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Proceedings Paper

Real-time modal analysis using a strong feedback self-mixing sensor
Author(s): Joseph El Assad; Thierry Bosch; Guy Plantier
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Paper Abstract

Modal analysis methods are relatively recent methods developed in order to exploit the dynamical models of real mechanical structures (such like airplanes) and to estimate their transfer functions. Self Mixing (SM) sensors were previously used in modal analysis applications using essentially a frequency sweeping of a sinusoidal signal requiring thereby very long time and complicated signal processing (Kalman filters, ...). The method used in this article consists of an excitation with a white noise requiring a sensor with an output that is a real image of the vibration itself in order to have a response for the whole frequency spectrum. This may be achieved with strong feedback SM sensors where it is demonstrated that with a sufficiently high coupling the Output Optical Power (OOP) of the laser follows exactly the displacement of the target. This method has the advantage of estimating the transfer function over the whole frequency spectrum with only the need of a FFT analyser and not any other signal processing.

Paper Details

Date Published: 5 June 2008
PDF: 9 pages
Proc. SPIE 7022, Advanced Laser Technologies 2007, 70221I (5 June 2008); doi: 10.1117/12.804121
Show Author Affiliations
Joseph El Assad, LOSE, ENSEEIHT, Univ. of Toulouse (France)
Thierry Bosch, LOSE, ENSEEIHT, Univ. of Toulouse (France)
Guy Plantier, GSII, ESEO (France)


Published in SPIE Proceedings Vol. 7022:
Advanced Laser Technologies 2007

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