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Optical Delay Line System for the NIAOT Prototype Stellar Interferometer
Wu Zhen; Zhu Yongtian; Chen Yi; Wang Jianing
2008-07-14
Source PublicationOptical and Infrared Interferometry
Volume7013
Issue7013
PagesVol.7013 2W-1-7
Conference Date2008-6-23
Conference PlaceMarseille, France
Funding OrganizationThe International Society for Optical Engineering
PublisherSPIE
Abstract
An optical delay line system for NIAOT Prototype long baseline stellar optical interferometer is being developed. The delay line system consists of optics part, machine part and control part. The optics part is a cat’s-eye system which includes a paraboloidal mirror and a flat mirror. The flat mirror is placed at the focus, and is driven by a piezoelectric actuator for real-time compensation of the tracking error. The defocus of the
flat mirror caused by this compensating is considered in optical design; and that the aberration of the optical system design and the manufacture precision of optical components should not cause the decline in visibility of the fringe is analyzed, also. The machinel part includes precision rails and delay line carriage. The rails require high stability and parallelism. The cart should be quakeproof when it is moved continuously in the observation process, so the rolling friction drive mode is selected as the suitable link method between the carriage and the rails. The control part includes delay line carriage device control and laser metrology system device control. During an observation, an astrometric model provides a demand cart position and velocity to control computer, the control computer send them to the device controllers. The metrology system produces tracking error fed back to the cart device controller via the control system. This feedback servo loop controls the tracking error.
KeywordStellar Optical Interferometry Delay Line System Optical Path Difference
Subject Area恒星光干涉及综合孔径
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/560
Collection中国科学院南京天文光学技术研究所_会议论文
天文光谱和高分辨成像技术研究室_会议论文
Recommended Citation
GB/T 7714
Wu Zhen,Zhu Yongtian,Chen Yi,et al. Optical Delay Line System for the NIAOT Prototype Stellar Interferometer[C]:SPIE,2008:Vol.7013 2W-1-7.
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