Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Performance Characterization of Process Monitoring Sensors on the NIST Additive Manufacturing Metrology Testbed



Brandon M. Lane, Steven E. Grantham, Ho Yeung, Clarence J. Zarobila, Jason C. Fox


Researchers and equipment manufacturers are developing in-situ process monitoring techniques with the goal of qualifying additive manufacturing (AM) parts during a build, thereby accelerating the certification process. Co-axial melt pool monitoring (MPM) is one of the primary in-situ process monitoring methods implemented on laser powder bed fusion (LPBF) machines. A co-axial MPM system is incorporated on the Additive Manufacturing Metrology Testbed (AMMT) at NIST; a multi-use custom LPBF research platform where one of many research goals is to advance measurement science of AM process monitoring. This paper presents the methods used to calibrate and characterize the spatial resolution of the melt pool monitoring instrumentation on the AMMT. Results from the measurements are compared to real melt pool images, and analysis is provided comparing the effect on spatial resolution limits on image analysis.
Proceedings Title
Proceedings of the Solid Freeform Fabrication Symposium
Conference Dates
August 7-9, 2017
Conference Location
Austin, TX
Conference Title
Solid Freeform Fabrication Symposium


additive manufacturing, process monitoring, modulation transfer function, melt pool
Created August 9, 2017, Updated October 30, 2017