Fig. 1. Structural diagram of FBG inclinometer

Fig. 2. Force analysis diagrams of FBG inclinometer. (a) FBG inclinometer in horizontal position; (b) FBG inclinometer with tilt angle of θ

Fig. 3. Simulation results of fiber axial strain when inclinometer is tilted. (a) When inclinometer is horizontal; (b) when tilt angle of sensor is 15°; (c) when tilt angle of sensor is -15°

Fig. 4. Relationship between change of wavelength difference of inclinometer and tilt angle

Fig. 5. 3D dimension of inclinometer

Fig. 6. Schematic diagram of assembly process of inclinometer. (a) Attach mass block to support frame; (b) fix two bearings on rotating shaft; (c) fix one end of rotating shaft; (d) fixed rotating shaft

Fig. 7. Fiber prestressing implementation scheme. (a) Actual device diagram; (b) operational diagram

Fig. 8. Testing device of inclinometer

Fig. 9. Variations of FBG reflectance spectra with tilt angle θ. (a) Negative inclination; (b) positive inclination

Fig. 10. Relationship between change of wavelength difference of FBG and tilt angle. (a) Comparison of experimental test and simulation analysis; (b) hysteresis test

Fig. 11. Temperature test results. (a) Heating process; (b) cooling process

Fig. 12. Creep resistant performance test of inclinometer