11 August 2008 Strain distribution measurement by digital holographic interferometry using three spherical waves
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Abstract
In this paper, we proposed a calibration method with a reference plane to analyze strain distribution using three spherical waves in independent directions. The relationship between the phase difference and displacement for each pixel are determined for one beam using a reference plane. When this measurement is performed for each of three beams, the sensitivity matrix for each pixel can be obtained independently. We also proposed a phase analysis method using Fourier transform for a wave composed by three waves. Three spherical waves are irradiated onto the reference plane or an object simultaneously. The principle and the experimental results of strain measurement are shown.
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Motoharu Fujigaki, Motoharu Fujigaki, Kohhei Shiotani, Kohhei Shiotani, Ryosuke Kido, Ryosuke Kido, Yoshiharu Morimoto, Yoshiharu Morimoto, } "Strain distribution measurement by digital holographic interferometry using three spherical waves", Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630G (11 August 2008); doi: 10.1117/12.798316; https://doi.org/10.1117/12.798316
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