Dynamic-speckle profilometer for online measurements of coating thickness

Alexei A. Kamshilin; Dmitry Semenov; Ervin Nippolainen; Serguei Miridonov

doi:10.1117/12.803943

5 June 2008 Dynamic-speckle profilometer for online measurements of coating thickness

Alexei A. Kamshilin, Dmitry Semenov, Ervin Nippolainen, Serguei Miridonov

Proceedings Volume 7022, Advanced Laser Technologies 2007; 70220Q (2008) https://doi.org/10.1117/12.803943
Event: Advanced Laser Technologies 2007, 2007, Levi, Finland

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.

Citation Download Citation

Alexei A. Kamshilin, Dmitry Semenov, Ervin Nippolainen, and Serguei Miridonov "Dynamic-speckle profilometer for online measurements of coating thickness", Proc. SPIE 7022, Advanced Laser Technologies 2007, 70220Q (5 June 2008); https://doi.org/10.1117/12.803943

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available