Design And Optimization Of Reflective Optical Fiber Sensor System Probes

The micro-geometry of the surface of the part affects the mechanical properties of the part to a great extent.In recent years,non-contact online measurement has always been one of the most important topics for academic research.Reflective intensity modulated optical fiber sensor(RIM-FOS for short)has the advantages of simple structure,flexible design,etc.It is widely used in the measurement of physical quantities such as displacement,topography,and roughness.The performance of the fiber optic probe in RIM-FOS is one of the most important factors that determine the performance of the sensor.Therefore,it is necessary to innovate and improve the RIM-FOS fiber-optic probe and optimize its structure in order to improve RIM-FOS measurement performance.The dissertation studies and analyzes the development status of RIM-FOS at home and abroad,simultaneously analyzes the working principle of RIM-FOS.It also applies the slanted lens fiber to the fiber pairing,deduces the mathematical model of the inclined receiving fiber,and determines the design points of RIM-FOS.Through the single-mode fiber exit light field model,establish the RIM-FOS single fiber light intensity modulation function model,analyze the effect of different influence factors on the intensity modulation characteristics of RIM-FOS.Based on the light-emphasizing function model of a single fiber pair,a light-emphasizing function model of the fiber bundle is established,and a concave stepped RIM-FOS fiber-optic probe structure is proposed to determine the amount of misalignment versus intaglio level RIM-FOS fiber bundle intensity modulation.The influence of the characteristics,and analysis of the influence of the reflective surface(inclined reflective surface,concave reflective surface,convex reflective surface)on the probe structure,and then determine the specific parameters of the optical fiber probe end structure and the internal fiber,the traditional Fiber probe structure is improved.Finally,a RIM-FOS probe I with compensation function is designed to meet the requirements of engineering measurement.TheRIM-FOS probe I is manufactured and tested through experiments to verify the performance of the designed RIM-FOS probe and meet the measurement requirements.