Reducing measurement time for a laser Doppler vibrometer using a spatial regressive technique

Joris Vanherzeele; Steve Vanlanduit; Patrick Guillaume

doi:10.1117/12.693170

21 June 2006 Reducing measurement time for a laser Doppler vibrometer using a spatial regressive technique

Joris Vanherzeele, Steve Vanlanduit, Patrick Guillaume

Proceedings Volume 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 63450K (2006) https://doi.org/10.1117/12.693170
Event: Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2006, Ancona, Italy

Abstract

In the last decade the laser Doppler vibrometer (LDV) has become a widely spread instrument for measuring vibrations. It often offers accurate measurements with a high spatial resolution. However, the measurement time of the LDV and especially for the scanning LDV is long. Therefore reducing the measurement time is an attractive objective. A way to achieve this is to use a single sine excitation (on a resonance frequency). However this technique has two major drawbacks: the inability to provide accurate information on the damping and an operational deflection shape that can differ from the true mode shape. In this article a method will be introduced to reduce measurement time for scanning LDV measurements without these defaults. This is done by using a narrow band multisine excitation signal. Now for uncoupled normal modes the obtained time domain sequences for each scan point are in direct linear relation with each other. Therefore it is possible to estimate the full time domain sequence from the current scan point by using the previous scan point and a limited number of time samples from the current scan point, hence reducing the measurement time. This method is a key benefit for in-line quality control, which can have upwards of 1000 spatial measurement locations. The proposed technique will be validated on both simulations and experiments of varying complexity.

Citation Download Citation

Joris Vanherzeele, Steve Vanlanduit, and Patrick Guillaume "Reducing measurement time for a laser Doppler vibrometer using a spatial regressive technique", Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63450K (21 June 2006); https://doi.org/10.1117/12.693170

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KEYWORDS

Time metrology

Aluminum

Doppler effect

Laser Doppler velocimetry

Solids

Error analysis

Spatial resolution

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