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研究生:馮熊年
研究生(外文):Hsiung-Nien Feng
論文名稱:光學干涉術在裂縫應變場量測之應用
論文名稱(外文):Measurements of crack-tip strain using laser interferometer
指導教授:施勝雄
指導教授(外文):Sheng-Hsiung Shih
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:製造科技研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:70
中文關鍵詞:干涉術移相法裂縫應變場
外文關鍵詞:interferometerphase-shiftingcrackstrain field
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本論文介紹移相邁克森、疊紋、及Savart 剪切干涉儀之架設及原理,並將它們應用於裂縫應變場之量測。其中,移相Savart剪切干涉儀應用在裂縫應變場量測是本研究首先提出的觀念,因此對它的說明與應用,著墨最多。
移相Savart剪切干涉儀包含一雷射源、Savart菱鏡、偏極板、CCD攝影機、及個人電腦。Savart 菱鏡為一光學影像剪切元件,可將入射光分為互相平行且偏極態互相垂直的兩束光;因此當物光經Savart菱鏡及偏極板後,將形成一剪切干涉圖並被CCD攝影機記錄至個人電腦中。移相機構是去旋轉Savart菱鏡,使它繞剪移面之法線旋轉,如此可移動干涉圖之相位。
我們以五步相移邁克森、疊紋、及Savart 剪切干涉儀應用於裂縫應變場之量測,並進行彼此量測結果之比對,比對結果說明Savart剪切干涉儀是可正確有效地應用於裂縫應變場之量測。
This thesis introduces the Michelson, Moire’, and Savart shearing interferometers and adopts them as the tools for determining the strain fields at a crack tip. The crack tip strain field measurements using Savart shearing interferometer is a new concept and first proposed in this research, thus the description and application of the Savart shearing interferometer are more detailedly.
The Savart shearing interferometer consists of a laser source, Savart polariscope, polarizer, and CCD camera. Where the Savart polariscope is the shearing device that divides the incoming beam into two parallel beams whose polarizations are orthogonal. Thus as a beam coming from the object and passing through the Savart polariscope and polarizer will generate a shearing interference pattern on the CCD camera. The phase-shifting mechanism is to rotate the Savart polariscope about an axis normal to the plane includes the two parallel beams so the phase of the interference pattern can be shifted.
We adopt five-steps phase-shifting Michelson, Moire’, and Savart shearing interferometers to determine the crack tip strains and compare the measurement results with each other. The comparisons agree the validity and applicability as the Savart shearing interferometer is applied for the crack strain measurements.
摘要 iii
Abstract iv
誌謝 v
目錄 vi
圖目錄 ix
第一章 緒論 1
第二章 相關理論 6
第三章 各干涉術原理回顧 10
第四章 移相術 16
第五章 實驗系統 27
第六章 實驗與結果 31
第七章 討論與結論 65
參考文獻 67
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