2134/3314
Steve Rothberg
Steve
Rothberg
Numerical simulation of speckle noise in laser vibrometry
Loughborough University
2008
Vibration analysis
Speckle
Mechanical Engineering not elsewhere classified
Mechanical Engineering
2008-05-01 11:02:37
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Numerical_simulation_of_speckle_noise_in_laser_vibrometry/9570470
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.