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Proceedings Paper

Shape measurements of microscopic objects using computational shear interferometry
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Paper Abstract

We present an efficient and less time consuming implementation of Computational Shear Interferometry (CoSI) by applying a smoothness on the assigned wave field. The method is used to recover the three dimensional form of a micro injection molded part from a set of shear measurements. For this purpose, six shear experiments have been recorded with the shears varying in orientation and magnitude. Varying the shears orientation and magnitude is applied using a setup consisting of a 4f filter with a reflective phase-only spatial light modulator (SLM) in the corresponding Fourier plane. The SLM is used as an electronic diffraction grating with a blazed structure. Based on the birefringent properties of the SLM two orthogonally polarized images, one diffracted and one reflected, appear on the camera sensor and produce shear interferograms. The shift between the images depends on the period and the orientation of the blazed grating. From shear interferograms, the phase of light diffracted by the object is reconstructed by CoSI. Thus the height map of the object is determined.

Paper Details

Date Published: 9 March 2016
PDF: 8 pages
Proc. SPIE 9718, Quantitative Phase Imaging II, 97182M (9 March 2016); doi: 10.1117/12.2212910
Show Author Affiliations
Mostafa Agour, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Aswan Univ. (Egypt)
Claas Falldorf, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Ralf B. Bergmann, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Univ. of Bremen (Germany)

Published in SPIE Proceedings Vol. 9718:
Quantitative Phase Imaging II
Gabriel Popescu; YongKeun Park, Editor(s)

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