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基于矢量波函数之间的正交性等,得出了任意电磁波束的零阶场和x,y,z一阶场等粒子散射场的表达式,给出了各阶入射场展开系数与散射场展开系数的通用关系,以椭圆高斯波束为例,研究了椭圆高斯波束中粒子的散射特性,通过仿真分析了波束腰宽、照射距离等对散射特性的影响,验证了本文算法的有效性;研究表明:波束腰宽可以改善粒子的识别性能,波束中的粒子具有较强的前向后向散射特性.方法简单,为研究电磁波束的粒子散射特性探索了新的途径.
Based on the orthogonality among vector wave functions, the expressions of the zero-order field and the first-order field of x, y, z and other particle scattering fields of arbitrary electromagnetic beams are obtained. The expansion coefficients and scattering The common relationship between the coefficients of the field expansion and the elliptic Gaussian beam is taken as an example to study the scattering characteristics of the particles in the elliptic Gaussian beam. The influence of the beam waist width and irradiation distance on the scattering characteristics is analyzed. The effectiveness of the proposed algorithm is verified The results show that the beam waist width can improve the recognition performance of the particles, and the particles in the beam have strong forward backscattering characteristics. The method is simple, and a new way is explored to study the particle scattering characteristics of the electromagnetic beam.