LASER HYDROPHONE Russian patent published in 2007 - IPC G01H9/00 H04R1/44 

FIELD: hydro acoustics.

SUBSTANCE: laser hydrophone can be used for measuring parameters of noise radiation of moving underwater object. Optical grating is projected into tested medium by means of optical system; pitch of grooves of grating is known, which grooves belong to plane which has image to be oriented orthogonal in liquid and images of the grooves themselves are parallel to casing of underwater object's case. Oscillation velocity of sonic wave, irradiated by case of underwater object's case can be found from frequency of optical signal induced by motion of light-dissipating particles. There is ability of changing in length of measuring base and of conducting measurements of oscillation velocity of sonic waves as "in site" and inside larger tested area. When laser hydrophone operates in particular mode there comes the ability of measuring of distribution of oscillation velocity value along casing of underwater object's case. Local characteristics and integral characteristics of acoustic field can be measured simultaneously in tested area along longitudinal axis of underwater object.

EFFECT: improved precision of measurement.

4 cl, 1 dwg