| 摘要: |
| 将高精度质子磁探仪和位场变换理论用于测量计算船舶磁场，以研究其在海洋中的分布。由质子磁探仪实测海面下10m处磁场的模（船的磁场与地磁场矢量的和的绝对值），用住场变换理论计算出船的磁场三个分量在水面和水下的分布；并采取一系列有效措施，提高计算速度和结果的精度。将该方法和磁球理论严格解比较，在z=0面上误差小于0.1％，在z=-20 m面上误差小于1％；还给出船的磁场强度在船的纵横向的分布曲线和平面立体分布图。 |
| 关键词: 船舶磁场分布 质子磁探仪 位场变换理论 |
| DOI： |
| 分类号: |
| 基金项目:本课题由海军资助 |
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| NEW HIGH PRECISION METHOD TO MEASURE AND COMPUTE MAGNETIC FIELD OF SHIP |
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Chen Yun1, Zhao Peicong1, Gu Xinhong2, Cao Quanlin2, Luo Fagui2, Wang Shuoru3
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1.Physical Department, Ocean University of Qingdoo, Qingdoo 266003;2.Navy 38618, Zhan Jiang 524022;3.Geologicol Department, Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| The single component magnetometer now used in measuring a ship’s magnetic field has poor precision and reliability. High precision proton magnetometers can only be used to measure the modul of magnetic intensity. In this paper the theory of magnetic potential field transformation is introduced to calculate the magnetic field of ships. |T| the absolute value of the vector sum, a ship’s magnetic intensity H and terrestrial magnetic field intensity T0, is measured by using a proton magnetometer under sea surface 10 m. ΔH = |T| - |T0 is taken to be approximately the projection of H in the direction of T0. The distribution of the three components of the magnetic intensity of a ship under the sea surface 10 m was inferred and then its distribution under the sea surface was deduced by means of the Green Function method. A 5000 ton ship was used to carry out practical measurement with a wooden boat. Some effective techniques were used in data processing to shorten computing time and improve accuracy. This method is compatible with magnetic sphere theory. The error is less than 0.1% on z = 0 and less than 1% on z = -20 m. The distribution curve of the magnetic field intensity and it’s three components in the longitudinal and transverse directions of the ship and the isodynamic line and three-dimension chart of the magnetic intensity of the ship are given. |
| Key words: Magnetic field of ship, Proton magnetometer, Potential field transformation |
