Amendment in observation of cracklike defects in metal plates with new instrumentation by utilizing holographic interferometry as NDT method

Timo K. Hartikainen

doi:10.1117/12.140462

2 March 1993 Amendment in observation of cracklike defects in metal plates with new instrumentation by utilizing holographic interferometry as NDT method

Timo K. Hartikainen

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Proceedings Volume 1732, Holographics International '92; (1993) https://doi.org/10.1117/12.140462
Event: Holographics International '92, 1992, London, United Kingdom

Abstract

In holographic interferometry an object must be irritated in order to make material defects or displacements of the object visible. In solids an elastic wave is a reliable source of this irritation for holographic interferometry purposes. The nature of the elastic wave is quite essential when studying crack-like defects in metal plates. A high quality CO₂-pistol can establish an impact velocity of over 100 m/s and adequate stability in a long series of impacts can be generated by the pistol's bullet. In this paper a new instrumentation for external impact on the object in holographic interferometry is described. Interferograms are recorded by a double-pulsed ruby laser synchronized with the external impact. Some interferograms of a 10 mm thick iron plate are studied. In these interferograms the crack-like defects are clearly observable.

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Timo K. Hartikainen "Amendment in observation of cracklike defects in metal plates with new instrumentation by utilizing holographic interferometry as NDT method", Proc. SPIE 1732, Holographics International '92, (2 March 1993); https://doi.org/10.1117/12.140462

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KEYWORDS

Iron

Holographic interferometry

Metals

Firearms

Holography

Wave plates

Ruby lasers

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