Abstract
The theoretical and experimental foundations of holographic interferometry and holographic contouring are reviewed. Holography has revolutionized classical interferometric measurements. It visualizes optical path changes of the order of the wavelength of light, (i.e. 1/2 µm). It is a consequence of the wavefront (phase) re-creation properties of a hologram. A new technique of nondestructive testing has resulted. Flow visualization has been improved. It is practiced with visible lasers, usually He–Ne gas lasers or pulsed ruby lasers. The latter records holograms under non-laboratory conditions.
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