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16 November 1999 Digital light-in-flight holography for simultaneous shape and deformation measurements
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An electronic method is proposed that can simultaneously measure an objects shape and its displacements in the micrometer range as well as in the millimeter range. This opens up the possibility to easily integrate holographic deformation measurements with FEA-modeling. It also makes it possible to record a 3D-movie. The method is a combination of digital holography and light-in-flight recording by holography. A Twyman-Green type interferometer is used with the reference mirror replaced by a Littrow-mounted reflection grating. The grating creates an optical delay across the beam profile. The deformations are projected to the 3D-shape whose gradients are determined by Sobel- operators. Large rigid body displacements are calculated by crosscorrelation of shapes measured before and after displacement. A short theoretical description is followed by experimental results of this method.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bengt J.L. Nilsson and Torgny E. Carlsson "Digital light-in-flight holography for simultaneous shape and deformation measurements", Proc. SPIE 3835, Three-Dimensional Imaging, Optical Metrology, and Inspection V, (16 November 1999);

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