Author Affiliations
Abstract
Department of Optoelectronic Engineering, Beijing Insititute of Technology, Beijing 100081, China
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.
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 Chinese Optics Letters
2009, 7(11): 1007