MEASUREMENT OF THE DIAMETER VARIATION AND REFRACTIVE INDEX INHOMOGENEITY OF A FUSED SILICA SPHERE USING FOURSURFACE PHASE-SHIFTING INTERFEROMETRY

C.-S. Kang, U. Griesmann, J. A. Soons

Abstract

The diameter variation and refractive index inhomogeneity of a fused silica sphere were measured with a frequency-shifting Fizeau interferometer in a four-surface configuration. The phase-shifting algorithms to analyze the interference signals for each basic cavity were designed using the characteristic polynomial theory. We describe the experimental setup and preliminary results.

Keywords

phase-shifting interferometry, characteristic polynomial, sphere measurement, diameter variation, refractive index inhomogeneity

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IMEKO-WC-2012-TC14-O9.pdf

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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