Open AccessNonlinear signal errors in homodyne laser Doppler vibrometry induced by strong second-order ghost reflections and their mitigation
Author(s) -
Yanlu Li,
Roel Baets
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.418439
Subject(s) - optics , laser doppler vibrometer , homodyne detection , distortion (music) , direct conversion receiver , laser scanning vibrometry , physics , doppler effect , signal (programming language) , compensation (psychology) , nonlinear system , laser , laser doppler velocimetry , reflection (computer programming) , acoustics , computer science , laser beams , medicine , psychology , amplifier , blood flow , optoelectronics , cmos , quantum mechanics , astronomy , psychoanalysis , programming language
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.