Integration of differential wavefront sampling with merit function regression for efficient alignment of three-mirror anastigmat optical system

Eun Song Oh, Seonghui Kim, Yunjong Kim, Hanshin Lee, Sug Whan Kim, Ho Soon Yang

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

8 Citations (Scopus)

Abstract

We first studied the characteristics of alignment performances of two computer-aided alignment algorithms i.e. merit function regression (MFR) and differential wavefront sampling (DWS). The initial study shows i) that, utilizing damped least square algorithm, MFR offers accurate alignment estimation to the optical systems with non-linear wavefront sensitivity to changes in alignment parameters, but at the expense of neglecting the coupling effects among multiple optical components, and ii) that DWS can estimate the alignment state while taking the inter-element coupling effects into consideration, but at the expense of increased sensitivity to measurement error associated with experiment apparatus. Following the aforementioned study, we report a new improved alignment computation technique benefitted from modified MFR computation incorporating the concept of standard DWS method. The optical system used in this study is a three-mirror anastignmat (TMA) based optical design for the next generation geostationary ocean color instrument (GOCI-II). Using an aspheric primary mirror of 210 mm in diameter, the F/7.3 TMA design offers good imaging performance such as 80% in 4 um in GEE, MTF of 0.65 at 65.02 in Nyquist frequency. The optical system is designed to be packaged into a compact dimension of 0.25m × 0.55m × 1.050m. The trial simulation runs demonstrate that this integrated alignment method show much better alignment estimation accuracies than those of standard MFR and DWS methods, especially when in presence of measurement errors. The underlying concept, computational details and trial simulation results are presented together with implications to potential applications.

Original languageEnglish
Title of host publicationOptical System Alignment, Tolerancing, and Verification IV
DOIs
Publication statusPublished - 2010
EventOptical System Alignment, Tolerancing, and Verification IV - San Diego, CA, United States
Duration: 2010 Aug 12010 Aug 2

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7793
ISSN (Print)0277-786X

Other

OtherOptical System Alignment, Tolerancing, and Verification IV
CountryUnited States
CitySan Diego, CA
Period10/8/110/8/2

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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  • Cite this

    Oh, E. S., Kim, S., Kim, Y., Lee, H., Kim, S. W., & Yang, H. S. (2010). Integration of differential wavefront sampling with merit function regression for efficient alignment of three-mirror anastigmat optical system. In Optical System Alignment, Tolerancing, and Verification IV [77930F] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7793). https://doi.org/10.1117/12.860767