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Proceedings Paper

The spatial frequency response and resolution limitations of pixelated mask spatial carrier based phase shifting interferometry
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Paper Abstract

The spatial frequency response of the pixelated phase mask sensor has been investigated both theoretically and experimentally. Using the small phase step approximation, it is shown that the instrument transfer function can be approximated as the product of the system optical transfer function and the spatial carrier processing filter transfer function. To achieve optimum performance it is important that the bandwidth of the optical imaging system is adequate so that the limiting factor is the detector pixel width. Actual measurements on a commercial Fizeau interferometer agree very well with the theory, and demonstrate detector limited performance. The spatial resolution of the calculated phase map is algorithm dependent; however, both the 2x2 and 3x3 convolution algorithms result in a frequency response that is significantly more than what would be obtained by a simple parsing of the image. Therefore, a 1k x 1k sensor has a spatial frequency response that is approximately equal to the detector limited resolution of a 700 x 700 array with its frequency response extending to the full Nyquist limit of the 1k x 1k array.

Paper Details

Date Published: 2 August 2010
PDF: 12 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77900K (2 August 2010); doi: 10.1117/12.860751
Show Author Affiliations
Brad Kimbrough, 4D Technology Corp. (United States)
James Millerd, 4D Technology Corp. (United States)

Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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