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- W2169820155 abstract "Telescopes with large aspherical primary mirrors collect more light and are therefore sought after by astronomers. Instead of large mirrors as a single piece, they can be made by use of numerous smaller segments. Because the segments must fit together to create the effect of a single mirror, segmented optics present unique challenges to fabrication and testing that are absent for monolithic optics. We have developed a new method for measuring large quantities of segments accurately, quickly, and economically using an interferometric test plate and computer-generated hologram (CGH). In this test, the aspheric mirror segments are interferometrically measured by use of a test plate with a best-fit spherical surface. The aspherical departure is accommodated with a small CGH that is imaged onto the test plates. The radius of curvature is tightly controlled by maintaining the gap between the test plate and the segment. We present a summary of the test and give the basic design tradeoffs for using a single system to measure all of the segments of a large aspheric mirror." @default.
- W2169820155 created "2016-06-24" @default.
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- W2169820155 date "2004-10-01" @default.
- W2169820155 modified "2023-09-23" @default.
- W2169820155 title "Efficient testing of segmented aspherical mirrors by use of reference plate and computer-generated holograms I Theory and system optimization" @default.
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- W2169820155 doi "https://doi.org/10.1364/ao.43.005303" @default.
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