HIGH RESOLUTION MEASUREMENTS OF OPTICAL TOMOGRAPHY IN SCATTERING MEDIUM

基于光学频率反射计的光学相干层析成像技术已经发展起来。该系统已应用于鸡组织后反射率的测量。主要结果如下。(1)可调谐激光光源的光频可以在2秒内线性扫描到10 THz，没有跳模效应。(2)采用CCD摄像机的数据处理系统，可以按时间顺序存储到512帧的存储器中，并对每个像素数据进行傅立叶变换。(3)该系统的深度分辨率为47妈妈的五分钟的短分析时间，通过使用快速傅立叶变换方法。(4)在迈克尔逊干涉仪中插入由双透镜构成的光学系统。通过使用该系统和光学外差系统，来自散射介质的强漫射光被拒绝到<-9>入射光强度的10^。(5)该系统可对强散射介质内从表面到几毫米深度的反射率分布进行三维测量。(6)用2秒的测量时间测量鸡组织后面的反射率。结果表明，该系统可用于三维反射率分布的测量。

Optical coherence tomography based on an optical frequency reflectometry has been developed. The system has been applied to measurements of reflectivity behind chiken tissue. The main results are shown as followings.(1) The optical frequency of tunable laser source can be linearly scanned upto 10 THz during 2 seconds without a mode-hoppe effect.(2) The data processing system with a CCD camera can be time-sequentially stored to memories of 512 frames, and be Fourier-transformed every pixel-data.(3) The depth resolution of this system is 47 mum for five minutes of short analyzing time by using the fast Fourier transform method.(4) The optical system which is constructed of two-lens system is inserted in the Micherlson interferometer. By using this system and an optical heterodyne system, the strong diffuse light from the scattering media was rejected to 10^<-9> of incident light intensity.(5) The system can measure three-dimensionally the reflectivity distribution inside strong scattering media from the surface to the depth of a few millimeters.(6) The reflectivity behind a chiken tissue was measured with measuring time of 2 seconds. From the results, the present system is available to three-dimensional reflectivity distribution measurements.