Phase map by fringe projection with dammann gratings: an application to measure small objects

A. Nava-Vega, J. Salinas-Luna, E. Luna, J. Manuel Nuñez

Abstract


The phase of a suitable object was obtained with a fringe projection experiment by using phase shifting with Dammann gratings. As the spacing of the Dammann gratings can be manipulated, it is possible to generate projected thin fringes to improve details of the borders of the object. These gratings have the property that their spacing is not constant, can be programmed, encoded and displayed with versatile performance using a monochromatic source light on a liquid crystal display LCD or by means of a DLP (Digital Light Projector) to develop fringe projection experiments easily and at low cost. As result we have found a high-contrast projection fringes, side and rotation displacements can be better adapted to measure an object. Some fringes images can be generated by fifth order Dammann gratings projected on objects $\leq 20$ cm of height.

Keywords


Diffraction; interference multiple; profiling; phase; spatial light modulator

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Revista Mexicana de Física

ISSN: 2683-2224 (on line), 0035-001X (print)

Bimonthly publication of Sociedad Mexicana de Física, A.C.
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