Simulations study of segmented mirror coarse phasing using two-dimensional dispersion fringe sensing technology

Mengxu Li; Ling Li; Yun Wang; Zhibo Liao

doi:10.1117/12.2524548

10 May 2019 Simulations study of segmented mirror coarse phasing using two-dimensional dispersion fringe sensing technology

Mengxu Li, Ling Li, Yun Wang, Zhibo Liao

Author Affiliations +

Proceedings Volume 11068, Second Symposium on Novel Technology of X-Ray Imaging; 110681J (2019) https://doi.org/10.1117/12.2524548
Event: Second Symposium on Novel Technology of X-Ray Imaging, 2018, Hefei, China

Abstract

Two-Dimensional Dispersion Fringe Sensing (TDDFS) is an efficient method for coarse phasing of segmented mirrors. Modeling and simulations based on double-aperture diffraction are used to study dispersion fringe in two directions. In the dispersion direction, the nonlinear least squares fitting method is used to extract the piston error. The theoretical capture range is ±96μm which is verified compared with the simulation results, and the detection accuracy can be reached to λ/10. However, the nonlinear least squares fitting method cannot effectively detect piston errors within one wavelength. In the diffraction direction, the principal maximum extraction method is used to measure the piston error, which is suitable for the piston error detection with a small range within one wavelength. In order to reduce the influence of the extraction error of the center line, we propose a corrective method. The results show that the accuracy of the modified principal maximum extraction method can reach 30nm. The two methods can effectively meet the requirements of the piston detection of the large-aperture segmented mirror telescopes.

Citation Download Citation

Mengxu Li, Ling Li, Yun Wang, and Zhibo Liao "Simulations study of segmented mirror coarse phasing using two-dimensional dispersion fringe sensing technology", Proc. SPIE 11068, Second Symposium on Novel Technology of X-Ray Imaging, 110681J (10 May 2019); https://doi.org/10.1117/12.2524548

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