Multi-aperture Radiation Characteristic Research On Transient Electromagnetic Field

Being a method of time-domain electrical magnetic surveying, the transient electromagnetic method(TEM) can transmit first pulse electromagnetic field to underground making use of loop or electrical source and receive secondary induction field during of the pulse intermission. The rule of induction bow attenuation wave that is excited first field and formed in internal will be different with the difference of electric capability of geology body and existence position. So this method can resolve geology question and predigest consumedly research of geology object abnormity.With the improvement of precise demand new tasks will also appear for study of transient electromagnetic method. According to practice of transient electromagnetic operators, this paper will introduce a new multi-aperture transient electromagnetic method integrating a lot of simulation experiment data on the base of its primary theory and transmission rule. In the end, result shows this new method can improve so much direction of electromagnetic field that it increases lognitudinal resolving power. The main contents is as follows:The first chapter introduces summarization, it simply introduces the developed general situation and basic theory, it also brings forward main research contents and meanings in the future.The second chapter is about model experiment study, it introduces purpose, scheme, equipment and experiment contents having copperplate and copper ball as object by comparability rule experimenting plenty of physical models, deals with experiment data and makes second field attenuation voltage curves first field isoline both single aperture and mutli-aperture in different situation. In the end, it obtains best depth of multi-aperture source.The third chapter is experiment analyses of multi-aperture transient electromagnetic method, it analyzes multi-aperture transient method in theory and discusses radiation direction characteristic of first field by means phased array theoryand integrating result of experiment contrast. According to kinematics character it also brings forward similar interference concept and analyzes reason of similar interference phenomenon, it gained footing between similar interference item and depth on the base of it and experiment formula.The forth chapter is about conclusion and suggestion. It simply concludes innovation point of this paper, introducing work assume in the future and brings forward shortcoming of this experiment.It is important significance to apply this theory and technology to improve precise of TEM data and resolving power. The main purpose of this paper is obtaining conclusion by via of experiment, because it have not report about multi-aperture TEM technology so far. It can match multi- channels transient electromagnetic apparatus if this method comes true, further, connect data collection technology with imaging software system.In conclusion, it will immit new energy for exploration means of transient electromagnetic method, moreover its production will in practically have great significance to TEM applying and generalizing.