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激励信号类型及周期对线圈聚焦和检测深度的影响
Influence of excitation signal type and the cycle on the coil focusing and the detection depth
投稿时间:2016-11-30  修订日期:2017-02-08
中文关键词:聚焦度  时域有限元积分方法  激励信号类型  激励信号周期  瞬变电磁探测系统
英文关键词:focus degree  time domain finite element integration method  excitation signal type  excitation signal cycle  transient electromagnetic detection system
基金项目:四川省教育厅科研基金资助项目(15TD0038);成都师范学院校级教改资助项目(2018JG43)
作者单位
杨龙成 College of Computer ScienceChengdu Normal UniversityChengdu Sichuan 611130China 
胡 俊 College of Computer ScienceChengdu Normal UniversityChengdu Sichuan 611130China 
孙连海 College of Computer ScienceChengdu Normal UniversityChengdu Sichuan 611130China 
刘腊梅 College of Computer ScienceChengdu Normal UniversityChengdu Sichuan 611130China 
摘要点击次数: 287
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中文摘要:
      激励信号类型与周期选取是影响瞬变电磁法(TEM)系统检测能力的重要因素。利用时域有限元积分方法对不同激励信号进行仿真,通过发射线圈磁场分布特性与同等深度处磁聚焦效果的对比、分析,确定激励信号类型;根据探测深度与灵敏度依赖于激励信号周期的特性,确定激励信号的最小周期。以此周期为下限,在不同周期下进行仿真,得到接收线圈回波信号变化图与同等深度处的磁通量变化曲线图,对比分析,最终确定周期为500 ms的矩形脉冲作为激励信号较为合适,更有利于磁场能量聚焦与传播的深度。最后对不同厚度的钢板进行仿真,分析回波信号与钢板厚度的关系,为实际瞬变电磁探测系统设计提供理论依据。
英文摘要:
      The excitation signal type and cycle selection are important factors affecting Transient Electromagnetic Method(TEM) system detection ability. Using the time-domain finite element integration method to simulate different excitation signals, through the contrast and analysis of the transmitter coil magnetic field distribution characteristics and magnetic focusing effect in the same depth, the excitation signal types can be determined. For the detection depth and sensitivity depending on the excitation signal cycle, the minimum period of the excitation signal is determined. Taking the minimum period as the lower limit, the simulation is carried out in different cycles, and the receiving coil of the echo effect diagram and the magnetic flux change curves of equivalent depth are obtained. Comparison and analysis are conducted to determine the appropriate cycle. The conclusion is that the rectangular pulse with 500 ms is more suitable as excitation signal, and is helpful to magnetic field energy focusing and the depth of propagation. Finally, the steel plates with different thicknesses are simulated, and the relationships between the echo signal and the thickness of steel plate are analyzed. This work can provide a theoretical basis for the practical transient electromagnetic detection system.
引用本文:杨龙成,胡 俊,孙连海,刘腊梅.激励信号类型及周期对线圈聚焦和检测深度的影响[J].太赫兹科学与电子信息学报,2018,16(3):475~480
DOI:10.11805/TKYDA201803.0475
学科分类代码:
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