In chapter 3 the type , characteristic and basic principle of ionized wake diagnosis system of microwave interferometer is introduced , include the reflection interferometer and heterodyne interferometer 較詳細地介紹了微波在等離子體中傳輸、反射、折射和截止的理論和條件,并說明了等離子體微波測量的理論基礎(chǔ)。