Fig. 1. Schematic diagram of the intensity-sensitized fiber curvature sensor

Fig. 2. Transmissivity simulation results of bending optical fiber versus curvature. (a) With different polished depths; (b) with different polished zone lengths

Fig. 3. Schematic diagram of structure and micrograph of sensitive area for curvature sensor based on rough side-polished single mode fiber. (a) Schematic diagram of structure, in which the inset shows the scattering of the polished area when red light is injected;(b)micrograph of sensitive area

Fig. 4. Schematic diagram of pulse self-referenced demodulation system

Fig. 5. Measurement system based on cantilever beam

Fig. 6. Sensor response curve

Fig. 7. Background noise of the demodulation system