Survey of excitation signals with respect to scanning vibrometer measurements

Matthias Schuessler; Michael Woertge

doi:10.1117/12.307723

1 June 1998 Survey of excitation signals with respect to scanning vibrometer measurements

Matthias Schuessler, Michael Woertge

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307723
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

The quality of a vibration measurement depends strongly on the choice of the excitation signal. Common excitation signals were compared for measurements with a scanning vibrometer. It is shown that the best signal can be different as for measurements with accelerometers. While many points are acquired simultaneously with accelerometers, all points are measured sequentially with a scanning vibrometer. Therefore the measurement time is a more critical factor for the scanning vibrometer. As a further difference, a scanning vibrometer changes the position of the sensor without turning off the excitation. In this paper common excitation techniques are described. They show differences in signal-to-noise ratio, generation of leakage effects and measurement time. Not all of them are suitable for measuring non-linear structures. The described excitation signals are compared for typical scanning vibrometer applications.

Citation Download Citation

Matthias Schuessler and Michael Woertge "Survey of excitation signals with respect to scanning vibrometer measurements", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307723

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