spiral fringe

Helical fissures are observed on the surface of steel Cr12MoV cold work rolls after rough grinling by use of magnaflux inspection and metallographic examination.

采用磁粉探伤、化学分析及金相检验等方法对Cr12MoV钢冷轧工作辊粗磨后表面呈现的螺旋形波纹进行了检测分析。

The basic principle to check light beam collimation with double spiral moiré fringes is illustrated,and the relationship of the characteristic parameters of double spiral moiré fringes and the angle of pergence,i.

介绍双螺旋叠栅条纹检测光束准直性的基本原理,进一步就双螺旋叠栅条纹的特征参量与被测光束发散角(即光束准直精度)的关系进行分析和推导。