By Ulf Schnars, Werner Jüptner
This publication offers a self-contained therapy of the rules and significant functions of electronic hologram recording and numerical reconstruction (Digital Holography). the 1st half offers with optical foundations and the idea of holography. the subsequent part describes tips to list holograms without delay with an digital sensor (CCD) and describes some of the reconstruction concepts. a distinct bankruptcy is distinctive to electronic holographic interferometry with functions in deformation and form dimension and refractive index selection. purposes in imaging and microscopy also are defined. the following half discusses certain thoughts reminiscent of electronic light-in-flight holography, holographic endoscopy, info encrypting and comparative holography. within the final bankruptcy comparable suggestions of speckle metrology are taken care of briefly.
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Additional resources for Digital Holography. Digital Hologram Recording, Numerical Reconstruction, and Related Techniques (U. Schnars, W.Jueptner, 2005)
By holes in the object surface. To avoid this and other difficulties several other, more sophisticated demodulation algorithm have been developed. 7 Holographic Interferometry 39 Finally it should be mentioned that the unwrapping procedure is always the same for all methods of metrology, which generate saw-tooth like images. This means the various unwrapping algorithm developed for HI and other methods can be used also for Digital Holographic Interferometry, because this technique also generates modulo 2S-images (see chapter 4).
This is in contrast to the case of optical hologram reconstruction, in which only the intensity is made visible. This interesting 42 3 Digital Holography property of Digital Holography is used in Digital Holographic Interferometry, see chapter 4. Reference wave CCD (a) Object d (b) d Real image d d Virtual image d Virtual image (c) Real image Fig. 1. 1 General Principles K y K' x [ 43 [' U U' z d d Object plane Hologram plane Image plane Fig. 2. 6 the real image could be distorted. According to Eq.
This mode of HI is used to determine temperature or concentration variations in fluid or gaseous media. A refractive index change in a transparent medium causes a change of the optical path length and thereby a phase variation between two light waves passing the medium before and after the change. 97) l1 where n0 is the refractive index of the medium under observation in its initial, unperturbed state and n(x,y,z) is the final refractive index distribution. The light passes the medium in z-direction and the integration is taken along the propagation direction.