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Proceedings Paper

Compact dynamic microfluidic iris array
Author(s): Christina Kimmle; Christoph Doering; Anna Steuer; Henning Fouckhardt
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Paper Abstract

A dynamic microfluidic iris is realized. Light attenuation is achieved by absorption of an opaque liquid (e.g. black ink). The adjustment of the iris diameter is achieved by fluid displacement via a transparent elastomer (silicone) half-sphere. This silicone calotte is hydraulically pressed against a polymethylmethacrylate (PMMA) substrate as the bottom window, such that the opaque liquid is squeezed away, this way opening the iris. With this approach a dynamic range of more than 60 dB can be achieved with response times in the ms to s regime. The design allows the realization of a single iris as well as an iris array. So far the master for the molded silicone structure was fabricated by precision mechanics. The aperture diameter was changed continuously from 0 to 8 mm for a single iris and 0 to 4 mm in case of a 3 x 3 iris array. Moreover, an iris array was combined with a PMMA lens array into a compact module, the distance of both arrays equaling the focal length of the lenses. This way e.g. spatial frequency filter arrays can be realized. The possibility to extend the iris array concept to an array with many elements is demonstrated. Such arrays could be applied e.g. in light-field cameras.

Paper Details

Date Published: 24 September 2011
PDF: 6 pages
Proc. SPIE 8125, Optomechanics 2011: Innovations and Solutions, 81250Z (24 September 2011); doi: 10.1117/12.892450
Show Author Affiliations
Christina Kimmle, Technische Univ. Kaiserslautern (Germany)
Christoph Doering, Technische Univ. Kaiserslautern (Germany)
Anna Steuer, Technische Univ. Kaiserslautern (Germany)
Henning Fouckhardt, Technische Univ. Kaiserslautern (Germany)


Published in SPIE Proceedings Vol. 8125:
Optomechanics 2011: Innovations and Solutions
Alson E. Hatheway, Editor(s)

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