Measurement of three-dimensional deformations using digital holography with radial sensitivity

Applied Optics
Christian KohlerG Armando Albertazzi

Abstract

A measurement system based on digital holography for the simultaneous measurement of out-of-plane and radial in-plane displacement fields for the assessment of residual stress is presented. Two holograms are recorded at the same time with a single image taken by a digital camera, allowing the separate evaluation of in-plane and out-of-plane movement. An axis-symmetrical diffractive optical element is used for the illumination of the object, which causes radial sensitivity vectors. By the addition and, respectively, the subtraction, of the four phase maps calculated from two camera frames, the in-plane and out-of-plane deformation of an object can be calculated separately. The device presented is suitable for high-speed, high-resolution measurement of residual stress. In addition to the setup, first measurement results and a short comparison to a mature digital speckle pattern interferometry setup are shown.

Citations

Jul 21, 2011·Applied Optics·Gannavarpu RajshekharPramod Rastogi
Mar 10, 2018·Applied Optics·Jagadesh RamaiahGannavarpu Rajshekhar

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