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