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考虑光源和探测器有一定大小，并引入光源的高斯分布函数，求出此接近实际的共焦扫描成像系统的光学传递函数(OTF)；运用计算机进行数值模拟并讨论光源针孔和探测针孔的大小对横向、纵向分辨率的影响.所得结果在不影响共焦扫描成像系统三维(3D)成像能力的基础上，可以有效地提高系统的信噪比.Taking into account the size effect of the source and the detector, we have calculated the Optical transfer function of a real system with Gaussian distribution of the source. Because of the Gaussian distribution source , the size of source and detector can be enlarged, and the signal-to-noise ratio will be increased.
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