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| Number | Title | Issue Date |
| 7393331 | Vortex bubble-removing and cooling system for the electromagnetic shock wave generator for the lithotripter The present invention relates to a vortex bubble removing and cooling system for the electromagnetic shock wave generator in the lithotripter. The vortex bubble-removing and cooling system comprises a water-full cushion (17), a metal diaphragm (14) ins... | 07/01/2008 |
| 7206256 | Pressure compensated composite polymer outboard sensor assembly The use of a pressure compensation system and composite polymer materials results in a new type of outboard sensor assembly, of the type used to monitor the status and location of towed array systems from boats. The inventive system is lower in cost, easier to manuf... | 04/17/2007 |
| 7170822 | Laminated piezoelectric transducer and method of manufacturing the same The invention is illustrated as an underwater acoustic transducer comprising an active acoustic element for transducing sound and electrical signals; a front and rear housing element disposed on each side of the active acoustic element to define a corresponding fron... | 01/30/2007 |
| 7136324 | Pressure equalizing fluidborne sound projector A solid metallic piston of a fluidborne sound projector is provided with a plurality of parallel spaced fluid passages extending between opposite axial end faces of the piston so as to equalize fluid pressures exerted thereon within a chamber enclosed within an end ... | 11/14/2006 |
| 7104357 | Device for generating focused elastic waves in a material medium such as underground, and method using same An electromechanical device for generating elastic waves in a material medium such as the subsoil in a frequency range where the wavelengths of the waves generated are great in view of the dimensions of the device, and method of implementation. The device comprises ... | 09/12/2006 |
| 6754136 | Hydrophone with automatic inhibition in case an adjustable immersion threshold is exceeded A hydrophone which is automatically inhibited when the immersion depth exceeds a predetermined threshold by action, on the push element (7) of a switch (6), of a flexible wall that bends under the action of the outside pressure. The hydrophone comprise... | 06/22/2004 |
| 6418792 | Pressure compensated transducer A pressure compensated sound transducer is provided wherein compensation and equalization of static ambient pressure variations occurring on the faces of at least one piezoelectric element is achieved by a mensural compensating duct communicating compensa... | 07/16/2002 |
| 6275448 | Pressure-compensated acceleration-insensitive hydrophone A generally cylindrical hydrophone configuration provides compensation for longitudinal accelerations by placing four identical solid piezoelectric transducer elements along its axis with each transducer element being bonded to a head member, two of which... | 08/14/2001 |
| 5828761 | Sound amplification system having a submersible microphone A sound amplification system includes an amplifier and a waterproof microphone. In an exemplary embodiment the microphone includes a transducer within a cavity covered by a resilient waterproof membrane. The system can monitor either the complete frequenc... | 10/27/1998 |
| 5784341 | Underwater acoustic transmitter for large submersion The invention relates to underwater acoustic transmitters intended to be submerged at large depths. It consists in threading the set of annuli forming the transmitter onto an internal tube (303) preferably made from a carbon/resin composite, which support... | 07/21/1998 |
| 5768216 | Flexitensional transducer having a strain compensator In a flextensinal transducer a drive stack provided inside the oval shell has a strain compensator that has a cylinder and piston. The cylinder is provided in the oval shell, and the piston is stiffly attached to the end of the drive stack. Inside the cyl... | 06/16/1998 |
| 5751659 | Ceramic mass loaded longitudinal vibrator A sonar transducer displaying improved reliability and operating characteristics by employing multiple ceramic stacks, novel support structure and an improved gaseous environment.... | 05/12/1998 |
| 5742561 | Transversely driven piston transducer A piston transducer having a central longitudinal axis and at least one piston member and an active transducer section displaced from one another along the longitudinal axis. Movement of the active transducer section is generally in a plane perpendicular ... | 04/21/1998 |
| 5579287 | Process and transducer for emitting wide band and low frequency acoustic waves in unlimited immersion depths The present invention relates to a process and transducer for emitting wide and and low frequency acoustic waves in unlimited immersion depth. The invention is applied to tranducers comprising at least one electro-acoustic motor (1) causing any wall 3 of the sa... | 11/26/1996 |
