在第二章中，介绍了引力辐射，主要是对引力场的线性化求解，即弱场近似作了介绍。
In chapter two, it explains gravitational radiation, especially the linear solution in gravitational field. That means it gives explanation to weak field.
采用矢量场法，得到了在弱导条件下传导模式的特征方程和截止频率的近似计算公式。
The eigenvalue equation and approximate formula for cut-off frequencies of guided modes are obtained by vector-field-method.
光束模式展开法可用于近似计算远场的弱截断光束。
The beam expansion method is suited to approximate the weakly truncated beams in the far field.
应用推荐