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Proceedings Paper

Wire diameter determination by interferometry and diffraction: the improvement of diffraction models in 3D objects
Author(s): Juan Carlos Martinez-Anton; Ibrahim Serroukh; Eusebio Bernabeu
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Paper Abstract

The laser diffraction is a robust and precise technique to monitor wire diameters in-line. However, classical Fraunhofer diffraction formulas are not appropriate for 3D object size determination. The Babinet's principle allow to use such formulas only for angles of diffraction that tend to zero. A real diffraction measurement necessarily takes a finite angular range (approximately 10 degree(s)) and therefore, an error will be introduced if using classical formulas. The exact electromagnetic formulation is not appropriate to deal with 3D objects in a simple way. On the other hand we observed a systematic overestimation of the diameter, even very small angle of observation, in other words, a small misfit with the Babinet's principle.

Paper Details

Date Published: 17 August 1999
PDF: 9 pages
Proc. SPIE 3745, Interferometry '99: Applications, (17 August 1999); doi: 10.1117/12.357787
Show Author Affiliations
Juan Carlos Martinez-Anton, Univ. Complutense de Madrid (Spain)
Ibrahim Serroukh, Univ. Complutense de Madrid (Spain)
Eusebio Bernabeu, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 3745:
Interferometry '99: Applications
Werner P. O. Jueptner; Krzysztof Patorski, Editor(s)

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