SURFACE-UNDERWATER METAL DETECTOR Russian patent published in 2001 - IPC

FIELD: search devices employed in geophysics. SUBSTANCE: surface-underwater metal detector has leak-tight body with clear window that houses geological compass. Ferrite bars with windings fed with controlled high-stability current are anchored on the left and on the right of compass card to form together with pointer electromagnetic spring that responds to magnetic field. Ends of pointer carry two mirrors designed to send beam from light-emitting diode on to receiving window of microcircuit of mining surveyor's wire measure matched with digital voltmeter. EFFECT: capability for tuning away from magnetic background. 1 dwg