基于图像灰度的羽流模型建立及羽流对电波传播特性的影响

Plume modeling based on the gray image and its effect on the characteristics of EM wave propagation

结合计算机图形学原理和非均匀介质中的电波传播理论,提出一种高效的基于图像的电磁建模方法,并将其用于等离子体羽流的电波传播特性研究.该方法以光学照片为基础,进行基于像素点的采样,得到照片的光学强度分布.利用光学强度分布与对应物理量的关系,以数字图像处理技术还原照片中的数据.在此基础上,根据物理模型的旋转对称性这一特点,以升维度方式还原图像所描述的物理模型,从而实现三维计算模型的创建.这种建模方法可更加真实地反映物理模型的空间分布性态,因而能够为实际问题的分析提供有效、可靠的仿真模型.然后,利用本方法建立羽流三维模型,采用移位算子法分析电波在其中的传播特性,发现了一些特殊的传播现象.由于所建模型来源于实验场景照片,因而所得的传播现象能够更加真实地反映电波在羽流中的传播特性,为工程应用提供有价值的参考.

To build a plume model, an efficient numerical modeling method based on the principle of computer graphics is presented in this paper. Firstly, using the optical photograph, the optical intensity distribution of the photo is obtained based on the pixel sampling. Then, according to the optical intensity distribution of the photograph and combining the numerical image processing technique, the calculation model of the plume is established. The modeling process shows that the modeling method is highly effi- cient and very versatile, and thus can provide an effective and reliable simulation model for engineering ap- plications.