基于长基线测量的水下电场特性分析研究

Characteristics of Underwater Electric Field Based on Long-base Line Measurement

目的研究海洋环境电场的空间分布。方法借助长基线测量系统提供的一定空间增益,提高测量信号的强度,从而测量低频电场不同测量体在24 h内的幅度变化,以及0.1,0.2,0.5,1,10 Hz等5个不同典型频点的概率密度分布。结果水下电场的空间分布会由于电极间距的不同导致幅度有所差异,但整体的变化趋势基本一致。0.1,0.2,0.5,1 Hz频点随着频率的增加,幅度对整体的贡献越来越小,而10 Hz频点的幅度变化无明显规律。在24 h的连续观测中,DC-1 Hz极低频电场的幅度分布并不满足正态分布,而是随着时间变化具有一定的规律性。结论得到了不同频点的海洋水下环境电场的空间分布特性。

Objective To research spatial distribution of electric field in marine environment. Methods Certain spatial gain was supplied based on the long-base line measurement system to increase the strength of measurement signal and measure the variation of amplitude of different measurement bodies in low-frequency electric field and the probability density distribution of 0.1, 0.2, 0.5, 1 and 10 Hz canonical frequency points in 24 hours. Results The spatial distribution of underwater electric field was various due to the different electrode separation, but the overall change tendency was almost the same. The contributions to the whole from frequency points 0.1, 0.2, 0.5 and 1 Hz decreased with the increase of frequency, while the rule of amplitude variation at 10 Hz was not apparent. In the 24 hours of continuous observation, the DC-1 Hz amplitude distribution of extremely low frequency electric field didn＇t comply with normal distribution, but presented regularity with time change. Conclusion The spatial distribution characters of underwater electric field in ocean environment are obtained.