Holography
The intent of this chapter is to present a self-contained text on fundamentals and representative applications of holography (concentrating on those of current interest). As such, the Chapter begins with an overview of basic concepts of holography, then m
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Holography 24. Holography
Ryszard J. Pryputniewicz
The intent of this chapter is to present a self-contained text on fundamentals and representative applications of holography (concentrating on those of current interest). As such, the Chapter begins with an overview of basic concepts of holography, then mathematical relationships and definitions sufficient to understand and apply these concepts are presented as, e.g., in optoelectronic holography (OEH) and in its implementation via optoelectronic laser interferometric microscope (OELIM) for studies of micro-electromechanical systems (MEMS) and microelectronics, both of which are, of great current interest. This is complemented by a description of systems for automated quantitative determination of displacements and deformations of objects. Finally, the description is illustrated with representative examples of applications in (experimental) micromechanics, concentrating on the emerging technologies addressing state-of-the-art developments in MEMS.
24.2 Fundamentals of Holography ................ 24.2.1 Recording of Holograms ................ 24.2.2 Reconstructing a Hologram............ 24.2.3 Properties of Holograms ................
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24.3 Techniques of Hologram Interferometry . 679 24.3.1 Optoelectronic Holography ............ 681 24.3.2 Quantitative Interpretation of Holograms ............................... 683 24.4 Representative Applications of Holography ...................................... 24.4.1 Determination of the Absolute Shape of Objects .... 24.4.2 Determination of Time-Dependent Thermomechanical Deformation Due to Operational Loads .............. 24.4.3 Determination of the Operational Characteristics of MEMS .................
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24.5 Conclusions and Future Work................. 695 References .................................................. 696
Since its invention, the field of (optical) holography has grown tremendously and found numerous uses in such diverse applications as aerospace, automotive, electronics, equipment, dental/orthodontics, machinery, medical, packaging, transportation, safety and security as well as frontiers of emerging technologies (ET). All these applications are well documented in countless publications too numerous even to be listed herein. And the field of holography is still growing. New ways are constantly being found to apply holography to solve problems that were previously unsolvable. So far, the author used holography in a very broad sense including also related fields of laser speckle and, in particular, holographic interferometry which is most important in experimental mechanics. Hence, holography will be used to refer to the broad field
Part C 24
The development of science and technology is based on discoveries which are often made because the time is right. Some discoveries have been made almost simultaneously by inventors who have worked independently of each other. This was not so with holography. Currently, credit for invention of holography is given to one man, Professo
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