Many fine gratings are observed on the isopachic pattern. The multiplication is easy to perform by using Fourier Filter System.
除了主应力和条纹外，还有许多细栅格线，因此利用富氏光学系统可使应力条纹得到倍增。
2
It is pointed out that the successful seperation of isochromic fringes from isopachic ones by using photoelastic method is an experimental breakthrough.