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

Ju Yi Lee, Yung Hsing Wang, Lyu Jhen Lai, Yu Ju Lin, Yu Hsiu Chang

研究成果: 雜誌貢獻回顧評介論文同行評審

18 引文 斯高帕斯(Scopus)


An auto-focus system based on the moiré 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 moiré pattern which can be observed and recorded by a linear CCD. The defocus distance can be derived from the spiral angle in the moiré pattern. The results show that auto-focusing can be achieved by the moiré method for glass and mirror samples in a cycle time of less than 0.1 s.

頁(從 - 到)1793-1800
期刊Measurement: Journal of the International Measurement Confederation
出版狀態已出版 - 12月 2011


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