Chinese Optics Letters, 2009, 7 (11): 1007, Published Online: Nov. 11, 2009
Performance of dispersed Rayleigh interferometer on the active cophasing and alignment testbed Download: 574次
拼接镜面 共相位 色散瑞利干涉仪 共相位检测与控制平台 120.3180 Interferometry 120.1088 Adaptive interferometry 120.2830 Height measurements 120.6085 Space instrumentation
Abstract
We report the laboratory experiment on a segmented mirror testbed that shows the use of a dispersed Rayleigh interferometer to phase segmented mirrors. Segment alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the three individual segments on the focal plane. A spherical interferometer is introduced to evaluate the performance of piston, tip-tilt sensing, and control closed-loop, and finally a total residual root-mean-square (RMS) surface error of about 45 nm is achieved, in which a typical error of about 20 nm is contributed by piston. These results demonstrate that the dispersed Rayleigh interferometer can successfully sense the piston of segmented mirrors and be used in phasing segmented telescopes under extensive studies.
Shanshan Wang, Qiudong Zhu, Weirui Zhao, Lin Li, Genrui Cao. Performance of dispersed Rayleigh interferometer on the active cophasing and alignment testbed[J]. Chinese Optics Letters, 2009, 7(11): 1007.