Design and Experiment of Magnetic Antenna Vibration and Noise Reduction System

The magnetic antenna can receive extremely weak underwater magnetic signals, and induce the magnetic field intensity which can reach the femto-tesla (fT) level, making it widely used in underwater electromagnetic signal detection. However, even the slightest vibration in the environment transmitted to the antenna will make it cut the geomagnetic field movement; as a result, electromagnetic-induced noise would be generated, and affect the performance of the magnetic antenna. The best method to suppress the motion induced noise is to isolate the magnetic antenna effectively from the ambient vibration. In this paper, the vibration reduction requirements of magnetic antenna are identified, and the principle of vibration absorber system of the magnetic antenna model is established. A magnetic antenna damping system, mainly focusing on low frequency, is proposed by using a silicon rubber elastic element. Based on the proposed method, a magnetic antenna damping system with an attenuation rate up to 100 times is designed, and some performance experiments are scheduled. The experiment results show that the performance of the magnetic antenna damping system meets the design requirements.