Preliminary study of a dispersed fringe type sensing system
Zhang Yong1; Liu GenRong1; Wang YueFei1; Li YePing1; Zhang YaJun1; Zhang Liang1
AbstractTelescopes with large aspherical primary mirrors collect more light and are therefore sought after by astronomers. Instead of using a single large one-piece mirror, smaller segments can be assembled into a useable telescopic primary. Because the segments must fit together to create the effect of a single mirror, segmented optics present unique challenges to the fabrication and testing that are absent in monolithic optics. A dispersed fringe sensor (DFS) using a broadband point source is an efficient method for cophasing and is also highly automated and robust. Unlike the widely adopted Shack-Hartmann Wavefront sensor and curvature wavefront sensor with edge sensors for calibration of relative pistons, DFS can estimate the piston between segments by only using the spectrum formed by the transmissive grating's dispersion, and therefore can replace the edge sensors, which are difficult to calibrate. We introduce the theory of the DFS and Dispersed Hartmann Sensor (DHS) for further utilization of the coarse phasing method of DFS. According to the theory, we bring out the preliminary system design of the cophasing experimental system based on DFS and DHS which is now established in our institute. Finally, a summary is reached.
KeywordMIRROR ACTIVE OPTICS SEGMENTED MIRRORS LAMOST TELESCOPE SENSOR instrumentation: active optics techniques: image processing techniques: spectroscopic telescope: cophasing sensor
Funding Project[National Natural Science Foundation of China]
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang Yong,Liu GenRong,Wang YueFei,et al. Preliminary study of a dispersed fringe type sensing system[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(8):945.
APA Zhang Yong,Liu GenRong,Wang YueFei,Li YePing,Zhang YaJun,&Zhang Liang.(2009).Preliminary study of a dispersed fringe type sensing system.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(8),945.
MLA Zhang Yong,et al."Preliminary study of a dispersed fringe type sensing system".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.8(2009):945.
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