A null test for null correctors: Error analysis

Jim Burge

Research output: Contribution to journalConference articlepeer-review

24 Scopus citations


An optical test has been devised to test and qualify null correctors that are used for measuring highly aspheric primary mirrors. The technique employs a rotationally symmetric computer-generated hologram (CGH) that tests the null corrector directly by synthesizing a wavefront that would be returned by a perfect primary mirror. A description of the test and summary of the error analysis are given. The error analysis includes hologram errors from pattern distortion, substrate flatness, and etch depth variations. It also includes the effects of errors in the wavelength and data analysis errors. This resulting analysis shows ±78 ppm accuracy for measuring the conic constant of null correctors built for measuring 3.5-m f/1.75 primary mirrors.

Original languageEnglish (US)
Pages (from-to)86-97
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 7 1993
EventQuality and Reliability for Optical Systems 1993 - San Diego, United States
Duration: Jul 11 1993Jul 16 1993

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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