【摘要】 本文通过采用广泛运用于声波、地震波CT中的SIRT法,对BPT法作了一些改进,用"dij/li"替换"dij"作为第i条射线在第j个网格中的权值,使那些较小的dij(dij=li)在传统的BPT法中权值微小,而在改进型BPT法中却有最大的权值,用其计算结果作为CT反演计算的初值,同时将BPT法融合到SIRT法中去,使射线与网格符合"近则优"的原则,称之为改进型SIRT法,能起到有效压制野外资料外界干扰的影响,在实际应用中已取得明显效果。更多还原

【Abstract】 The paper improved the BPT method that widely used in SIRT method of sonic and seismic wave CT method.Using "dij/li"to replace "dij"and be as weight of ith ray in jth grid,making the minor dij(dij=li) have max weight in improved BPT method,while in traditional BPT method the minor dij(dij=li) has smaller weight.Using their computational results to be initial value of CT inversion and merging the BPT method into SIRT method,which make the rays and grids conform to the principle of "the nearest being the best",which is called as improved SIRT method that can effectively suppress the influence of outdoor interference on field data and achieved significant effect in practical application.更多还原