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Exploring the Schlieren Method: History, Setups, and Applications

Discover the origins of the Schlieren method from Robert Hooke to August Toepler, how it works, and its optical applications. Learn about simple setups, optical principles, and references for further reading.

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Exploring the Schlieren Method: History, Setups, and Applications

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  1. 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.

  2. Schlieren Method: How It Works Simple Schlieren Setup • Produces image of an object • Deflection of light by refractive index gradient • Converging Lens • Knife Edge  Blocks unwanted light • Lens places image on screen

  3. 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

  4. 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

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