Sonar for avoiding sub-surface underwater objects
It consists in using an acoustic antenna having two columns of n transducers, the first column insonifying, at transmission, an elevation sector corresponding to the collision-risk zone and forming ...
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Electro-acoustic transducers
A flextensional transducer for use in surface ship applications requiring the capability of withstanding underwater explosive shock is described. The transducer includes a plurality of ceramic stacked ...
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Mount for underwater acoustic projector
A mount for acoustic transducers has a resilient sheet with a plurality of mounting apertures therein. Each mounting aperture has an annular groove formed about the inside surface of the sheet to ...
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UNDERWATER BROADBAND ACOUSTIC TRANSDUCER
The invention relates to underwater acoustic transducers for emitting a low-frequency broadband acoustic signal. The inventive transducer consists of a cylinder-shaped cap (105) which is closed at one ...
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Underwater sound localization system
A control system connected to a passive underwater transducer array is located remotely from the array, e.g. above the surface of the water, to localize an underwater source of acoustic energy in a ...
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Passive active underwater sound detection apparatus
A three-dimensional large scale rectilinear array of hydrophones comprising a plurality of equally spaced, fixed position, omni- directional, electro-acoustic transducers, utilizes aperture steering ...
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UNDERWATER PROFILE DETECTOR DEVICE
Patent Publication Date: comprises two separate substantially planar acoustic transducers (22) which are capable of issuing profile detection signals simultaneously, and which are adjustable together ...
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Underwater antenna
An underwater aerial comprising a housing (10) containing an integral transducer unit (13) made of numerous electro-acoustic transducers (131), and transducer operating components (17). The latter are ...
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Acoustic transmitting antenna for underwater seismic prospecting
... suspended electro-acoustic transducers 403 wherein each of said transducers are assigned to a frequency of the pulse spectrum to be emitted. The transducers are attached to the cable at such positions ...
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Buoyant device for bi-directional acousto-optic signal transfer across the air-...
... underwater. A buoy having a shell to float on water has an upper portion in air and a lower portion in water. An array of acoustic transducers which is disposed in the lower portion receives acoustic ...
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