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磁粉探伤中的磁场类型 被引量:1
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作者 王明军 李晓斌 +1 位作者 周京红 田杨 《航天制造技术》 2020年第5期37-40,共4页
磁粉探伤中磁场矢量与缺陷之间的关系尤其重要。从磁场矢量出发,分析了磁粉探伤中常用的磁场类型,提出了磁粉探伤中磁场纬度的概念,并根据磁场纬度把磁场划分为一维磁场、二维磁场和三维磁场。结合这三种磁场的形成原理,讨论了磁粉探伤... 磁粉探伤中磁场矢量与缺陷之间的关系尤其重要。从磁场矢量出发,分析了磁粉探伤中常用的磁场类型,提出了磁粉探伤中磁场纬度的概念,并根据磁场纬度把磁场划分为一维磁场、二维磁场和三维磁场。结合这三种磁场的形成原理,讨论了磁粉探伤中磁场的各种形式,并详细介绍了其产生的方法及应用特点。各种磁场类型都有其检测优势,充分利用磁场类型的选择,可以提高磁粉探伤效率并避免缺陷漏检。 展开更多
关键词 磁粉探伤 磁场类型 磁场纬度 三维磁场
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Gravity and magnetic anomalies field characteristics in the South China Sea and its application for interpretation of igneous rocks 被引量:8
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作者 李淑玲 孟小红 +3 位作者 郭良辉 姚长利 陈召曦 李和群 《Applied Geophysics》 SCIE CSCD 2010年第4期295-305,399,共12页
Igneous rocks in the South China Sea have broad prospects for oil and gas exploration.Integrated geophysical methods are important approaches to study the distribution of igneous rocks and to determine and identify ig... Igneous rocks in the South China Sea have broad prospects for oil and gas exploration.Integrated geophysical methods are important approaches to study the distribution of igneous rocks and to determine and identify igneous rock bodies.Aimed at the characteristics of gravity and magnetic fields in the South China Sea,several potential field processing methods are preferentially selected.Reduction to the pole by variable inclinations in the area of low magnetic latitudes is used to perform reduction processing on magnetic anomalies.The preferential continuation method is used to separate gravity and magnetic anomalies and extract the gravity and magnetic anomaly information of igneous rocks in the shallow part of the South China Sea.The 3D spatial equivalent distribution of igneous rocks in South China Sea is illustrated by the 3 D correlation imaging of magnetic anomalies.Since the local anomaly boundaries are highlighted gravity and magnetic gradients,the distribution characters of different igneous rocks are roughly outlined by gravity and magnetic correlation analysis weighted by gradient.The results show the distribution of igneous rocks is controlled and influenced by deep crustal structure and faulting. 展开更多
关键词 South China Sea gravity and magnetic fields reduction to the pole at low latitudes preferential continuation igneous rock distribution
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Three-dimensional transformation of magnetization direction and magnetic field component at low latitudes based on vertical relationship 被引量:3
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作者 He Tao Xiong Sheng-Qing Wang Wan-Yin 《Applied Geophysics》 SCIE CSCD 2022年第1期91-106,145,共17页
The transformation of the magnetization direction and the magnetic fi eld component is one of the important methods in magnetic data processing and transformation,which can be conducted in both wavenumber and spatial ... The transformation of the magnetization direction and the magnetic fi eld component is one of the important methods in magnetic data processing and transformation,which can be conducted in both wavenumber and spatial domains.The transformation method in the wavenumber domain has simpler processing expression and higher processing effi ciency than in the spatial domain;however,they are unstable at low latitude.In this paper,the conclusion that the sum is 0 of two vertical magnetic fi eld components(magnetization inclinations are also perpendicular)in 2D is used for the 3D transformation of the magnetization direction and the magnetic field component.In addition,the transformation method at low latitudes based on vertical relationship(VMT)is proposed,which is an iterative algorithm that converts the transformation of the magnetization direction and the magnetic field component at the low latitude into the high latitude.This method restrains the instability of transformation of constant and variable magnetization direction and magnetic fi eld components in low latitudes.The accuracy,stability,and practicality are verifi ed from synthetic models and real data. 展开更多
关键词 the transformation of magnetization direction and magnetic field component wavenumber domain low latitudes vertical relationship iterative algorithm.
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