A snapshot distortion test using Moiré fringes

Erin Sabatke; Lee Dettmann; Anna Pierce; Derek Sabatke

doi:10.1117/12.736305

21 September 2007 A snapshot distortion test using Moire fringes

Erin Sabatke, Lee Dettmann, Anna Pierce, Derek Sabatke

Proceedings Volume 6676, Optical System Alignment and Tolerancing; 66760D (2007) https://doi.org/10.1117/12.736305
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

We developed a distortion measurement technique that works in snapshot mode. Distortion information across the full field of view can be captured in a single short exposure. To do this, a Ronchi ruling is placed in the object and image planes of the system under test. The undistorted ruling in the image plane interferes with the distorted image of the ruling, producing a Moire fringe pattern that can be analyzed in several ways. Phase shifting can be carried out by shifting the Ronchi ruling in object space. The technique is insensitive to vibration and turbulence. Measurements were routinely made with P-V noise levels of 1 μm on measured chief ray locations in 20 mm image planes (0.01%). Repeated measurements showed disagreements on the 6 μm level across a 20 mm image plane (0.03% repeatability).

Citation Download Citation

Erin Sabatke, Lee Dettmann, Anna Pierce, and Derek Sabatke "A snapshot distortion test using Moire fringes", Proc. SPIE 6676, Optical System Alignment and Tolerancing, 66760D (21 September 2007); https://doi.org/10.1117/12.736305

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