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Proceedings Paper

Dynamic-speckle profilometer for online measurements of coating thickness
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Paper Abstract

We present a novel approach that enables online, real-time and non-contact measurements of thickness of protective coatings. The proposed technique based on spatial filtering of dynamic speckles generated by rapidly deflected laser beam. An advantageous feature of the technique is that it is capable for very fast measurement of coating thickness with accuracy of one micrometer while their roughness is 20 μm or higher. Such a high performance is achieved due to proper consideration of statistical properties of spatially filtered dynamic speckles. In this paper we report experimental study of correlation properties of photodiode responses in different configurations of optical setup. The results are in good agreement with theoretical estimations. Performance of a laboratory prototype of the proposed sensor is demonstrated in application to profile measurements of a tube coated by protective layers of different thickness.

Paper Details

Date Published: 5 June 2008
PDF: 12 pages
Proc. SPIE 7022, Advanced Laser Technologies 2007, 70220Q (5 June 2008); doi: 10.1117/12.803943
Show Author Affiliations
Alexei A. Kamshilin, Univ. of Kuopio (Finland)
Dmitry Semenov, Univ. of Kuopio (Finland)
Ervin Nippolainen, Univ. of Kuopio (Finland)
Serguei Miridonov, CICESE (Mexico)


Published in SPIE Proceedings Vol. 7022:
Advanced Laser Technologies 2007

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