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Numerical simulation of speckle noise in laser vibrometry

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journal contribution
posted on 01.05.2008 by Steve Rothberg
This paper considers the fundamental mechanism by which speckle noise is generated in Laser Vibrometry before describing a new numerical simulation for prediction of speckle noise level in a real measurement. Factors within the simulation include rate of change of phase within individual speckle transitions, low pass filtering to match the frequency range of experimental data with which comparison is to be made, a track-and-hold facility for periods of low signal amplitude and wavefront curvature effects. The simulation data provides real insight into the phase and amplitude modulation of the Doppler signal and good agreement is found in the final comparison with experimental data from a measurement on a rotating target.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

ROTHBERG, S., 2006. Numerical simulation of speckle noise in laser vibrometry. Applied Optics, 45 (19), pp. 4523-4533.

Publisher

© Optical Society of America

Publication date

2006

Notes

This paper was published in the journal, Applied Optics, and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=ao-45-19-4523 Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

ISSN

0003-6935

Language

en

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