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Sensors 2017, 17(3), 596; doi:10.3390/s17030596

Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator

1
Institute for Measurement Systems and Sensor Technology, Technische Universität München, Theresienstrasse 90, 80333 Munich, Germany
2
ETSI Minas y Energía, Universidad Politécnica de Madrid, Rios Rosas 21, 28003 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 24 January 2017 / Revised: 7 March 2017 / Accepted: 10 March 2017 / Published: 15 March 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4328 KB, uploaded 17 March 2017]   |  

Abstract

The surface structure, especially the roughness, has a significant influence on numerous parameters, such as friction and wear, and therefore estimates the quality of technical systems. In the last decades, a broad variety of surface roughness measurement methods were developed. A destructive measurement procedure or the lack of feasibility of online monitoring are the crucial drawbacks of most of these methods. This article proposes a new non-contact method for measuring the surface roughness that is straightforward to implement and easy to extend to online monitoring processes. The key element is a liquid-crystal-based spatial light modulator, integrated in an interferometric setup. By varying the imprinted phase of the modulator, a correlation between the imprinted phase and the fringe visibility of an interferogram is measured, and the surface roughness can be derived. This paper presents the theoretical approach of the method and first simulation and experimental results for a set of surface roughnesses. The experimental results are compared with values obtained by an atomic force microscope and a stylus profiler. View Full-Text
Keywords: roughness measurement; fringe visibility; non-contact method; spatial light modulator; liquid crystal device roughness measurement; fringe visibility; non-contact method; spatial light modulator; liquid crystal device
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Aulbach, L.; Salazar Bloise, F.; Lu, M.; Koch, A.W. Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator. Sensors 2017, 17, 596.

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