Abstract
The out-of-plane displacement of a cantilever is measured by phase-shifting digital holography. From four phase-shifted holograms of a cantilever recorded by a CCD image sensor, a complex amplitude at each pixel of the CCD plane is obtained using the conventional phase-shifting method. The complex amplitude of a cantilever is reconstructed from the complex amplitude of the CCD plane using the Fresnel diffraction integral. The phase difference distribution on the cantilever before and after deformation, i.e., the out-of-plane displacement distribution, is calculated. In order to decrease the effect of speckle noise, a new method using divided holograms is proposed. The theory and experimental results are shown.
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This paper was presented, in part, at a symposium honoring Dr Christian P. Burger, Novel Applications of Experimental Methods in Mechanics, held at the 2003 SEM Annual Conference and Exposition of Experimental and Applied Mechanics, June 2–4, 2003, Charlotte, North Carolina.
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Morimoto, Y., Nomura, T., Fujigaki, M. et al. Deformation measurement by phase-shifting digital holography. Experimental Mechanics 45, 65–70 (2005). https://doi.org/10.1007/BF02428991
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DOI: https://doi.org/10.1007/BF02428991