Telescópio Argunov-Cassegrain

Caminho da luz em um telescópio Argunov-Cassegrain

O telescópio Argunov-Cassegrain é um projeto de telescópio catadióptrico introduzido pela primeira vez em 1972 por PP Argunov.[1][2] Todas as ópticas são esféricas, e o clássico espelho secundário Cassegrain é substituído por um grupo corretor secundário de subabertura composto por três elementos espaçados no ar, duas lentes e um espelho Mangin (o elemento mais distante do espelho primário).

Discussão

Os sistemas Argunov empregam apenas superfícies esféricas e evitam as dificuldades práticas de fazer e testar esferas . No entanto, esse benefício é marginal, pois é quase tão difícil fazer uma verdadeira esfera livre de zona com raio de curvatura preciso quanto fazer uma superfície asférica com precisão comparável. Além disso, como várias superfícies estão envolvidas, a criação de um projeto com boa correção de aberrações pode se tornar muito complicada.[3]

Referências

  1. ↑ Argunov, P.P. (1972). «Izokhromaticheskie sistemy teleskopov so sfericheskoi optikoi» [Isochromatic telescope designs with spherical optics]. Astronomicheskij Vestnik. 6 (1): 52–61 
  2. ↑ «Catadioptric telescopes». Consultado em 19 de fevereiro de 2018 
  3. ↑ Sacek, Vladimir. «Catadioptric telescopes». telescope-optics.net. Notes on amateur telescope optics 

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