FIBRE-OPTICAL HYDROPHONE Russian patent published in 1998 - IPC

FIELD: measurement of parameters of noise emission of underwater and surface objects in full-scale basins. SUBSTANCE: fibre- optical hydrophone has receiving membrane loaded to several fibrous coils of different length which make up object arms of interferometers incorporating coherent light sources and photodetectors. Electron circuit including amplifiers, comparators, reference signal sources and scaling devices selects that output signal from all values of them which lies within working range of interferometer which enlarges working range of hydrophone under homodyne mode of conversion of interferometers. EFFECT: enlarged working range of fibre-optical hydrophone. 3 cl, 4 dwg