Autofocus system for space cameras

	Autofocus system for space cameras
其他题名	论文其他题名
	Li Z. H.; Wu K. Y.
	2005
发表期刊	Optical Engineering
ISSN	0091-3286
卷号	44 期号:5
摘要	A novel autofocusing technique using a self-imaging approach is developed for a space camera having large aperture and long focus. Its optical system consists of an emitting system, receiving system, and two pentagonal prisms. The emitting system has three parts: a light source, bearnsplitter, and aim slit. The receiving system includes a field lens, two separate lenses, and CCD. Using two little pentaprisms instead of a large planar mirror makes the autofocus system simple and compact. A defocused signal is acquired by measuring the change of the slit self-image position imaged on the CCD. The algorithm to calculate the movement of the slit self-image position is analyzed to achieve sub-pixel position estimation. The results of the experiments show a +/- 10-mu m precision of autofocusing in a range of +/- 5-mm defocusing. The system demonstrates high resolution, easy adjustment, and high reliability. Also this method can meet the requirements of various accurate focus measurement systems. (c) 2005 Society of Photo-Optical Instrumentation Engineers.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/26822
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Li Z. H.,Wu K. Y.. Autofocus system for space cameras[J]. Optical Engineering,2005,44(5).
APA	Li Z. H.,&Wu K. Y..(2005).Autofocus system for space cameras.Optical Engineering,44(5).
MLA	Li Z. H.,et al."Autofocus system for space cameras".Optical Engineering 44.5(2005).

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