SONAR PROJECTOR Russian patent published in 1995 - IPC

FIELD: underwater acoustics. SUBSTANCE: sonar projector has active element in the form of set of piezoceramic washers with polarization over height placed between conical front and rear straps, coupling bolt with nut. Base of smaller radius of conical front strap faces rod active element. First set of circular spacers is made of acoustically hard material and second set of circular spacers is produced from acoustically soft material. Spacers of these sets are arranged in staggered order between front strap, rod active element and its piezoceramic washers. Spacers of first and second sets placed between front strap and rod active element are manufactured from flexible material. Resonance frequency of system flexible spacer-front conical strap is f=(0.65-0.7), where f is frequency of half-wave resonance of rod active element. Outer diameter of circular spacers of first set equals that of piezoceramic washers, inner diameter of circular spacers of second set equals that of piezoceramic washers. Ratio of radius of bigger base of front conical strap to radius of its smaller base is equal to 4.0-4.5. Height of all circular spacers amounts to 0.2 height of piezoceramic washers and area of cross-section of all circular spacers amounts to 0.1 area of cross-section of piezoceramic washers. EFFECT: enhanced efficiency. 3 dwg