摘要光学相干层析系统（Optical Coherence Tomography）是20世纪90年代逐步发展而成的一种新的三维层析成像技术。OCT基于低相干干涉原理获得深度方向的层析能力，通过扫描可以重构出生物组织或材料内部结构的二位或三维图像，其信号对比度源于生物组织或材料内部光学反射（散射）特性的空间变化。频域OCT是一种将得到的数据进行进一步傅里叶变换的信号处理方法，从而获得深度上的层析信号。其具有扫描速率更快、灵敏度更高等优点，相较于传统的时域OCT系统而言，频域OCT的优势在于同时提取不同深度上反馈回来的信号进行处理，从而省略深度扫描装置。理论上提高检测和处理图像的速度。75019

本文着重分析频域OCT的成像原理、系统设计和处理数据的方法。在实验平台搭建一个较完善的实验系统并利用其获得相应实验图像。

本文在数据分析上，就新的插值算法进行了分析和实践。相比于旧方法，新的插值方法在初调时不必使用定标灯，并且在每次插值时减少一次差值步骤，从而在整体上大大提高运算效率。

毕业论文关键词：光学相干层析；频域OCT；LABVIEW；色散补偿；光谱插值

Design and Realization of Optical Coherence Tomography System

Abstract   Optical coherence tomography system is the 20th century, 90 years gradually developed from a new three-dimensional tomography technology。 OCT is based on the principle of low coherence to obtain the depth of the chromatographic ability, by scanning can be reconstructed biological tissue or material internal structure of the two or three-dimensional images, the signal contrast from the biological tissue or material internal optical reflection (scattering) Space change。 The frequency domain OCT is a signal processing method in which the obtained data is subjected to further Fourier transform, thereby obtaining a tomographic signal in depth。 Which has the advantages of faster scanning speed and higher sensitivity。 Compared with the traditional time-domain OCT system, the advantage of the frequency domain OCT is to extract the signals back to the different depths at the same time, so as to omit the depth scanning device。 Theoretically improve the speed of detecting and processing images。

This paper focuses on the imaging principle of frequency domain OCT, the method of system design and data processing。 In the experimental platform to build a better experimental system and use it to obtain the corresponding experimental images。

In this paper, the new interpolation algorithm is analyzed and practiced on the data analysis。 Compared with the old method, the new interpolation method does not need to use the calibration lamp at the time of initial adjustment, and reduces the difference step every time the interpolation, thus greatly improves the operation efficiency as a whole。

Key words: OCT; frequency domain OCT; LABVIEW; dispersion compensation; spectrum Interpolation。

目录

摘要I

AbstractII

绪论1

OCT概述1

OCT技术现状。2

1。2。1   OCT国内外研究现状。。。。。。2

OCT应用现状。。3

时域OCT和频域OCT对比5

2。1    时域OCT原理和系统结构5

2。2    频域OCT原理和数学模型。。。8

2。3   OCT系统部分参数11

2。3。1    灵敏度11

2。3。2    分辨率。。。11

2。3。3    成像深度与深度坐标12

第三章    频域OCT系统的构建 14

3。1   硬件系统14

  3。1。1  宽带光源。15

  3。1。2  光谱仪。。15

  3。1。3  参考臂。。16