面向目标的小束源照明和成像

Target-oriented beam source illumination and imaging

结合小束源和Fourier传播子,应用Fourier传播子进行面向目标的小束源照明和成像.小束源的合成通过小波束变换中的小束函数获得,而Fourier传播子进行波场外推,完成小束源的波传播.小束源具有空间位置和方向的双局部特性,对于照明和成像,它更加灵活,并有更多的控制方法.通过照明分析,选择面向目标的有效照明小束源,进行部分小束源偏移,可以提供更好的成像质量和计算效率.作为数值试验,我们选用Fourier有限差分传播子,对Marmousi模型和二维SEG-EAGE盐丘模型的数据,试验了小束源对目标结构的方向照明和成像.获得的结果表明,结合小束源和Fourier传播子进行面向目标的照明和成像是切实有效的.

The beam source and Fourier propagator are combined, and Fourier propagator are applied to the target-oriented beam source illumination and imaging. Beam source synthesis is obtained from beam function in beamlet transform, while Fourier propagator performs wavefield extrapolation and wave propagation of beam source. Since beam sources have both location.and direction localizations, it is more flexible and has more control methods for the illumination and imaging. By illumination analysis, the targeted-oriented effective illumination beam sources are picked. Then part beam source migration is employed, which may provide better imaging quality and computation efficiency. As numerical examples, we test directional illumination and imaging using beam source and FFD propagator for the target structure of the Marmousi model and the 2D SEG-EAGE salt model. The obtained results suggest that it is feasible and effective to use Fourier propagator for beam source target-oriented illumination and imaging.