Campus Units

Industrial and Manufacturing Systems Engineering, Mechanical Engineering

Document Type


Publication Version

Accepted Manuscript

Publication Date


Journal or Book Title

Journal of Manufacturing Processes



First Page


Last Page


Research Focus Area(s)

Advanced Manufacturing Research




Surface topography and surface finish are two significant factors for evaluating the quality of products in additive manufacturing (AM). AM parts are fabricated layer by layer, which is quite different from traditional formative or subtractive methods. Despite rapid progress in additive manufacturing and associated optical metrology for quality control and in-situ monitoring, limited research has been conducted to investigate the reliability of 3D surface measurement data. The surface topologies scanned by multiple optical systems demonstrated significant differences due to varying sampling mechanisms, resolutions, system noises, etc. The 3D datasets should be trustworthy in order to extract parameters for quality assurance or feedback control from 3D surface measurements. In this paper, we set up new standards to evaluate the reliability of 3D surface measurement data and analyze the variation in the topographical profile. In this study, two non-contact optical methods based on Focus Variation Microscopy (FVM) and Structured Light System (SLS) were adopted to measure the surface topography of the target components. The two optical metrology systems generated two entirely different point cloud datasets. Statistical methods were applied to test the difference between the data obtained from the two systems. By using data analytics approach for comparison, it was found that the surface roughness estimated from the point cloud data sets of FVM and SLS has no significant difference, though the point cloud data sets were completely different. This paper provides standard validation approach to evaluate the plausibility of metrology data from in-situ real-time surface analysis for process planning of AM.


This is a manuscript of an article published as Zhang, Xiao, Yi Zheng, Vignesh Suresh, Shaodong Wang, Qing Li, Beiwen Li, and Hantang Qin. "Correlation approach for quality assurance of additive manufactured parts based on optical metrology." Journal of Manufacturing Processes 53 (2020): 310-317. DOI: 10.1016/j.jmapro.2020.02.037. Posted with permission.

Copyright Owner

The Society of Manufacturing Engineers



File Format


Available for download on Tuesday, March 01, 2022

Published Version