瞬变磁张弛效应及其在评价复杂磁异常中的意义

来源期刊：中南大学学报(自然科学版)1985年第2期

论文作者：牛之琏

文章页码：79 - 84

关键词：磁异常； 涡流效应； 磁性体； 张弛； 瞬变； 谱特性； 无磁性； 评价； 衰减曲线； 观测精度

摘    要：本文引用Cole-Cole张弛模型推导出的一维条件下瞬变磁张弛效应场表达式和实验证实:这种效应主要在铁磁性磁性体上观测到,它的时间谱特性按t^-n的规律衰减,n值为1.1—1.7.尽管信息弱,在晚期总是能观测到以它为主的响应;对于以涡流效应为主的时间谱特性也有明显的影响,这些特征有可能应用于评价复杂磁异常。

Abstract: The response of the effect of transient magnetic relaxation used to be neglected in studying the theory of transient electromagnetic methods. According to Cole-Cole relaxation model, the experiments and the expression of the effect field of transient magnetic relaxation under the condition of onedimension proved that this kind of effect had been observed mainly in ferromagnetic bodies, and that its speciality of time spectra was decaying in accordance with t^-n rule （"n" varies from 1.1 to 1.7）. Though the information is weak, yet its main response at later times can be observed and it has a clear influence on the speciality of time spectra mainly of eddy effect. All this speciality may be used in evaluating the anomaly of complex magnetism.