Simultaneous quantitative evaluation of in-plane and out-of-plane deformations by use of a multidirectional spatial carrier

摘要

An optical system for the parallel evaluation of in-plane and out-of-plane deformations is described. The object is illuminated from two different directions and imaged onto a CCD sensor. Each illumination interferes with its corresponding reference' beam. This produces two sensitivity vectors. The refer-ences have different directions in order to produce two-directional spatial carriers. Two separate inter-ferograms of an object under test in its undeformed and deformed states are recorded. The Fourier method is used for the quantitative evaluation. The measurements along different sensitivity vectors are separated in the Fourier domain. The phases of the two interferograms are obtained from the complex amplitudes, and the two-dimensional deformation is calculated from the phases. Two different arrangements (with and without a lens system) are presented together with some experimental results.#1997 Optical Society of America