| 强磁性三度体内部磁化强度的分布 |
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| 引用本文： | 吴宣志,刘心铸.强磁性三度体内部磁化强度的分布[J].地球物理学报,1982,25(5):470-480. |
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| 作者姓名： | 吴宣志 刘心铸 |
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| 作者单位： | 中国地质科学院矿床地质研究所 |
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| 摘 要： | 本文讨论稳定磁化场中强磁性三度体内部磁化强度的数值解法。展示了由于退磁作用而造成的不均匀性,并以长方体内一些典型截面为例,较详细地讨论了磁化强度的特征,作了分布图;推导了较均匀磁化体磁化强度分布的近似公式,并计算了一组长方体的视退磁系数。
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| 关 键 词： | 磁化强度 三度体 退磁系数 强磁性 不均匀磁化 长方体 磁性体 均匀磁化体 磁异常 体元 |
| 收稿时间： | 1980-07-17 |
MAGNETIZATION DISTRIBUTION OF 3-DIMENSIONAL BODIES OF HIGH SUSCEPTIBILITY |
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| WU XUAN-ZHI,LIU XIN-ZHU.MAGNETIZATION DISTRIBUTION OF 3-DIMENSIONAL BODIES OF HIGH SUSCEPTIBILITY[J].Chinese Journal of Geophysics,1982,25(5):470-480. |
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| Authors: | WU XUAN-ZHI LIU XIN-ZHU |
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| Institution: | Institute of Mineral Deposits, Chinese Academy of Geological Sciences |
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| Abstract: | A magnetic body confined by non-quadric surfaces is magnetized inhomogeneously due to its demagnetization, even if it has constant susceptibility or lies in a homogeneous field. It is of interest to know how homogeneous the magnetization is and how to calculate its distribution. Solutions of these questions will benefit the direct problem in magnetic prospecting and the interpretation in well logging.In the present paper a numerical method is discussed which is used to calculate magnetization of an arbitrarily shaped body with high susceptibility in a stable field. Inhomogeneity caused by demagnetization is shown. With principal sections of cuboids as an example, the paper illustrates the characteristics of demagnetization distribution in detail.In practice, magnetic bodies are frequently of simple form whose magnetization variations are not, significant. Such bodies are designated as "relatively homogeneous" bodies. To define their magnetization distribution an approximate formula is deduced. When observed points are quite far from magnetic bodies in question, the bodies can be regarded as homogeneous. A new concept of "apparent demagnetization coefficient' is proposed and its availability is discussed. In the end, a series of demagnetization coefficients of cuboids are given. |
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