Abstract
Holographic interferometry is a method for recording and reconstructing three-dimensional images, which can be applied for the solution of strain analysis problems. Today this method, at least in its classical form, suffers from the way in which the interference fringes are recorded. Special photographic plates with high resolution are needed to record these images, together with accurate manipulation. This constraint has limited the industrial application of the method and oriented the research towards other optical interferometric methods that are less demanding in terms of equipments and experimental difficulties. Nevertheless, classic holographic interferometry offers an invaluable tool for the high accuracy and resolution required by very small displacements analysis. In the present book the classic method is presented in order to understand a special application to Fracture Mechanics for parameters identification in the case of interaction between two cracks.
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Notes
- 1.
Acronym for Light Amplification by Stimulated Emission of Radiation.
- 2.
For a correct exposure of the recording plate in darkened room, the average intensity of both beams must be similar.
- 3.
Today these special silver halide holographic plates are not easy to find for the end-production by some Companies. The holographic techniques aimed at creating media for holographic data recording are sometime announced by companies in the electronics industry such as Optware, Fujifilm, CMC Magnetics.
- 4.
Of course any rigid movement and rotation is equally recorded and overlapped to the displacements due to the loads.
- 5.
The direction cosines of a vector are the cosines of the angles between the vector and the three coordinate axes.
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Freddi, A., Olmi, G., Cristofolini, L. (2015). Introduction to Holographic Interferometry. In: Experimental Stress Analysis for Materials and Structures. Springer Series in Solid and Structural Mechanics, vol 4. Springer, Cham. https://doi.org/10.1007/978-3-319-06086-6_4
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DOI: https://doi.org/10.1007/978-3-319-06086-6_4
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