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    • 18. 发明授权
    • Twin-image elimination apparatus and method
    • 双图像消除装置和方法
    • US5805316A
    • 1998-09-08
    • US705971
    • 1996-08-30
    • Kazunori ShinodaTing-Chung PoonMing Hsien WuYoshiji Suzuki
    • Kazunori ShinodaTing-Chung PoonMing Hsien WuYoshiji Suzuki
    • G03H1/10G03H1/00G03H1/22
    • G03H1/22G03H1/0443G03H2001/0088G03H2001/0463G03H2001/262G03H2225/20G03H2225/33G03H2225/60
    • The twin-image elimination apparatus of the present invention comprises (a) a scanning light source for emitting a scanning light beam; (b) an interference device which converts the scanning light beam from the scanning light source into a spherical wave and a plane wave having temporal frequencies different from each other and combines the spherical and plane waves together; (c) a scanner for scanning an object with the combined light beam from the interference device; (d) a photodetector for detecting a scattered wave from the object; (e) a first multiplier which converts an output signal of the photodetector into a cosine-coded holographic information; (f) a second multiplier which converts the output signal of the photodetector into a sine-coded holographic information; and (g) a holographic reconstruction device which converts output signals of the first and second multipliers into a sum signal, in which these output signals are added together with a phase difference of .pi./2+2n.pi. (wherein n is an integer not less than 0), so as to reproduce an image of the object without the presence of its twin image. Hence, at the time of reconstructing a hologram, the virtual image component contained in the output signal of the photodetector can be removed, thereby improving the image quality of the reconstructed image.
    • 本发明的双图像消除装置包括:(a)用于发射扫描光束的扫描光源; (b)将来自扫描光源的扫描光束转换为球面波的干涉装置和具有彼此不同的时间频率的平面波,并将球面和平面波组合在一起; (c)用来自干涉装置的组合光束扫描物体的扫描仪; (d)用于检测来自物体的散射波的光检测器; (e)将所述光电检测器的输出信号转换为余弦编码的全息信息的第一乘法器; (f)将光电检测器的输出信号转换为正弦编码的全息信息的第二乘法器; 和(g)将第一和第二乘法器的输出信号转换为和信号的全息重建装置,其中这些输出信号以pi / 2 + 2n pi的相位差加在一起(其中n是不小于整数的整数) 比0),以便在没有其双重图像的情况下再现对象的图像。 因此,在重建全息图时,可以去除包含在光电检测器的输出信号中的虚拟图像分量,从而提高重建图像的图像质量。