三、相衬方法的基本原理及其应用 相衬方法(又称相衬显微镜术)就是在显微镜中利用一种特殊的光学装置来提高物像反差(又称衬度)的方法。相衬方法已有三十多年的历史,但是早期生产的金相显微镜,一般都没有相衬附件。近十多年来,国外生产的金相显微镜已普遍配备有相衬附件。在国内,这一金相技术的应用还不够普遍,下面简要介绍相衬方法的基本原理,并 Third, the basic principle of phase contrast method and its application Phase contrast method (also known as phase contrast microscopy) is the use of a special optical device in the microscope to improve the contrast of the image (also known as contrast) method. Phase contrast method has been more than three decades of history, but the early production of metallographic microscope, generally no phase contrast attachment. In the past ten years or so, metallurgical microscopes produced abroad have generally been equipped with phase contrast accessories. In China, the application of this metallurgical technology is not yet universal, the following briefly introduces the basic principles of phase contrast method, and