Fig. 1. Schematic diagram of displacement sensor structure of fiber bending loss

Fig. 2. Displacement transfer principle of the main rack for displacement sensor of fiber bending loss

Fig. 3. Waveguide radiation of the bending optical fiber

Fig. 4. Relationship between macro-bending loss per unit length and bending diameter

Fig. 5. Fiber details in sensor

Fig. 6. Calibration experiment device of displacement sensor structure of fiber bending loss

Fig. 7. Optical loss and displacement test data. (a)Test 1; (b) test 2; (c) test 3; (d) test 4

Fig. 8. Performance testing of displacement sensor structure of fiber bending loss

Fig. 9. Influence of radius of curvature of U-type turning radius on the measurement precision of sensor