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Proceedings Paper

Holographic Interferometry With The Possibility Of Modifying The Fringes During Reconstruction
Author(s): W. Schumann; M. Dubas
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Paper Abstract

In holographic interferometry, fringe control may be achieved in several manners. In this paper, the general way of reasoning is applied to the case where the two interfering wavefronts are recorded on separate holograms, one of which is moved during the reconstruction. In the first part, we investigate the image reconstructed by a hologram displaced with regard to the recording. We determine especially the position of the aberrated image of a point source. In the second part we examine the fringes produced by the interference of the wavefront coming (virtually) from an undeformed object and the wave-front coming from the same object which has been mechanically deformed and moreover "optically modified" by the movement of the hologram. We first determine the optical path difference which does depend upon the mechanical displacement of the object point and upon the motion of the hologram, but not upon the position of the images. We then calculate the derivative of this path difference and express so the fringe interspace and direction. The derivative contains in addition to the previously mentioned displacement vectors, the strain and rotation tensors of the object and the rotation tensor of the hologram. In conclusion we show how such a modification of the position of a hologram may be useful for the deformation measurement.

Paper Details

Date Published: 18 April 1978
PDF: 7 pages
Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956155
Show Author Affiliations
W. Schumann, Swiss Federal Institute of Technology (Switzerland)
M. Dubas, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 0136:
1st European Conf on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

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