Extended volume and surface scatterometer for optical characterization of 3D-printed elements

Florian Dannenberg; Denise Uebeler; Jürgen Weiß; Lukas Pescoller; Cornelia Weyer; Cornelius Hahlweg

doi:10.1117/12.2189546

2 September 2015 Extended volume and surface scatterometer for optical characterization of 3D-printed elements

Florian Dannenberg, Denise Uebeler, Jürgen Weiß, Lukas Pescoller, Cornelia Weyer, Cornelius Hahlweg

Proceedings Volume 9573, Optomechanical Engineering 2015; 957307 (2015) https://doi.org/10.1117/12.2189546
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

The use of 3d printing technology seems to be a promising way for low cost prototyping, not only of mechanical, but also of optical components or systems. It is especially useful in applications where customized equipment repeatedly is subject to immediate destruction, as in experimental detonics and the like. Due to the nature of the 3D-printing process, there is a certain inner texture and therefore inhomogeneous optical behaviour to be taken into account, which also indicates mechanical anisotropy. Recent investigations are dedicated to quantification of optical properties of such printed bodies and derivation of corresponding optimization strategies for the printing process. Beside mounting, alignment and illumination means, also refractive and reflective elements are subject to investigation. The proposed measurement methods are based on an imaging nearfield scatterometer for combined volume and surface scatter measurements as proposed in previous papers. In continuation of last year’s paper on the use of near field imaging, which basically is a reflective shadowgraph method, for characterization of glossy surfaces like printed matter or laminated material, further developments are discussed. The device has been extended for observation of photoelasticity effects and therefore homogeneity of polarization behaviour. A refined experimental set-up is introduced. Variation of plane of focus and incident angle are used for separation of various the images of the layers of the surface under test, cross and parallel polarization techniques are applied. Practical examples from current research studies are included.

Citation Download Citation

Florian Dannenberg, Denise Uebeler, Jürgen Weiß, Lukas Pescoller, Cornelia Weyer, and Cornelius Hahlweg "Extended volume and surface scatterometer for optical characterization of 3D-printed elements", Proc. SPIE 9573, Optomechanical Engineering 2015, 957307 (2 September 2015); https://doi.org/10.1117/12.2189546

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KEYWORDS

Printing

Fused deposition modeling

Inspection

Translucency

Optical components

Luminescence

Near field

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