Application Of Denisyuk Pulsed Holography To Material Testing

R. L. van Renesse; J. W. Burgmeijer

doi:10.1117/12.935367

26 October 1983 Application Of Denisyuk Pulsed Holography To Material Testing

R. L. van Renesse, J. W. Burgmeijer

Proceedings Volume 0398, Industrial Applications of Laser Technology; (1983) https://doi.org/10.1117/12.935367
Event: 1983 International Technical Conference/Europe, 1983, Geneva, Switzerland

Abstract

When holography is applied outside'the laboratory, some well known problems are experienced: vibrations, rigid body motion, 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 convenient method may be employed, which was earlier described by Neumann and Penn8; they fixed the hologram holder rigidly on 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 that this technique is not widely used, is due to difficulties generally encountered in processing the Denisyuk hologram to good quality. A simple processing technique is described resulting in high quality reflection holograms which may be analysed 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 aeroplane structure will be presented.

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R. L. van Renesse and J. W. Burgmeijer "Application Of Denisyuk Pulsed Holography To Material Testing", Proc. SPIE 0398, Industrial Applications of Laser Technology, (26 October 1983); https://doi.org/10.1117/12.935367

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