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Adaptive optics (AO) has been proved as a powerful means for high resolution imaging of human retina. Because of the pixel number of charge-coupled device (CCD) camera, the field of view is limited to 1°. In order to have image of capillaries around vivo human fovea, we use mosaic method to obtain high resolution image in area of 6°×6°. Detailed structures of capillaries around fovea with resolution of 2.3 μm are clearly shown. Comparison shows that this method has a much higher resolution than current clinic retina imaging methods. 相似文献
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用数字干涉仪测量变形镜影响函数的实验研究 总被引:6,自引:0,他引:6
分析了变形反射镜面形影响函数的意义,鉴于自适应光学系统中波前探测大都以测量波前斜率为基础的特点,提出应研究斜率影响函数,并在此基础上构成波前复原矩阵。还介绍了用数字干涉仪测量变形镜影响函数的方法和结果,并对测量结果进行了分析,得到了影响函数的各种参数,例如:交连值,高斯指数,特征宽度等。并将干涉法测量斜率影响函数的结果与实际的哈特探测器的测试结果进行了比较。 相似文献
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A 37-element solar adaptive optics (AO) system was built and installed at the 26-cm solar fine structure telescope of Yunnan Astronomical Observatory. The AO system is composed of a fine tracking loop with a tip/tilt mirror and a correlation tracker, a high-order correction loop with a 37-element deformable mirror, a correlating Shack-Hartmann wavefront sensor based on the absolute difference algorithm, and a real time controller. The system was completed on Sep. 28, 2009 and was used to obtain AO-corrected high-resolution solar images. The contrast and resolution of the images are clearly improved after wavefront correction by AO. To the best of out knowledge, this system is the first solar AO system in China. 相似文献
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Hybrid Deconvolution of Adaptive Optics Retinal Images from Wavefront Sensing 总被引:1,自引:0,他引:1
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Adaptive optics can be used to compensate for the wave aberration of the human eyes to achieve high-resolution imaging in real time. However the correction & partial due to the limitation of hardware. We propose a kind of hybrid image post-processing method, which uses the blind deconvolution combined with the residual data in wavefront sensor to restore the partially adaptive optics corrected retinal image. This method is applied in the image restoration of the vivid human retinal images. The results show that it is effective to improve the retinal image quality. 相似文献
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用于活体人眼视网膜观察的自适应光学成像系统 总被引:16,自引:4,他引:16
利用自适应光学技术,研制了两套活体人眼视网膜高分辨力成像系统,在实时校正人眼波前误差的基础上,实现活体人眼视网膜细胞尺度的高分辨力成像。这两套系统分别采用19和37单元小型压电变形反射镜作为波前校正元件,哈特曼-夏克(Hartmann-Shack)波前传感器测量波前误差,用眼底反射的半导体激光作为波前探测的信标。在用计算机控制自适应光学系统实现人眼波前误差校正后,触发闪光灯照明视网膜,用CCD相机记录视网膜的高分辨力图像。校正后的残余波前误差的均方根值已分别小于1/6和1/10波长,相当于视网膜上成像分辨力分别为3.4μm和2.6μm,接近衍射极限。试验表明37单元系统的成像质量更好。 相似文献
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自适应光学的眼科学应用 总被引:1,自引:0,他引:1
简述了自适应光学的基本原理,结合实验室的工作,介绍了自适应光学技术在人眼成像及视觉研究领域的应用,总结了在人眼像差测量和眼底泛光照明成像方面的工作,详细报道了在自适应光学相干层析技术和自适应光学视觉仿真器这两方面进展,给出了最新的实验结果. 相似文献
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研究了人眼在近视力状态下自动调节产生的动态像差。采用哈特曼-夏克(Hartmann-Shack,H-S)原理研制了一套可诱导人眼屈光调节,并能测量不同调节状态下人眼像差的测量仪。诱导原理为用视标在人眼近距离范围内移动以诱发人眼屈光调节,哈特曼-夏克传感器同时进行像差的测量,可以获得人眼调节时的视觉信息。与干涉仪测量同一像差板进行相比,像差仪的测量精度均方根(RMS)值为λ/50,重复性为λ/500,具有较好的测量精度和重复性。在测量的10人19只眼中,最大的诱发调节幅度为8.6D,一般可诱发调节幅度为3~8D之间,占总人数的84%。 相似文献
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