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研究生: 林資彬
Lin, Zi-Bin
論文名稱: 微小壓電式錐形感測器:製作、測試與應用
Miniature Piezoelectric Conical Transducer:Fabrication, Evaluation, and Application
指導教授: 李永春
Lee, Yung-Chun
學位類別: 碩士
Master
系所名稱: 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年: 2005
畢業學年度: 93
語文別: 中文
論文頁數: 84
中文關鍵詞: 藍姆波雷利表面波雷射超音波NBS錐形感測器錐形PZT感測元件微細加工準分子雷射
外文關鍵詞: Laser Ultrasonics, NBS Conical Transducer, Conical PZT Element, Excimer Laser
相關次數: 點閱:112下載:7
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  •   準分子雷射微細加工是屬於LIGA-like製程中的一種,它是利用脈衝式的深紫外光(Deep UV Light),配合光罩使用,以打斷分子鍵,瞬間熱吸收與熱膨脹的方式加工,去除工件表面某一特定區域內之表層材料,而達到微細加工的目的。

      本論文研究之目的在於利用準分子雷射微細加工的技巧製作出一微小的錐形PZT感測元件,其頂尖端的直徑約250μm。再以所製作的PZT感測元件設計出類似商用NBS錐形感測器但更小尺寸的微小聲波感測器。NBS錐形感測器是一個點接觸的精密量測儀器,於表面垂直位移有良好的量測結果。它有著微小的接觸面積、高的靈敏度和高達1 MHz的穩定頻率響應,是1980年代所研發出的一標準化聲波感測器。

      本論文所設計的自製感測器將會以標準的商用NBS感測器進行靈敏度校正,和以FEMLAB有限元素分析軟體模擬PZT感測元件於量測上的特性。最後,將會以此微小壓電式錐形感測器應用於雷射超音波的暫態波傳量測上,例如雷利表面波(Rayleigh Surface Wave)和藍姆波(Lamb Waves)。並藉由分析所得到的暫態波傳訊號來得到材料的表面參數等。以證明所自製的感測器於波傳量測上的可行性。

     The objective of this paper is to investigate thefeasibility of using excimer laser micro-machining technique to fabricate small conical PZT elements with an aperture size around 250 or less. The machined PZT element is then used to construct a miniature acoustic emission transducer which is similar to the conventional NBS conical transducer but much smaller in size. The NBS conical transducer is a point contact transducer for measuring normal surface displacement with high fidelity. It has small contact area, high sensitivity, and a flat response in frequency up to 1 MHz and has been a stander acoustic emission transducer since 1980’s. In this work, the transducer is further miniaturized with the help of excimer laser micromachining method.
     
     The constructed conical transducer will be calibrated by a stander commercial NBS conical transducer and will be theoretically analyzed by a finite element software, FEMLAB. The goal is to simulate the characteristics of the conical PZT element and measurement sensitivity. Furthermore, we will apply the miniature conical piezoelectric transducers to laser ultrasonic measurement of transient elastic waves such as Rayleigh surface waves and Lamb waves. Finally, by analyzsis of these transient elastic waves to inversely deduce important characteristics such material properties and the natures of the acoustic emission sources.

    中文摘要.....................................................I 英文摘要.....................................................III 誌謝.........................................................IV 目錄.........................................................V 表目錄.......................................................VIII 圖目錄.......................................................IX 符號說明.....................................................XIII 第一章 緒論.................................................1  1-1 前言..................................................1  1-2 研究目標..............................................3  1-3 本文架構..............................................4 第二章 準分子雷射加工聲波感測元件...........................5  2-1 準分子雷射............................................5  2-2 KrF準分子雷射加工系統................................ 6  2-3 實驗原理..............................................8  2-4 實驗方法.............................................10  2-5 實驗結果.............................................12 第三章 錐形感測器的製作、測試與FEMLAB模擬..................17  3-1 錐形感測器的製作.....................................17   3-1-1 設計原理.........................................17   3-1-2 製作過程.........................................17  3-2 FEMLAB有限元素模擬...................................21   3-2-1 有限元素法簡介...................................21   3-2-2 FEMLAB模擬.......................................22  3-3 板波聲場測試.........................................36   3-3-1 電路設計.........................................36   3-3-2 實驗流程、架構...................................38   3-3-3 實驗結果.........................................40 第四章 雷射超音波應用與感測器靈敏度校正....................52  4-1 雷射超音波生成機制...................................52  4-2 錐形感測器靈敏度校正.................................54  4-3 等向性材料表面波波速量測.............................60   4-3-1 理論計算.........................................60   4-3-2 量測方法與結果...................................61  4-4 非等向性材料表面波波速量測...........................65   4-4-1 理論計算.........................................65   4-4-2 實驗方法與結果...................................70  4-5 等向性薄板頻散量測...................................72   4-5-1 相位頻譜分析法...................................72   4-5-2 實驗方法與結果...................................74 第五章 結論................................................80 參考文獻....................................................82

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