Abstract
Communication between the inner and outer of the subsea pipeline is the key technique for the smart plugging system. For this technique, a theoretical calculation method and results for the penetration frequency centering on the choice of Extremely Low Frequency (ELF) electromagnetic communication wave is put forward. Meanwhile a simulated experiment in the lab is conducted to verify the theoretical calculation results. It is demonstrated that the optimal frequency band is 9.27~37.037 Hz in theory when the ELF electromagnetic wave penetrates the seawater. The result of test is 10~30 Hz with the maximum induction times 20 Hz which fits the theoretical results closely. Based on the research the overall design of ELF electromagnetic communication is presented and preliminary debug is conducted successfully.
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