Three-dimensional Morphology Of Fiber-optic Pins And The Detection Of Geometrical Parameters Of The Interferometer Developed

Connective precision is the great problem in the fiber optic connection, the surface topography and the geometrical parameters of the ferrule end-face are the key factor, which affecting the performance of connector and the stability of fiber optic system. Therefore it is necessary to measure the surface topography and the key geometrical parameters to provide the details of polishing, including: 3-D and 2-D imaging, radius of polishing, apex-offset, fiber height etc, and give a qualitative evaluation. This dissertation is aimed at the new methods and technique for measuring the surface topography of micron level regions to obtain the practical optics instrument, with electronic computer processing. After analyzing various methods used to measure the surface topography of micro-structures, we selected the Mirau type microscope interferometer system, with the Phase-shifting technique to obtain the surface topography. In this dissertation, we designed and manufactured the interferometer. This dissertation is composed of five chapters as follows:Chap. 1: The background of carrying out the interferometer for testing and measuring ferrule end-face is introduced. The main developments, current statue and future tendency of this interferometer are summarized. Then the major objective, works and significance of this dissertation are outlined.Chap. 2: The fundamental theoretics of designing interferometer is introduced, including two parts: the approach of measuring ferrule end-face, and the algorithms of phase-shifting interferometry. The former includes the definition of the geometrical parameters, the description of measuring the object, 3D reconstruction, and the calculation of the geometrical parameters. The later involves phase-measurement technique, piezoelectricity micro-displacement control technique, and phase-unwrapping algorithms.Chap. 3: The design of the hardware of this interferometer. The measurement for this interferometer is first selected, and then the interferometer is designed, including: the principle, the illuminating system, the Mirau type microscope interferometer system, the machine and its adjustment.Chap. 4: The circuit and the software of this interferometer are designed. In the circuit part, the control principle is designed first, then the main components are introduced simply.In the software part, the function of the program are completed first, then the display subroutine, the file manage subroutine, the test subroutine, the calculation subroutine are designed.Chap. 5: The experimentation about this interferometer are completed, the results of the test part and the corresponding analysis are given, then the conclusions are made, and the further improvements in the future are also proposed.