Approach for applying holographic interferometry to cases of strong gradients of index of refraction in a fluid using large modifications

Walter Schumann

doi:10.1117/12.140439

2 March 1993 Approach for applying holographic interferometry to cases of strong gradients of index of refraction in a fluid using large modifications

Walter Schumann

Author Affiliations +

Proceedings Volume 1732, Holographics International '92; (1993) https://doi.org/10.1117/12.140439
Event: Holographics International '92, 1992, London, United Kingdom

Abstract

The use of holographic interferometry to determine large deformations of opaque bodies by compensating modifications when reconstructing has been treated previously in several publications. The present contribution concerns a similar investigation in the case of a domain with a strong spatial change of the index of refraction as for instance in a gas with a high temperature gradient. Firstly, the general theory about the analogy between both fields as well as the image aberration and the fringe modification is outlined. Secondly, a development of the fringe vector in the case of a moderate index gradient is performed, leading to an approach for measuring the integral of the lateral gradient of the index along the curved ray.

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Walter Schumann "Approach for applying holographic interferometry to cases of strong gradients of index of refraction in a fluid using large modifications", Proc. SPIE 1732, Holographics International '92, (2 March 1993); https://doi.org/10.1117/12.140439

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