2. Speckle interferometry: measuring in-plane displacements
2.1 Principle
The object is illuminated symmetrically with parallel laser light (figure 6 ). A photographic lens L forms an image of the object on a photosensitive medium H (usually film or a photographic plate, or a CCD camera) .
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Speckle interferometry: measuring in-plane displacements
Side-splitting speckle interferometry or shearography
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