Sensor of water and the munition under - marine equiped of such a sensor

摘要

An underwater weapon such as a missile enclosed in a protective tube (22) has a water detector incorporating a resistivity measuring probe (26) with coaxial central and outer cylindrical electrodes (30, 32) with an annular gap (34) between them and an open end. The outer electrode has a series of holes (44) linked to the annular gap, and the probe is located at the bottom of an annular space (28) between the weapon and the protective tube with its open end facing downwards and its central electrode recessed by 1.1-1.3 mm relative to the end of the outer electrode. Preferably, the two electrodes (30, 32) are made from stainless steel and have rough surfaces which are platinum plated, and have an electrically insulating material such as polytetrafluoroethylene (PTFE) between their ends opposite the open end, where the electrodes are connected to an insulated support (36) with connecting wires (46) passing through it. The wires are preferably connected to an alternating current source (50) delivering 19.8 Veff in a single phase at a frequency of 400 Hz.