A benchmark construction method for large aperture circular segmented optical systems
To realize integration detection and construct stability maintaining benchmark for large apertures of segmented telescopes,we propose a benchmark construction method.In this study,we use local pupil pro-jection to perform pupil alignment mapping.In addition,we construct a system confocal spatial benchmark using a microlens array.On the basis of annular whole-body control mode,a joint analysis method of con-focal and curvature radius enables joint adjustment of the curvature radius and system alignment.Finally,the stripe envelope formed by white light interference is used for coarse common phases detection,and the chan-nel spectral method is used to obtain precise connection between coarse and fine common phases.Addition-ally,the spatial confocal reference positioning exhibits an accuracy of less than 125 μm,and the common phase reference has a coverage range better than 0.5 μm within a 20-μm-range.Furthermore,the uncertainty of the spectral reference is less than 5%.We have effectively improved the accuracy of optical system in-situ measurement by achieving hierarchical and multimodal suppression of disturbances from different spatiotem-poral features.We have shortened the length of the traceability chain and increased the efficiency and accur-acy of detection by utilizing the new method of common reference in-situ measurement.
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