Fig. 1. Schematic diagram of the fiber optic fabric sensor. (a) Multi-layer structures of the sensor; (b) comparison of sensor before and after stretching

Fig. 2. Sensor theoretical analysis results. (a) Relationship between the tensile quantity ΔL of the basic element and the bending radius r; (b) simulation results of loss coefficient under different bending radius

Fig. 3. Laminated fiber optic fabric sensor preparation and sample repeatability testing. (a) Sensor preparation process; (b) schematic diagram of sensitive fiber sample ;(c) sensitive fiber bending radius r₀; (d) double row spacing h production measurement data

Fig. 4. Static response experiments of sensors. (a) Relative change in output power of the sensor under tension at N=6 and D₃ parameters of 5, 10 and 15 mm respectively; (b) relative change in output power of the sensor under tension at D₃=15 mm and N parameters of 2, 4 and 6 respectively; (c) experimental verification of unidirectional sensing

Fig. 5. Sensor tensile response curves. (a) Sensor A hysteresis test; (b) sensor B hysteresis test; (c) dynamic response experiment; (d) repeatability experiment

Fig. 6. Overall design of the respiratory monitoring garment. (a) Inside view of fabric; (b) combined view with sensor; (c) side view; (d) overall view of garment

Fig. 7. Breathing experiments based on smart clothing. (a) Respiratory test platform; (b) schematic diagram of different movement postures; (c) time-domain respiratory signals in different breathing patterns; (d) time-domain respiratory signals in different postures; (e) time-domain respiratory signals in different movement states

Table 1. Fiber optic fabric sensor bending radius r₀ and mean value and standard deviation of double row spacing h

Table 2. Comparison of respiration rate values for the measured samples and the standard equipment in static mode

Table 3. Comparison of static postural respiration rate values for measured samples and standard equipment

Table 4. Comparison of dynamic respiration rate values between measured samples and standard equipment