1 December 1985 Application Of Pulsed Reflection Holography To Material Testing
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Optical Engineering, 24(6), 241086 (1985). doi:10.1117/12.7973634
Abstract
When holography is applied outside the laboratory, some well-known problems are encountered: vibrations, rigid-body motion, and stray daylight. Pulsed holography can overcome the difficulties with vibrations, but the other problems are less easily solved. When the object area to be holographically tested is small, a very simple and conve-nient method may be employed, which was described independently by Boone (1974) and Neumann and Penn (1975). They fixed the hologram holder rigidly to the object under test, thus avoiding rigid-body motion of the object with respect to the hologram. In a similar configuration Denisyuk reflection holograms are made without any necessity of darkening the environment. The authors believe that the main reason this technique is not widely used is due to difficulties generally encountered in processing the Denisyuk hologram to good quality. This paper describes a simple processing technique that results in high quality reflection holograms that may be analyzed by microscope up to interference fringe densities of about 30 fringes/mm. As examples, the results of a projectile impact study and the study of early fatigue crack detection in a critical airplane structure are presented.
R. L. van Renesse, J. W. Burgmeijer, "Application Of Pulsed Reflection Holography To Material Testing," Optical Engineering 24(6), 241086 (1 December 1985). https://doi.org/10.1117/12.7973634
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KEYWORDS
Holography

Holograms

Fringe analysis

Microscopes

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