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Proceedings Paper

Aeroacoustic characterization of turbulent free jets using scanning laser Doppler vibrometry
Author(s): Paolo Castellini; Milena Martarelli
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Paper Abstract

In this work a procedure for the aero-acoustic characterization of air jets was presented. The ability of a laser vibrometer to assess the changes in the optical path induced by local fluctuation of air refraction index was used to calculate the pressure oscillations produced by turbulence. The signal from the laser must be treated in order to extract the required information. From the pseudo velocity, which represents the integral of the refraction index distribution along the laser beam, it is possible to calculate, by a tomographic algorithm, the volumetric distribution of the refraction index at each frequency, and then the pressure oscillation. Each pressure voxel represents a sound source, i.e. monopole, that gives contribution to the Sound Pressure Level in each point of the surrounding. The uncertainty of the procedure was also evaluated.

Paper Details

Date Published: 22 June 2004
PDF: 10 pages
Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); doi: 10.1117/12.579757
Show Author Affiliations
Paolo Castellini, Univ. Politecnica delle Marche (Italy)
Milena Martarelli, Univ. Politecnica delle Marche (Italy)


Published in SPIE Proceedings Vol. 5503:
Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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