Abstract
Why do we call it Toepler’s technique? Recalling Chap. 1, although Toepler was not the strict originator of schlieren imaging, he made it what it is today. Here, Toepler’s schlieren technique distinguishes the basic (lens or mirror) schlieren system with slit-source and knife-edge from all the other adaptations that have arisen since his time.
They said ‘You have a blue guitar
You do not play things as they are.’
The man replied, ‘Things as they are
Are changed upon a blue guitar.”
Wallace Stevens, The Man with the Blue Guitar
‘Schlieren apparatus’ is a name just as suitable or unsuitable as the name ‘telescope,’ for as the latter is a scope to see distance, so is the former an apparatus to see Schlieren.
August Toepler [135]
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References
K stands for Kopf or Schlierenkopf, the schlieren head lens. Here we call it the objective (from telescopy) or the field lens, since its diameter defines the schlieren field-of-view.
Sir William Herschel (1738–1822), a great astronomer, tilted his parabolic telescope mirror off its axis in order to gain access to the image.
The use of % cutoff in Fig. 3.10 is not a complete index of schlieren sensitivity. From Eqn. 3.7 above, f2/a is the proper descriptor. Nevertheless, % cutoff is used for convenience so long as f2 and h are also given.
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© 2001 Springer-Verlag Berlin Heidelberg
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Settles, G.S. (2001). Toepler’s Schlieren Technique. In: Schlieren and Shadowgraph Techniques. Experimental Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56640-0_3
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DOI: https://doi.org/10.1007/978-3-642-56640-0_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-63034-7
Online ISBN: 978-3-642-56640-0
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