Abstract
This paper presents an uncertainty budget of measurement on the optical phase on the basis of a metrological analysis inspired from the GUM approach [GUM, Guide to the expression of Uncertainty in Measurement (ISBN 92-67-20188-9, 1993)]. This budget takes account of the procedure implemented in calibrating the phase-shifting device and in the actual phase measurement. This study leads to deriving an estimation of the standard uncertainty in measuring the optical path difference at approximately λ/98. This value agrees with a purely experimental estimate [F. Taillade, Association de la shearographie et des ondes de Lamb pour la detection rapide et quantitative des delaminages, Ph.D. thesis, Technical Note ONERA, NT 2001-3, 2001], which led to a standard uncertainty of roughly λ/108.
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