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題名 | Analysis of Moiré Pattern for Micro-range Measurements based on Continuous Wavelet Transform=連續小波轉換在微米距離量測之分析 |
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作者 | 許金益; 胡宇正; 黃志毅; 李俊奇; | 書刊名 | 中國機械工程學刊 |
卷期 | 30:5 2009.10[民98.10] |
頁次 | 頁431-435 |
分類號 | 446.8401 |
關鍵詞 | 連續小波轉換; 微米距離量測; CWT; Moiré; Grating; |
語文 | 英文(English) |
中文摘要 | 在本篇論文中,我們以疊紋技術和連續小波轉換之數學技巧來進行微米距離之量測,此方法是利用小波轉換計算疊紋間距之變化以得到實際之微米量測距離,比起早期昂貴又複雜的方法,這種技術簡單又經濟,實驗結果證實了此種方法非常有效且十分精確。 |
英文摘要 | In this paper, a new approach based on the moiré theory and continuous wavelet transform (CWT) is proposed for measuring the micro-range distance between an object grating and a reference grating. When an object grating is imaged by thin lens, then the moiré pattern image is obtained from the overlapping of the imaged grating and the reference grating. The period of the moiré pattern image will be changed when we move the object grating closer or further away from the thin lens. The micro-range distance is obtained directly by measuring the pitch of the moiré pattern, the pitch of the moiré pattern can be estimated by counting the number of fringe with the CWT technique. Experimental results prove that this technique is very efficient and highly accurate. The experimental set up is an economic technique for measuring a micro-range distance. |
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