相函数 meaning in English

phase function

Secondly , the mathematical radiation extinction model of nonspherical particle is developed based on t - matrix method , and a computer program is designed to calculate the extinction cross section , scattering cross section , absorption cross section and scattering phase function of fixed or randomly oriented axially symmetric particle
然后根据t矩阵方法，采用回转体微粒消光特性的计算模型编制出的相应程序，对固定取向和随机取向的非球形回转体微粒的消光截面、散射截面、吸收截面及散射相函数进行了计算。