Abstract:Located in the outpost of national defense, the ocean is an important barrier to safeguard national security and an important carrier for China to implement the "Belt and Road" strategy. Ultra-low frequency sound wave (ULF) is the only information carrier that can propagate long distance underwater, which makes high-power ULF sound wave transmitting equipment gradually become the key of ocean engineering and research. Electromagnetic transducer has the advantages of simple structure principle, large output force, low cost and easy formation of transducer array. It is one of the effective ways to realize high-power ultra-low frequency emission. At present, the developed countries in Europe and the United States have carried out a lot of theoretical and technical research on high-power ultra-low frequency electromagnetic transducers, and have made certain research progress; In this paper, the development status of high-power ultra-low frequency electromagnetic transducers at home and abroad is discussed, the key technologies of equipment development are analyzed, and the development trend and application of ultra-low frequency high-power electromagnetic transducers in the future are prospected.
