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Proceedings Paper

Fizeau interferometer for quasi parallel optical plate testing
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Paper Abstract

In this paper we present our proposal of processing three-beam interferograms obtained in a Fizeau interferometer when testing quasi-parallel optical plates. If the intensities of three interfering beams reflected from the front and back surfaces of the investigated plates and from the reference flat are nearly equal, the modulation distribution of the pattern encodes the information of the plate optical thickness variations, whereas the phase distribution contains the information about the sum of profiles of both surfaces (uniform refractive index distribution is assumed). Both maps can be derived using a combination of different interferogram analysis techniques such as Temporal or Spatial Carrier Phase Shifting and Vortex Transform. As a result separate information about both surfaces from a single measurement can be obtained. The situation complicates, however, when noticeable difference of the beam intensities occurs. We prove that in this case the modulation still contain useful information on the optical thickness of the investigated plate. Numerical studies of the method working principle are complemented by experimental results.

Paper Details

Date Published: 11 August 2008
PDF: 9 pages
Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630P (11 August 2008); doi: 10.1117/12.794488
Show Author Affiliations
Adam Styk, Warsaw Univ. of Technology (Poland)
Krzysztof Patorski, Warsaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 7063:
Interferometry XIV: Techniques and Analysis
Joanna Schmit; Katherine Creath; Catherine E. Towers, Editor(s)

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