Artifact suppression and improved signal-to-noise ratio by phase-locked multiplexed coherent imaging

Artifact suppression and improved signal-to-noise ratio by phase-locked multiplexed coherent imaging

Laser additive manufacturing (AM) promises direct metal 3D printing, but is held back by defects and process instabilities, giving rise to a need for in situ process monitoring. Inline coherent imaging (ICI) has proven effective for in situ, direct measurements of vapor depression depth and shape in...

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Veröffentlicht in:Optics letters 2024-02, Vol.49 (3), p.738-741
Hauptverfasser: Giamberardino, Michael, Krause, Tessa J H, Fraser, James M
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Sprache:eng
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Laser beam welding
Multiplexing
Signal to noise ratio
Three dimensional printing
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container_title Optics letters
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creator Giamberardino, Michael
Krause, Tessa J H
Fraser, James M
description Laser additive manufacturing (AM) promises direct metal 3D printing, but is held back by defects and process instabilities, giving rise to a need for in situ process monitoring. Inline coherent imaging (ICI) has proven effective for in situ, direct measurements of vapor depression depth and shape in AM and laser welding but struggles to track turbulent interfaces due to poor coupling back into a single-mode fiber and the presence of artifacts. By z-domain multiplexing, we achieve phase-sensitive image consolidation, automatically attenuating autocorrelation artifacts and improving interface tracking rates by 58% in signal-starved applications.
doi_str_mv 10.1364/OL.503939
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source Optica Publishing Group Journals
subjects Laser beam welding
Multiplexing
Signal to noise ratio
Three dimensional printing
title Artifact suppression and improved signal-to-noise ratio by phase-locked multiplexed coherent imaging
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