走时层析成像正反演方法研究

The research on travel-time tomography based on forward calculation and inversion

在资源勘探及工程质量检测等领域的走时层析成像技术具有分辨率高、探测范围广、成像结果直观等特点。走时层析成像技术主要包括两部分研究内容:估计射线路径及走时,进行图象重建。本文基于射线理论,应用最短路径射线追踪方法进行了射线走时的正演计算;并通过对多种反演算法的对比研究,选用SIRT算法进行快速反演成像,最后给出了仿真计算结果,并进行了分析比较,证明了本文正反演算法的有效性和实用性。

The technology of travel-time tomography,widely used in the fields such as resource exploration and quality testing of construction,is characterized by high resolution,wide detection range and visual imaging.The technology includes two parts—the estimation of ray tracing and travel time;the rebuilding of images.This paper,based on ray theory,provides forward calculation by using the shortest path ray tracing;it also presents fast inversion imaging based on SIRT by comparing different inversions;finally,it provides the stimulation results and the comparison,as well as the analysis of the results to prove the validity and practicability of the forward calculation and inversion.