Digital holography

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Digital holography refers to the science and the process of acquiring three-dimensional signals that enable the high-definition measurement of the surface dimensions of an object or an assembly of objects, and in which multi-wavelength optical imaging interferometry is employed to allow the surface shape to be measured over a range of distances significantly exceeding the wavelength of the laser light that is illuminating the surface. The digital holography process entails capturing multiple interferograms that each indicate the optical phase relationships beteen light returned from all sampled points on the illuminated surface and a controlled reference beam of light. From a set of these interferograms, holograms are computed that contain information defining the shape of the surface. Multiple holograms gathered at multiple laser light wavelengths are then combined to compile the full shape of the illuminated object over its full dimensional extent.

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