Schlieren Method: Some History

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Presentation transcript:

Schlieren Method: Some History Robert Hooke Discovered “Schlieren Method”  1665 Used two candles and a convex lens Low quality instruments OK! August Toepler Used conventional Schlieren System Trying to find impurities in lenses More complicated system, better equipment Although Schlieren looks and sounds like a German name, it is not the name of a scientist. The Schlieren method originated in Schlieren, Switzerland, and it has become an adjective describing the method itself.

Schlieren Method: How It Works Produces image of an object Deflection of light by refractive index gradient Converging Lens Knife Edge  Blocks unwanted light Lens places image on screen Simple Schlieren Setup where f is the focal length of the lens, do is the distance from the object to the lens and di is the distance from the image of the object to the lens

Schlieren Optics Point source of light illuminates an object or image. Image is focused on a knife edge. When index of refraction of the medium surrounding the object or image changes Image focal point will be perturbed Diffracted rays will interfere Perturbed focal point

References http://en.wikipedia.org/wiki/Schlieren http://www.abb.com/global/ http://www.lav.ethz.ch/research/projects/actual_projects/Experimentals/EHCCI/index http://www.rit.edu/~andpph/photofile-b/usch Hect, Eugene and Alfred Zajac. Optics. 3rd ed. New York: Addison Wesley Publishing Company, 1997. C:\Documents and Settings\AdvancedLab-II\Optics\Newport-Optics\2004S-Newport-Burns-etal.ppt