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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 16 — Aug. 9, 2004
  • pp: 3719–3736

Ronchi test can detect piston by means of the defocusing term

J. Salinas-Luna, E. Luna, L. Salas, I. Cruz-González, and A. Cornejo-Rodríguez  »View Author Affiliations

Optics Express, Vol. 12, Issue 16, pp. 3719-3736 (2004)

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We present simulated results on piston detection applying the classical Ronchi test to a segmented surface. We have found that a piston error in a test segment, induces a change in the transversal aberration, that can be analyzed by mutually comparing the fringes frequency in each segment. We propose that the piston term of the segmented surface can be recovered by geometrically relating the change in transversal aberration with the piston term. To test this, we have simulated some ronchigrams for a known piston error, and we have been able to recover this term for a dynamic range comprised among 57nm and 550 µm. For piston errors >550µm a change in the transversal aberration can be appreciated and measured in the ronchigrams although these large pistons are now classical defocusings. Thus we have demonstrated that the Ronchi test can be an alternative method for the piston detection with a large dynamic range.

© 2004 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(220.1140) Optical design and fabrication : Alignment

ToC Category:
Research Papers

Original Manuscript: June 15, 2004
Revised Manuscript: July 12, 2004
Published: August 9, 2004

J. Salinas-Luna, E. Luna, L. Salas, I. Cruz-González, and A. Cornejo-Rodríguez, "Ronchi test can detect piston by means of the defocusing term," Opt. Express 12, 3719-3736 (2004)

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