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Open AccessArticle

A Non-Contact Measuring System for In-Situ Surface Characterization Based on Laser Confocal Microscopy

Advanced Remanufacturing and Technology Centre (Agency for Science, Technology and Research), Singapore 637143, Singapore
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 637798, Singapore
Design, Manufacture and Engineering Management Department, University of Strathclyde, Glasgow G11XQ, UK
Author to whom correspondence should be addressed.
Sensors 2018, 18(8), 2657;
Received: 20 June 2018 / Revised: 6 August 2018 / Accepted: 9 August 2018 / Published: 13 August 2018
(This article belongs to the Special Issue Laser Sensors for Displacement, Distance and Position)
The characterization of surface topographic features on a component is typically quantified using two-dimensional roughness descriptors which are captured by off-line desktop instruments. Ideally any measurement system should be integrated into the manufacturing process to provide in-situ measurement and real-time feedback. A non-contact in-situ surface topography measuring system is proposed in this paper. The proposed system utilizes a laser confocal sensor in both lateral and vertical scanning modes to measure the height of the target features. The roughness parameters are calculated in the developed data processing software according to ISO 4287. To reduce the inherent disadvantage of confocal microscopy, e.g., scattering noise at steep angles and background noise from specular reflection from the optical elements, the developed system has been calibrated and a linear correction factor has been applied in this study. A particular challenge identified for this work is the in-situ measurement of features generated by a robotized surface finishing system. The proposed system was integrated onto a robotic arm with the measuring distance and angle adjusted during measurement based on a CAD model of the component in question. Experimental data confirms the capability of this system to measure the surface roughness within the Ra range of 0.2–7 μm (bandwidth λcs of 300), with a relative accuracy of 5%. View Full-Text
Keywords: surface roughness; non-contact; in-situ measurement; error correction surface roughness; non-contact; in-situ measurement; error correction
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Fu, S.; Cheng, F.; Tjahjowidodo, T.; Zhou, Y.; Butler, D. A Non-Contact Measuring System for In-Situ Surface Characterization Based on Laser Confocal Microscopy. Sensors 2018, 18, 2657.

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