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In-situ calibration of laser/galvo scanning system using dimensional reference artefacts

Published

Author(s)

Ho Yeung, Brandon M. Lane, M A. Donmez, Shawn P. Moylan

Abstract

Laser powder bed fusion systems use a high-power laser, steered by two galvanometer (galvo) mirrors to scan a pattern on metal powder layers. Part geometric tolerances depend on the positioning accuracy of the laser/galvo system. This paper describes an in-situ calibration technique utilizing a camera coaxially aligned with the laser imaging a dimensional reference artefact. The laser positions are determined from the images captured by the camera while scanning the artefact. The measurement uncertainty is estimated using simulations. The in-situ calibration results are compared with the results obtained from the typical 'burn and measure' galvo calibration method.
Citation
CIRP Annals-ManufacturingTechnology

Keywords

Selective laser melting (SLM), Positioning, Galvo Calibration

Citation

Yeung, H. , Lane, B. , Donmez, M. and Moylan, S. (2020), In-situ calibration of laser/galvo scanning system using dimensional reference artefacts, CIRP Annals-ManufacturingTechnology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929916 (Accessed July 7, 2022)
Created May 16, 2020, Updated October 7, 2020