Design of double cassegrain reflective mirrors for optical system of IR cameras

Rong Seng Chang, Sha Wei Wang, Pai Hung Chien

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


IR optical systems such as Petzval doublet refractive lenses or Cassegrain reflective mirrors are either expensive or poor in image quality. Taking advantage of the low cost of reflective mirrors, here we present an optical design of Double Cassegrain reflective mirrors consisting of two sets of Cassegrain reflectors facing each other symmetrically. This symmetry also cancels many aberrations besides the chromatic aberration-free nature of reflective mirrors. Design results show that this system is better than Cassegrain reflectors in aberration correction and image resolution, but cheaper than Petzval doublet refractive lenses systems in price. IR cameras with this optical system could be widely used for body temperature measurement and security check.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalOptical Review
Issue number2
StatePublished - Mar 2009


  • Cassegrain
  • Double Cassegrain
  • IR camera
  • Petzval doublet


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