Real-time modal analysis using a strong feedback self-mixing sensor

Joseph El Assad; Thierry Bosch; Guy Plantier

doi:10.1117/12.804121

5 June 2008 Real-time modal analysis using a strong feedback self-mixing sensor

Joseph El Assad, Thierry Bosch, Guy Plantier

Proceedings Volume 7022, Advanced Laser Technologies 2007; 70221I (2008) https://doi.org/10.1117/12.804121
Event: Advanced Laser Technologies 2007, 2007, Levi, Finland

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.

Citation Download Citation

Joseph El Assad, Thierry Bosch, and Guy Plantier "Real-time modal analysis using a strong feedback self-mixing sensor", Proc. SPIE 7022, Advanced Laser Technologies 2007, 70221I (5 June 2008); https://doi.org/10.1117/12.804121

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