Precision aspheric optics testing with SCOTS: A deflectometry approach

Peng Su, Manal Khreishi, Run Huang, Tianquan Su, James H. Burge

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

28 Scopus citations


Absolute measurement with SCOTS/deflectometry is a calibration problem. We use a laser tracker to calibrate the test geometry. The performance id demonstrated with the initial measurement results from the Large Synoptic Survey Telescope tertiary mirror. Systematic errors from the camera are carefully controlled. Camera pupil imaging aberration is removed with an external aperture stop. Imaging aberration and other inherent errors are suppressed with a rotation test. Results show that the SCOTS can act as a large dynamic range, high precision, non-null test method for precision aspheric optics. The SCOTS test can achieve measurement accuracy comparable with the traditional interferometric testing.

Original languageEnglish (US)
Title of host publicationOptical Measurement Systems for Industrial Inspection VIII
StatePublished - 2013
EventOptical Measurement Systems for Industrial Inspection VIII - Munich, Germany
Duration: May 13 2013May 16 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOptical Measurement Systems for Industrial Inspection VIII


  • Aspherics
  • Deflectometry
  • Free-form surface
  • Fringe reflection
  • Hartmann test
  • Optical metrology
  • Optical testing

ASJC Scopus subject areas

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


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