OPTICAL DOPPLER HYDROPHONE Russian patent published in 2002 - IPC

FIELD: hydroacoustics; contactless detectors of hydroacoustic signals. SUBSTANCE: hydrophone has laser and first beam splitter, first transmitting lens, first receiving lens, second beam splitter, receiving diaphragm, and photodetector all optically matched with laser; Doppler frequency processing unit, and program unit; receiving diaphragm is mounted in front of photodetector whose output is connected to Doppler frequency processing unit; controlled input of the latter is connected to one of outputs of program unit; it also has third beam splitter mounted in parallel with first one as well as second transmitting and second receiving lenses optically coupled with the latter, fourth beam splitter mounted in parallel with second beam splitter, and five controlled optical gates mounted, respectively, between first beam splitter and first receiving lens, between third beam splitter and second transmitting lens, between third and fourth light splitters, between first receiving lens and second beam splitter, and between second receiving lens and fourth beam splitter; controlled inputs of five optical gates are connected to respective five outputs of program unit. In addition hydrophone has light-dissipation particle generator, device for injecting them into analyzed medium, and optical wave frequency shifter mounted between first beam splitter and first transmitting lens or between third beam splitter and second transmitting lens. First beam splitter is free to displace relative to third beam splitter. EFFECT: enlarged quantity of audio wave parameters analyzed enabling measurement of speed bigradients and gradients of higher-order audio wave as well as estimation of spatial differential characteristics of hydroacoustic field. 4 cl, 2 dwg