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Quasi-Static Position Calibration of the Galvanometer Scanner on the Additive Manufacturing Metrology Testbed

Published

Author(s)

Brandon M. Lane, Shawn P. Moylan, Ho Yeung, Josephine J. Chavez-Chao, Jorge E. Neira

Abstract

The Additive Manufacturing Metrology Testbed (AMMT) is a fully customized laser powder bed fusion (LPBF) additive manufacturing (AM) research platform designed and constructed at the National Institute of Standards and Technology. This system incorporates a galvanometer (galvo) scanner, consisting of two mirrors which can be controlled to rotate over fixed angles and reflect and position a focused, high power laser onto a substrate. This Technical Note describes the methods for calibrating the quasi-static position of the laser spot, positioned via the galvo, as a function of the digital command to the galvo controller. In addition, the procedures for calibrating the galvo position encoders to the physical laser spot position are provided. An example is provided of a measured galvo position errors before and after a calibration and compensation. Finally, an error reporting and uncertainty budget is provided
Citation
Technical Note (NIST TN) - 2099
Report Number
2099

Keywords

galvanometer, galvo calibration, laser powder bed fusion
Created June 17, 2020