4. Electronic speckle interferometry or TV-holography
4.1 Principle
Here again, the commercial term TV-holography has become commonplace. Anglo-Saxons still sometimes use the term ESPI (Electronic Speckle Pattern Interferometry).
This is in fact a modified Michelson interferometer, in which one of the mirrors is replaced by the object to be studied. As in the previous case, the photosensitive medium can be a CCD camera if you wish to quantify the results and/or work in real time (figure 12 ).
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Electronic speckle interferometry or TV-holography
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