Development of an auto-focus system based on the moire method

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题名:	Development of an auto-focus system based on the moire method
作者:	Lee,JY;Wang,YH;Lai,LJ;Lin,YJ;Chang,YH
贡献者:	光機電研究所
关键词:	GRATINGS
日期:	2011
上传时间:	2012-03-27 16:27:07 (UTC+8)
出版者:	國立中央大學
摘要:	An auto-focus system based on the moire effect and a feedback control method is presented. First, a collimated laser beam passes through a focusing lens then falls incident on the surface of the sample. The deviation of the angle of the light reflected back is proportional to the defocus distance from the sample. The reflected light then passes through two spiral gratings, producing three types of moire pattern which can be observed and recorded by a linear CCD. The defocus distance can be derived from the spiral angle in the moire pattern. The results show that auto-focusing can be achieved by the moire method for glass and mirror samples in a cycle time of less than 0.1 s. (C) 2011 Elsevier Ltd. All rights reserved.
關聯:	MEASUREMENT
显示于类别:	[光機電工程研究所 ] 期刊論文

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