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- W4362590147 abstract "Presently, the segmented mirror is the mainstream development direction of large-aperture telescopes. The key problem affecting the performance of segmented mirror telescopes concerns the co-phase of the segments. The segments’ co-phase includes the fine phasing stage with high detection accuracy requirements and a small measurable range, and the coarse phasing stage with relatively high detection accuracy requirements and a large measurable range. For interferometry, the required accuracy of the transition from the coarse phasing stage to the fine phasing stage is half of the measured wavelength (~300 nm). In this study, a piston measure method based on the wavefront data of the interference measurement results of multiple different wavelengths is proposed. The simulation results show that the method can achieve a measurement accuracy of more than 300 nm in a large range of 1 mm. The experimental results show that the method can achieve a more-than-300-μm measurable range and approximately 1.5 μm detection accuracy under laboratory conditions; this method has advantages in terms of the measured range and speed and is suitable for the coarse phasing stage." @default.
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- W4362590147 date "2023-04-01" @default.
- W4362590147 modified "2023-10-01" @default.
- W4362590147 title "Coarse Phasing Detection Using Multiwavelength Wavefront" @default.
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- W4362590147 doi "https://doi.org/10.3390/photonics10040388" @default.
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