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ct inversion
相关语句
  ct反演
     Character appearance of fault structure in seismic wave CT inversion for mine work faces detecting
     断层构造在矿井工作面震波CT反演中的特征显现
短句来源
     2. Established the method of extracting first arrival time from the ultrasonic signal in the process of CT inversion.
     2.建立CT反演中由超声波信号提取首波时间的拾取方法。
短句来源
     Surface seismic CT releases seismic CT technique from the work of hole drilling and laneway prospecting. To arrange the inspiring points and acceptance points on the ground surface,then the waves will transmit after being inspired. CT inversion can be made by making use of the traveltime and amplitude of earthquake phase recorded such as straight wave,reflected wave and the surface wave.
     地面地震CT将地震CT技术从钻孔和巷道中解放出来 ,在地表面布置激发点和接收点 ,激震传波 ,利用所记录的直达波、反射波以及面波等震相的走时或振幅资料 ,进行CT反演 ,得到波速地震CT图像 ,反映测区覆盖层分区及基底岩性特点与构造分布。
短句来源
     Through practical detecting experiment in geological model,the velocity rebuilding images with different degree between fault structure and laneway were contrasted for getting the different CT inversion characters of the fault structure.
     为获得不同断层构造的CT反演特征,通过实际地质模型探测实验,对断层构造与工作面巷道不同夹角的波速重建图像进行了对比研究.
短句来源
  相似匹配句对
     CT?
     能缩短BT、CT、PT和KPTT。
短句来源
     CT.
     并优于CT等常规检查。
短句来源
     Study on the Method for Multiscale Inversion in Low-dose X-CT
     低密度X射线多尺度层析成像方法研究
     Application of extending Kalman filtering theory in the inversion of Ultrasonic CT
     扩张Kalman滤波法在超声波CT反演计算中的应用
短句来源
     On Inversion and Emphasis
     谈英语的倒装与强调
短句来源
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The computerized tomographical reconstruction methods include transform method and algebraic iteration one. In this paper, the algebruction methods include transform method and ART method has quick convergence and largeock experiments. BPT gives only a rough image with poor resolution in horizontal direction. ART method has quirk convergence and large image contrast, but the boundary effect is high, and time-consuming in inversion computation. Though SIRT method converges slowly and provides a low image...

The computerized tomographical reconstruction methods include transform method and algebraic iteration one. In this paper, the algebruction methods include transform method and ART method has quick convergence and largeock experiments. BPT gives only a rough image with poor resolution in horizontal direction. ART method has quirk convergence and large image contrast, but the boundary effect is high, and time-consuming in inversion computation. Though SIRT method converges slowly and provides a low image contrast, it has less boundary effect and is fast in computation. No serious effect comes from measurement error during image reconstruction. The combined method of ART-SIRT inversion assimilates the advantages of above two methods and always leads to a satisfactory result. The present study indicates that the measurement error in experiment should be highly taken into account in image reconstruction. CT inversion requires huge amount of accurate observational data, which means that poor data will llead to worse result. The attenuation of the sample, the coupling of the sensor with the sample and homogeneity of the sample are key facors effecting the accuracy of the observational data.

CT技术图象重建方法可分为变换法和代数法两大类。本文讨论了几种代数重建法的特点,开展了地球物理CT技术在岩石实验中应用的探讨性工作。研究表明,实验数据的测量误差直接影响着反演结果,当测量误差比较大时,即使数据量很大,也难以提高反演结果的分辨。岩样的吸收、换能器与样品的耦合、岩样均匀性等因素对实验数据的测量精度都有着重要的影响。文中还针对实验条件进行了数值模拟,以检验本方案的可行性,并对当前流行的BPT、ART和SIRT算法及其组合算法的成象能力结合本实验的条件进行了性能的比较。结果表明:BPT方法计算简单,但所给出的图象偏粗糙,特别是在井间观测时水平方向的分辨率较差;ART方法收敛速度快,图象的反差大,反演结果的高频成分比较丰富,但边界异常大;SIRT方法收敛速度慢,图象的低频比较好,结构平滑,边界异常小,反演受测量误差的影响比较小。综合了ART和SIRT两种反演方法特点的ART-SIRT联合反演方法比较理想,发挥出了各自的长处。

Surface seismic CT releases seismic CT technique from the work of hole drilling and laneway prospecting.To arrange the inspiring points and acceptance points on the ground surface,then the waves will transmit after being inspired.CT inversion can be made by making use of the traveltime and amplitude of earthquake phase recorded such as straight wave,reflected wave and the surface wave.Thus he seismic CT image of wave...

Surface seismic CT releases seismic CT technique from the work of hole drilling and laneway prospecting.To arrange the inspiring points and acceptance points on the ground surface,then the waves will transmit after being inspired.CT inversion can be made by making use of the traveltime and amplitude of earthquake phase recorded such as straight wave,reflected wave and the surface wave.Thus he seismic CT image of wave velocity is provided,which can reflect the characteristics and structure of covering layer and bottom rock.To apply this method to the exploration of the Nuclear Power Plant,we find the CT image analysis agree with the result of geophysical prospecting and borehole surveying.

地面地震CT将地震CT技术从钻孔和巷道中解放出来 ,在地表面布置激发点和接收点 ,激震传波 ,利用所记录的直达波、反射波以及面波等震相的走时或振幅资料 ,进行CT反演 ,得到波速地震CT图像 ,反映测区覆盖层分区及基底岩性特点与构造分布。该方法应用于某核电厂勘测 ,CT图像解释与其他物探和钻探成果相吻合。

The algorithm of computerized tomography(CT) inversion method is used to reconstruct a 1-D image of shear wave velocity around a borehole The adopted geologic model of node velocity interpolation element is superior to the conventional methods for calculating s_wave velocity An engineering example is given in the paper

采用层析成像 (CT)的地球物理反演方法 ,重建钻孔周围地层的一维剪切波速度图像 ,采用的节点速度插值单元模型优于常规的剪切波速度计算方法。文中给出了一个工程应用实例

 
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