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用原有的多重切片系统(Multiple Section System)制成的全息图遇到障碍——曝光过度与图象模糊。当空间滤波技术被引入后,不仅克服了此困难,而且使相位物体三维象的重建成为可能。
Holograms made with the old Multiple Section System encountered obstacles - overexposure and blurred images. When the spatial filtering technique was introduced, not only the difficulty was overcome, but also the reconstruction of the three-dimensional image of the phase object was made possible.