Low frequency hydrophone and sonar antenna using such hydrophones

摘要

The low-frequency hydrophone for a sonar antenna comprises at least one lacunate ceramic (10) having open porosity saturated by a viscous fluid, on which ceramic have been deposited metal electrodes (13). This hydrophone forms a filter of the high-pass type the low cut off frequency of which is adjusted by modulating the surface of the electrodes. …??The invention is applicable, especially, to towed linear antennas and to passive sonars. …IMAGE…