基于虚拟仪器的海洋电场传感器系统设计

针对舰船上阴极保护系统产生极低频轴频电场问题,设计了一种基于虚拟仪器的海洋电场传感器系统,实现了极低频轴频电场的测量。由于海水的导电性,舰船在海水中产生的极低频电场,随着传播距离的增大衰减很快,容易被环境噪声所掩盖,从而提出了基于自适应谐波小波的谱线增强算法,实验结果表明:该算法可以有效地将微弱的窄带的轴频电场信号从背景噪声中分离出来。

Design of marine electric field sensor system based on virtual instruments

According as the cathodic protection system on board results in an extremely low frequency(ELF) electric field,a marine electric field sensor based on virtual instruments is devised to complete the measurement of the ELF electric field.On the other hand,due to the conductivity of seawater,the ELF electric field produced by ship under water will attenuate speedily with the increase of its propagation distance,will be baffled readily by environmental noises.Therefore,a line enhancement computation method,based on adaptive harmonic wavelet,is proposed.Experimental results demonstrate that this method is workable to effectively separate the faint and narrow-banded axis frequency electric field signals from background noises.