2004-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/714185摘要：在許多工業應用中，非破壞檢測的重要性與日俱增。由於超音波探傷儀兼具輕便、操作迅速、準確度與安全性高之特色，因此其在一般工業的非破壞檢測中使用的場合越來越普及。材料常數的測定在許多的工程分析及設計上有重要的地位，材料常數除了可由一般的拉伸試驗中獲得，另外也能夠由縱波及橫波在材料中傳播波速來求得，因此正確的縱波及橫波波速量測在非破壞檢測技術的發展十分重要，本計畫為一年期計畫，主要將發展一套以超音波量測薄層材料的技術，薄層材料系統在現今微機電的製程中有相當多的應用，但也有一些相關問題極待深入研究。 計畫中將提出以振幅頻譜法量測薄層系統的縱波及橫波波速的理論基礎，量測技術與量測系統架設，可以獲得由拉伸試驗機難以量測的薄層材料系統的材料常數及薄層厚度。計畫中亦將對接合面的接合狀況做深入的探討，可以利用振幅頻譜法判斷接合面是否剝離；或者利用反射音壓的振幅比對於接合面的結合狀況做定性上的判斷，本計畫的成果可對於薄層材料系統的製程品質，以及材料常數的測定提供定量的量測方法。 <br> Abstract: The NDT is used widely in the industry for detecting flaws and material properties. Ultrasonic testing becomes more and more popular in many NDT applications because the ultrasonic detector is easy to carry and use. It is very important to have the correct material constants in many engineering applications and designs. We can obtain the material constants from measuring the velocities of longitudinal and shear waves, which is easier than that obtained from tensile testing. It is important to obtain accurate wave velocity, experimentally. In this project, a new method will be used to evaluate the wave velocity of a thin-layered system and the material properties will be determined. An amplitude spectrum technique is used in this project to measure the phase velocities of waves in thin layer media, and the material constants of thin layer media are determined from the wave velocities of longitudinal and shear waves. This technique can also be used to measure the thickness or the wave velocities of electro-deposited coating. Finally, the bounded condition of layers is investigated, which can be estimated from the information of the reflection coefficient or the amplitude spectrum analysis.非破壞檢測薄層系統振幅頻譜法Nondestructive TestingThin-layer SystemAmplitude Spectrum Technique