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长春地质学院试题磁法勘探一、回答下列问题 (25分) 1.地球上地磁等偏线的会聚点有几个,为什么?地磁偏角在我国的变化范围如何? 2.在我国范围内影响磁测工作的变化磁场主要有哪些,在工作中如何处理? 3.已知垂直磁秤磁系的平衡关系式是:Z=A+Ksini+2τi/Mcosi 式中A、K为常数;M为磁捧磁矩:i为磁系倾角;τ是悬丝扭力系数。写出该磁系的灵敏度表达式。并讨论i角与灵敏度的关系? 4.写出由低平面Za换算到高平面Ha的频率响应。若已知顺层磁化薄板的Za频谱为Ke~(-ωh),写出斜磁化薄板的Za振幅谱。
Changchun Institute of Geology test magnetic exploration First, to answer the following questions (25 points) 1. Earth’s geomagnetic offset lines converge a few, why? Magnetic declination in our range of changes? 2. In our range of influence Magnetic field changes in the magnetic field are mainly what, how to deal with the work? 3 known magnetic equilibrium scale magnetic balance is: Z = A + Ksini + 2τi / Mcosi where A, K is a constant; M is Magnet holding magnetic moment: i is the magnetic system inclination; τ is the suspension wire torsional coefficient. Write the sensitivity of the magnetic system expression. And discuss the relationship between angle i and sensitivity? 4. Write down the frequency response from the low plane Za to the high plane Ha. If it is known that the Za spectrum of the magnetized sheet is Ke ~ (-ωh), write the Za amplitude spectrum of the slant magnetized sheet.