Abstract

The Ronchi test with a LCD amplitude sinusoidal grating is used for testing nominally flat surfaces. We prove that it is possible to measure flat surfaces without using a reference element by modifying the common optical Ronchi set up. The Ronchi rulings are computer generated and displayed on the LCD. By displaying various phase-shifted rulings and capturing the corresponding images, the phase is obtained with the conventional phase-shifting algorithms. Theoretical and experimental results are shown.

© 2003 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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Appl. Opt. (2)

J. Opt. Soc. Am. (1)

Opt. Commun. (1)

M. Mora González and N. Alcalá Ochoa, �??The Ronchi test with an LCD grating,�?? Opt. Commun. 191, 203-207 (2001).
[CrossRef]

Opt. Eng. (4)

M. Mora-González and N. Alcalá Ochoa, �??Sinusoidal liquid crystal display grating in the Ronchi test,�?? Opt. Eng. 42, 1725-1729 (2003).
[CrossRef]

P. Hariharan, �??Improved Oblique-Incidence Interferometer,�?? Opt. Eng. 14, 257-258 (1974).

M.V.R.K. Murty, R.P. Shukla, �??An Oblique Incidence Interferometer,�?? Opt. Eng. 15, 461-463 (1976).

D. Boebel, B. Packro�?, H.J. Tiziani, �??Phase shifting in an oblique incidence interferometer,�?? Opt. Eng. 30, 1910-1914 (1991).
[CrossRef]

Optical Shop Testing (1)

J. E. Greivenkamp, J. H. Bruning, �??Phase Shifting Interferometry,�?? Chapter 14 in Optical Shop Testing, D. Malacara, Ed., pp. 548-551, Wiley, New York, (1992).

Optik (1)

H. Nürge, J. Schwider, �??Testing of cylindrical lenses by grazing incidence interferometry,�?? Optik 111, 545-555 (2000).

Radio Science (1)

R.M. Goldstein, H.A. Zebker, and C.L. Werner, �??Satellite radar interferometry: two-dimensional phase unwrapping,�?? Radio Science, 23, 713-720 (1988).

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