Discretization in angularcoordinate is needed only and the global equation is a second order characteristic matrix equation.
该一维有限元列式只需对扇形区域在角度方向上离散，最后的总体方程为一个二次特征根方程。
2
The angularcoordinate used a DVR based on Legendre polynomials and the radial coordinates utilized a DVR based on sine basis functions.
角度部分的DVR基组选择勒让德多项式形式，而径向坐标采用正弦函数形式。
3
According to this model, the parallel misalignment and angular misalignment can be calculated so long as light spot coordinate of PSD at two discretionary angles is measured.