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Time Resolved Digital Holographic Interferometry for Investigations of Dynamical Events in Mechanical Components and Biological Tissues
Author(s) -
Pedrini G.,
Osten W.
Publication year - 2007
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2007.00341.x
Subject(s) - holography , holographic interferometry , digital holography , optics , deformation (meteorology) , electronic speckle pattern interferometry , ruby laser , vibration , interferometry , phase (matter) , fourier transform , laser , physics , materials science , acoustics , quantum mechanics , meteorology
In the first part (section 2) of the paper, a system based on digital holographic interferometry for the measurement of vibrations is presented. A high‐power continuous laser (10 W) and a high‐speed charge coupled device camera are used. Hundreds of holograms of an object that was subjected to dynamic deformation are recorded. The phase of the wave front is calculated from the recorded holograms by use of a two‐dimensional digital Fourier‐transform method. The deformation of the object is obtained from the phase. By combination of the deformations recorded at different time it is possible to reconstruct the vibration of the object. In the second part (section 3) of our paper, the holographic method is used for the measurements of the elastic properties of the bone. Samples of bone were loaded and deformed and a large number of interferograms (digital holograms) were recorded over a short period of time. In the third part (section 4) of the paper, we show how the holographic systems are adapted for performing measurements in hidden cavities.