Light Sheet Generation for DGV



 Light sheet generator
zum Bild Light sheet generator

 

The time-averaging Doppler global velocimeter obtains three distinct velocity components by illuminating observation plane from three different directions in succession. Although this arrangement requires three separate light sheet generators a single receiving camera is necessary to obtain three-component data.
A uniform intensity distribution across each light sheet is achieved through the use of scanning optics - in this case, a rotating slab of glass which exhibits a nearly linear beam translation with respect to its rotation. The small translation is then magnified through a set of cylindrical lenses.
The existing light sheet generators provide parallel sheets with a width of up to 130 mm, although divergent sheets can also be created. The typical beam oscillation frequency lies in the 10-50 Hz range.
 

 
 Light sheet generator interior.
zum Bild Light sheet generator interior.
 
 Complete laboratory setup.
zum Bild Complete laboratory setup.

 


Contact
Dr.rer.nat. Guido Stockhausen
German Aerospace Center

Institute of Propulsion Technology
, Triebwerksmesstechnik
Tel: +49 2203 601-3536

E-Mail: Guido.Stockhausen@dlr.de
Dr.phil. Christian Willert
German Aerospace Center

Institute of Propulsion Technology
, Triebwerksmesstechnik
Tel: +49 2203 601-2308

E-Mail: Chris.Willert@dlr.de
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