Principles and applications
نویسنده
چکیده
In digital holography holograms are recorded by a CCD and image reconstruction is performed by a computer. It is free from tedious photographic processing and delivers three-dimensional distributions of both amplitude and phase quantitatively. Its main limitation that is caused by much lower resolution of CCDs than photographic materials has been substantially overcome by phase-shifting digital holography that reduces the spatial frequency of hologram by employing the inline setup and directly evaluates complex amplitude at the CCD plane to eliminate the conjugate and zero-th order images appearing in the off-axis setup which has been commonly used. In this chapter we first describe its basic principle of image formation. It is followed by applications to microscopy, color holography, and data compression for storage, transmission, and real-time display of holographic data. Then its applications to measurements of shape and deformation of diffusely reflecting surfaces are discussed in comparison with conventional holographic interferometry and electronic speckle pattern interferometry.
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