A novel optical-fiber sensor used for inspecting the complex internal contours is presented. Based on the spoke-like arrangement of the fibers

the sensor of this kind can compensate the impacts caused by the variation of the surface reflectivity and the fluctuation of the light source. The characteristics of the sensor used for inspecting the curved surface are analyzed. And the simulation results prove the feasibility of the sensor. It has the performance of compact structure

non-contact measure

antijamming to electromagnetism. The results can provide an essential theoretical basis and design basis for measuring the curved surface and workpiece with reflective optical-fiber sensor.