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Proceedings Paper

Extended range interferometry based on wavefront shaping
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Paper Abstract

There are many cases when absolute measurements of objects with large height differences or height discontinuity is needed. These measurements can not be covered by classical interferometry since the range of non-ambiguity is limited to half the optical wavelength. Several techniques have been already developed for extending of non-ambiguity range. However most of them is based on multi-wavelength methods which demands expensive light sources and special environment conditions. In this work the new interferometric technique for absolute measurements of large steps discontinuities is proposed. Variable wavefront of the illuminating beam and special procedure for calibration of the measurement volume are used for extending of the measurement range without using multispectral sources. Additionally, calibration of the measurement area simplifies fringe processing and quicken measures. Theoretical analysis of this technique, its numerical simulations and experimental verification are presented and discussed.

Paper Details

Date Published: 14 September 2007
PDF: 9 pages
Proc. SPIE 6671, Optical Manufacturing and Testing VII, 66711G (14 September 2007); doi: 10.1117/12.735711
Show Author Affiliations
M. L. Szczupak, Warsaw Univ. of Technology (Poland)
L. Salbut, Warsaw Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 6671:
Optical Manufacturing and Testing VII
James H. Burge; Oliver W. Faehnle; Ray Williamson, Editor(s)

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