Computer aided alignment using Zernike coefficients

Ho Soon Yang, Sung Hee Kim, Yun Woo Lee, Jae Bong Song, Hyug Gyo Rhee, Hoi Yoon Lee, Jae Hyeob Lee, In Won Lee, Sug Whan Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

23 Citations (Scopus)


The high performance optical system is generally not easy to align. Particularly, if there are off-axis optical components in the system, the alignment is a very serious problem. Many researchers have reported that using sensitivity of some Zemike coefficients is useful in alignment. However, this method has a weak point in that it generates an accurate result only when the misalignments of component are located within the range where the sensitivities of coefficients are linear to the amount of misalignment. We developed the new method which allows larger misalignment at the early stage of alignment. It is to minimize the merit function of Zernike coefficients rather than to use sensitivities of coefficients. In this paper, we analyzed the cons and pros of conventional alignment method and our own method and demonstrated the accuracy and flexibility of our method by aligning the diameter 900 mm Cassegrain type collimator. Even though there was more than 1 mm decenter error, we could align the secondary mirror to the nominal position with just two trials.

Original languageEnglish
Title of host publicationInterferometry XIII
Subtitle of host publicationApplications
Publication statusPublished - 2006
EventInterferometry XIII: Applications - San Diego CA, United States
Duration: 2007 Aug 162007 Aug 17

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherInterferometry XIII: Applications
Country/TerritoryUnited States
CitySan Diego CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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