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15 February 2024 Suppression of speckle noise in laser Doppler vibrometry by signal diversity and dynamic ellipse fitting
Zhan Huang, Bing Chen, Yu Fu
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Proceedings Volume 13069, International Conference on Optical and Photonic Engineering (icOPEN 2023); 130690V (2024) https://doi.org/10.1117/12.3022588
Event: International Conference on Optical and Photonic Engineering (icOPEN 2023), 2023, Singapore, Singapore
Abstract
The speckle effect caused by coherent light scattering from rough surfaces modulates the intensity and phase of the interference signal, which results in signal dropouts and phase noise for Laser-Doppler vibrometers (LDV), limiting the accuracy and resolution of LDV. Signal diversity has been demonstrated to significantly suppress the speckle noise in single-point LDV vibration measurements since two or more statistically independent reception channels significantly decrease the probability of speckle noise occurring. In this paper, an orthogonal interferometer based on polarization diversity is presented. We discuss the potential of suppressing the speckle noise with dynamic ellipse fitting and dual-channel data fusion. The displacement measurement of LDV is obtained by phase synchronization and a simple weighted sum method. The conclusion of this article is that signal diversity combined with a dynamic ellipse fitting algorithm is feasible to suppress speckle noise resulting from the periodic movement of the target.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Zhan Huang, Bing Chen, and Yu Fu "Suppression of speckle noise in laser Doppler vibrometry by signal diversity and dynamic ellipse fitting", Proc. SPIE 13069, International Conference on Optical and Photonic Engineering (icOPEN 2023), 130690V (15 February 2024); https://doi.org/10.1117/12.3022588
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KEYWORDS
Speckle
Laser Doppler velocimetry
Doppler effect
Interferometers
Demodulation
Vibration
Vibrometry
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