Nonlinear signal errors in homodyne laser Doppler vibrometry induced by strong second-order ghost reflections and their mitigation

A variety of mechanisms can induce distortions in the output signals of a homodyne laser Doppler vibrometer (LDV). In this paper, the nonlinear LDV distortions caused by a strong second-order ghost reflection originating from lens flares are theoretically explained and analyzed. We propose a simple compensation method to mitigate this distortion. The performance and limitations of this method are also explained both in simulation and in experiment. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

This paper discusses the mechanisms of distortion in the output signals of a homodyne laser Doppler vibrometer (LDV) and proposes a simple compensation method to mitigate the nonlinear LDV distortions caused by a strong second-order ghost reflection from lens flares. The performance and limitations of this method are also explained in simulation and in experiment.