The divergenceAngle of light beam was measured with the method of CCD imaging and computed by second moment method.
通过CCD成像方法对准直后的光束发散角进行了测量，利用二阶矩算法计算出光束发散角。
2
Another important application of diffraction theory is the study of the far field divergenceAngle of a collimated light beam.
衍射理论的另一个重要应用就是研究准直光束的远场发散角。
3
The effects of swirl number of primary swirler and radial swirler, area ratio and sleeve divergenceangle on the cold flow field of double swirl air intake were investigated.