The basic principles of polarized light microscopy observation were used for measuring the extinction angles (Ae). Pyrocarbon may be classified according to the extinction angles.

• 利用正交偏振光的基本原理测量了沉积炭消光角(Ae),分析了沉积炭的偏光下的形貌,得出随着消光角的增加,在偏光显微镜下的形貌更为粗糙,更富有层次感。