中文摘要：

水下等离子体声源应用越来越广泛,但其电磁辐射脉冲测量却是一个空白和难点;分析了水下等离子体声源的工作特性,论证了电磁辐射脉冲测量设备,根据国家标准及电磁场辐射理论制定了测量方案,建立了水下等离子体声源电磁辐射脉冲测量系统;结合水下等离子体放电实验,对辐射电场和磁场进行了实时测量,并利用Matlab软件对测量数据进行了分析处理,研究了水下等离子体声源电磁辐射脉冲的时域频域特性。测量结果显示,在10μF/16kV电弧放电条件下,触发脉冲辐射的电场强度为45dBV/m、磁场强度为-112dBA/m,放电脉冲辐射的电场强度为35dBV/m、磁场强度为-98dBA/m。与国家标准规定的限值比较,辐射脉冲还未超过限值。

英文摘要：

On measurement of electromagnetic pulse of underwater plasma sound source arc discharge processes.Discharge voltage and current will have dramatic changes,its duration only several microseconds to several dozens microseconds.On discharge processing,it will radiate electromagnetic pulse.Electromagnetic pulse measurement is vacancy and difficult.The price of standard used electromagnetic radiation（EMR） measurement equipment not only expensive,and unable to satisfy the request.These equipments can＇t afford by school or small enterprise.In this case,it＇s need a utility and inexpensive measurement system.First,according to the discharge voltage and current waveform obtained from the experiment,EMR is very series.It influences the precision of the measurement of underwater plasma discharge.In order to survey the EMR level,according to the electromagnetic radiation measuring technique and the standards,the frequency of the EMR is below 30MHz,so choice whip antenna and annular antenna surveys the electric field and the magnetic field separately.Next,because the output impendence of antennas is 50Ω,the receiver input impendence must be 50Ω,and the connect cable impendence also must be 50Ω.Otherwise the waveform measured will be vibrated.So choose Agilent oscillograph ifiniium 54830D as receiver and 50Ω coaxial-line as connect cable.Third,use Matlab to processing the metrical data.Transform the time-domain of metrical data to the frequency-domain with Matlab.Then add antenna factor（AF） to the data of frequency-domain.Then finally,get the measurement results.The measurement results showed that under the 10F/16kV arc discharge condition,the trigger pulse radiation＇s electric field intensity is 45dBV/m,the magnetic field intensity is-112dBA/m,the discharge pulse radiation electric field intensity is 35dBV/m,the magnetic field intensity is-98dBA/m.It doesn＇t beyond the maximum of standards.The EMR measurement system can satisfy the request.