21 June 2006 High speed digital holographic interferometry
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Proceedings Volume 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 634506 (2006) https://doi.org/10.1117/12.693107
Event: Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2006, Ancona, Italy
Abstract
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 CCD camera (1 kHz) are used. Hundreds of holograms of an object that has been subjected to dynamic deformation are recorded. The acquisition speed and the time of exposure of the detector are controlled by the vibration frequency. Two methods for triggering the camera in order to acquire at a given phase of the vibration are presented. 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.
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G. Pedrini, G. Pedrini, M. E. Gusev, M. E. Gusev, W. Osten, W. Osten, } "High speed digital holographic interferometry", Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 634506 (21 June 2006); doi: 10.1117/12.693107; https://doi.org/10.1117/12.693107
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