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Optical coherence tomography (Optical Coherence Tomography, OCT) technology is a new medical imaging method , based on the principle of low coherence interferometry , the available biological tissues subsurface high - resolution cross-sectional images . OCT system with high resolution , high sensitivity , no radiation , no damage , etc. , have been widely used in ophthalmology, dermatology , cardiology , dental and other medical diagnostic field , has broad clinical and research prospects . Improve imaging speed of OCT system is conducive to the online detection of biological organization , reduce the impact of the life activities of biological organization OCT system . The papers on the basis of preliminary studies in the laboratory , according to the basic principle of the OCT system , the completion of the all-fiber high - speed time domain OCT system developed for accurate, high - speed imaging of biological tissue . The completed work in this paper are as follows : 1 , design the structure of the optical path of the fiber-optic high-speed time domain OCT system , matching system Michelson interferometer optical path to test the performance of the fiber stretcher , choose the appropriate working conditions . 2 , an all-fiber OCT system Michelson interferometer arms dispersion differential line measurement method based on frequency domain interference and non-linear curve fitting interferometer arm , according to the measurement results of non-zero dispersion shifted Fibre poor dispersion compensation . 3, according to the characteristics of the signal of the all-fiber high - speed time-domain OCT system design includes a filtering circuit , a logarithmic amplification circuit and a signal processing circuit and an amplifying circuit . 4 , in accordance with the the the OCT system synchronization control theory , design FPGA-based synchronization control circuit so that the system of data collection , longitudinal scanning , horizontal scanning part can be synchronized to work . Both FPGA and computer communications to facilitate the remote control and the actual use of the system . 5 , the use of isolated human teeth , artificial caries in vitro tooth caries teeth and dental restorative material as experimental samples , and compared with the experimental results of the original low-speed OCT system .
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