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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 9 — Mar. 20, 2012
  • pp: 1276–1282

Three-dimensional shape measurement of large-aperture aspheric mirrors by off-axis null Ronchi test

Chunfeng Guo, Xianyu Su, Wenjing Chen, Baiping Lei, and Fan Wu  »View Author Affiliations


Applied Optics, Vol. 51, Issue 9, pp. 1276-1282 (2012)
http://dx.doi.org/10.1364/AO.51.001276


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Abstract

An off-axis null Ronchi test is presented to measure the three-dimensional (3D) shape of a large-aperture aspheric mirror. The method designs curved fringe patterns as null sinusoidal gratings by means of phase information and ray tracing. In the process of measurement, the curved fringe patterns are displayed on a transmission-type liquid crystal display (T-LCD) screen, and a CCD camera records the fringe patterns containing the information of deviations of the mirror. The slopes of the deviations of the mirror are obtained by using the recorded fringe patterns. The deviations are restored by integrating, and then the 3D shape of the mirror can be reconstructed. Compared with the classical null Ronchi test, the method can provide enough measured data points and avoid the jagged edges of bands on the null gratings. Moreover, the method can conveniently change period and direction of the curved fringes and accurately control phase shifting. Computer simulations and a preliminary experiment are presented to show the performance of the method.

© 2012 Optical Society of America

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(220.1250) Optical design and fabrication : Aspherics
(220.4840) Optical design and fabrication : Testing

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: November 1, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: January 13, 2012
Published: March 15, 2012

Citation
Chunfeng Guo, Xianyu Su, Wenjing Chen, Baiping Lei, and Fan Wu, "Three-dimensional shape measurement of large-aperture aspheric mirrors by off-axis null Ronchi test," Appl. Opt. 51, 1276-1282 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-9-1276


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References

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