensor[J]. Infrared and Laser Engineering, 2021, 50(12): 20210195
- Infrared and Laser Engineering
- Vol. 50, Issue 12, 20210195 (2021)
Fig. 1. Schematic diagram of knee bend detection system
Fig. 2. (a) Schematic diagram of sensor package; (b) Schematic diagram of sensor is encapsulated and fixed on the knee joint
Fig. 3. Schematic diagram of the knee joint bending detection
Fig. 4. (a) Schematic diagram of the MZI-BDB sensor design; (b) Microscope image of the cross-sections of the eccentric core fiber
Fig. 5. Schematic diagram of bending simulation of MZI-BDB sensor
Fig. 6. Schematic diagram of MZI-BDB sensor characteristic detection device
Fig. 7. (a) Wavelength shifting variation of the resonance wave under different curvatures for bending directions of 0°, 90°, and 180°; (b) Wavelength shifting variation of the resonance wave under different temperatures
Fig. 8. Wavelength shift of the resonance wave of the MZI-BDB sensor. (a) Left knee joint bending; (b) Right knee joint bending
Fig. 9. Wavelength shift of the resonant Valley in the MZI-BDB sensor when the subjects are walking. (a) Right knee joint bending; (b) Left knee joint bending
Fig. 10. Installation structure diagram of photoelectric encoder
Fig. 11. Angle obtained through the optical-electricity encoders during walking: (a) Right knee joint; (b) Left knee joint
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