Microstructure Inspection Endoscope Optical Structure Research And Design

Optical system of a microstructure inspection endoscope supplied in micro-profile and micro-area (iatrical application and so on) is studied in this thesis. The system is based on directly imaging principle .The endoscope is designed mainly for fiber connector FC&SC in common communication equipments .The inspection head of the endoscope can be put into 2.5- millimeter-diameter micro-pore. Nowadays most of similar instruments abroad are relatively big,and its number aperture and view field are restricted by small dimension of micro-pore. They merely detect fiber end contamination. According to the limits mentioned above, expanding utility and applied optics theory, the demands of instrument structure should be satisfied:1. Instrument Micromation. The instrument has advantages of handability and portability. It is used not only in inspection of fiber connector pore but also in iatrical application .The head of endoscope detector ensures un restricted number aperture and certain view range of the small lens.2.Rough observation at low- magnification and particularly inspection at high- magnification. The system includes low- magnification lens and high- magnification zoom lens. Its number aperture is limited by pore diameter. Both of the two lenses part can be used separately. Higher magnification is gained by joining two parts into one whole system. Direct observation by eyes need an eye lens .The amplificatory image also can be received by CCD, and be processed by computer. The subdivision principles of area CCD are applied in order to meet the resolution require of high-magnification zoom lens.3.Common illumination merely cares opaque contamination .A phase contrast illumination is applied in the system in order to observe phase contamination.4. Collimation of detail outside the middle of view field. Motion of the noticeable part is obtained by means of small slab in the scan system.5.The whole design focuses on Micromation in order to meet requires mentioned above. Mechanism, optics, electro-circuit and CCD camera are integrated into a small cubage and a durable hand weight. The main works of the thesis:Analysis of fiber end inspection methods. The design idea and the schematic diagram of optical system are given for two kinds of fiber connector and its working condition. Multi-function supplication of optical system is studied.Object lenses and kohler illumination system are designed based on application optics theory. Splitting and linking of zoom lens, scan system is studied. Fixed focus object lens, zoom lens, eye lens and illuming lens are developed. Their structures forms are selected. Optical path optimization is accomplished. A set of dual moved module zoom system is designed. A phase contrast illumination is analyzed based on physical optics theory. Calculation of illumination energy is completed. Mechanical structure of microstructure endoscopes is developed. The error analysis method based on dimensional chain theory is described and the error of optical & mechanical structure is emphatically discussed by the method.The subdivision principles of area CCD are described in view of hardware & software of circuit and camera system configuration.