在本論文中，我們利用一維的彈性物質的週期層狀結構結合非線性聲學介質，並運用聲子晶體的能隙概念及非線性聲學介質特性，設計具聲波整流作用的聲波二極體。我們藉由調變物理參數探討聲波二極體的整流效益之變化，並分析將二極體中的周期層狀結構代換為非週期層狀結構時所產生的差異，以及其誤差值是否會造成二極體失去整流效益。 聲波二極體具有可調性，選擇適當物理參數即可獲得想要的整流效益。聲波二極體能應用於聲學裝置的保護，也有機會在未來的生物或醫學領域中找到應用。 We discuss the design and analysis of acoustic diodes consisted of one-dimensional elastic periodic structure. An acoustic diode is formed by coupling a periodic medium that consists of water and glass layers with an appropriately chosen nonlinear acoustic medium. The rectifying efficiency of acoustic wave is determined by the band-gap effect of the phononic crystal and the properties of the nonlinear acoustic medium. We compare the results of different incidence angles of the acoustic wave and analyze the influences of various physical parameters on the rectifying efficiency. We also discuss the analysis and illustration of acoustic diode for random situations. Acoustic diode has high adjustability. We can get desired rectifying efficiency by properly choosing the material and structure parameters. Acoustic diode can be applied to protect acoustic devices, and may play a role in the future applications of biology research or medical therapy.
