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Proceedings Paper

Twyman Green interferometer with CGH for testing of cylindrical surfaces
Author(s): D. K. Sharma; Johannes Schwider
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Paper Abstract

Modifications of the basic Twyman Green Interferometer for the testing of the a cylindrical surface are described in this paper. A CGH cylindrical lens of f equals 45.0 mm is put in the test arm of the interferometer to serve as a null lens. Polarizing components are used to provide for adjustments of the intensities of the two beams. The resulting interferograms have a strong bright patch in the middle which does not allow the unwrapping of the phase. A modification of the CGH cylindrical element makes this patch to disappear making possible the application of phase shifting technique for measurement of these surfaces.

Paper Details

Date Published: 29 April 1999
PDF: 5 pages
Proc. SPIE 3729, Selected Papers from International Conference on Optics and Optoelectronics '98, (29 April 1999); doi: 10.1117/12.346815
Show Author Affiliations
D. K. Sharma, Indian Institute of Technology/Madras (India)
Johannes Schwider, Univ. Erlangen-Nuernberg (Germany)

Published in SPIE Proceedings Vol. 3729:
Selected Papers from International Conference on Optics and Optoelectronics '98
Kehar Singh; Om Prakash Nijhawan; Arun Kumar Gupta; A. K. Musla, Editor(s)

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