High-speed digital in-line holography as multipoint vibrometry to analyze vibrations of structures

J. Poittevin; P. Picart; F. Gautier; C. Pezerat

doi:10.1117/12.2184459

22 June 2015 High-speed digital in-line holography as multipoint vibrometry to analyze vibrations of structures

J. Poittevin, P. Picart, F. Gautier, C. Pezerat

Proceedings Volume 9525, Optical Measurement Systems for Industrial Inspection IX; 95251X (2015) https://doi.org/10.1117/12.2184459
Event: SPIE Optical Metrology, 2015, Munich, Germany

Abstract

Structural vibrations can be measured with optical digital holography. Such a method provides measurements with a very high spatial resolution and is a nonintrusive technique. This method is based on the interference between a reference laser beam and the field diffracted by the studied object. Using a high speed camera, it can also be implemented in the time domain to investigate non-stationary problems.

In this paper, we present a recent investigation which shows that the high-speed digital holography is comparable with classical laser vibrometry. Furthermore, an experimental investigation of the vibratory field inside the Acoustic Black Hole is discussed. The principle of digital holography is explained and it is used here to provide a full field measurement of the velocity field at the extremity of the structure.

Citation Download Citation

J. Poittevin, P. Picart, F. Gautier, and C. Pezerat "High-speed digital in-line holography as multipoint vibrometry to analyze vibrations of structures", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 95251X (22 June 2015); https://doi.org/10.1117/12.2184459

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