| 5431058 | Flexural strain gauge acoustic transducer for deep submersion An acoustic transducer of the flexural strain gauge type, in which a shell body of oblong section is stressed by a motor along a major axis of this section. A viscoelastic element absorbs the slow deformation of the shell under the effect of submersion. T... | 07/11/1995 |
| 5361240 | Acoustic sensor A pressure compensated hydrophone assembly consists of a hollow mandrel that has an outer surface. The central portion of the outer surface of the mandrel defines a concavity. A flexible, resilient piezoelectric film is wrapped several times around the ma... | 11/01/1994 |
| 5349568 | Leak locating microphone, method and system for locating fluid leaks in pipes A leak detecting microphone inserted directly into fluid within a pipe includes a housing having a first end being inserted within the pipe and a second opposed end extending outside the pipe. A diaphragm is mounted within the first housing end and an aco... | 09/20/1994 |
| 5345428 | Flextensional transducers A high power, low frequency flextensional transducer (50) for underwater use comprises a number of spaced piezo-electric element stacks (53) between opposed inserts (51, 52). A Kevlar (registered trademark) compression band (54) is wound around the stacks... | 09/06/1994 |
| 5301170 | Ultrasonic sensor mounting device A device for mounting an ultrasonic transducer on user equipment for operation in a contaminating, ambient environment. A housing has a forwardly extending, profiled inner surface for promoting focusing along an axis of ultrasonic waves emitted by a trans... | 04/05/1994 |
| 5222050 | Water-resistant transducer housing with hydrophobic vent An immersion-resistant housing adapted to receive a vibratable diaphragm spanning the interior of the housing to divide the housing into first and second chambers includes a first port communicating between the first chamber and the exterior environment. ... | 06/22/1993 |
| 5172344 | Deep submergence transducer A transducer assembly providing a conversion between the electrical and sonic energy, the transducer assembly being adapted for operating submerged at great depths in ocean waters. The transducer assembly is formed by a front and back plate which are affi... | 12/15/1992 |
| 5155709 | Electro-acoustic transducers A transducer for use in surface ship applications includes a prestress element for providing additional compressive force to an electromechanical driver disposed within the transducer. The transducer includes a shell having inner portions, an electromecha... | 10/13/1992 |
| 5140560 | Pressure compensated transducer system with constrained diaphragm An acoustic source apparatus has a acoustic transducer that is enclosed in substantially rigid and watertight enclosure to resist the pressure of water on the transducer and to seal the transducer from the water. The enclosure has an opening through which... | 08/18/1992 |
| 5043953 | Pressure compensation device for an immersed volume of gas, in particular for an underwater electroacoustic transducer This pressure compensating device for a volume of immersed gas is equipped with mobile or deformable walls and includes an immersed compensation bladder. The bladder is secured in a housing and communicates with the volume to be compensated. It is arrange... | 08/27/1991 |
| 5016228 | Sonar transducers A high power, low frequency flextensional transducer for underwater use comprises a number of spaced piezo-electric element stacks between opposed inserts. The stacks are placed on the plane through the major axis of an elliptical flexural shell and the i... | 05/14/1991 |
| 4996675 | Signal sensor insensitive to static pressure variations A signal sensor automatically compensates for the variations of the static pressure of the medium in which it is placed. The signal sensor comprises one or two assemblies each formed of a piezoelectric sensitive element applied against one face of a flexi... | 02/26/1991 |
| 4991153 | Vibration type transducer The apparatus of the present invention detects the resonant frequency of a vibratory member in contact with a fluid. The detection of the resonant frequency enables the device to be used to detect the density of a fluid which it is in contact with and the... | 02/05/1991 |
| 4964091 | Electroacoustic transducer This invention pertains to the electroacoustic transducer arts and disclo an improved physical construction therefor in which a honeycomb-like member is used to secure both pressure release and thermal transfer for the converting element.... | 10/16/1990 |
| 4951698 | Process and devices for maintaining the gas contained in a submerged enclosure in pressure equilibrium with the outside This invention relates to a device for maintaining the gas contained in a submerged enclosure in pressure equilibrium with the outside, comprising a plurality of deformable bags which are immersed at the same time as said enclosure which are filled with g... | 08/28/1990 |
| 4926397 | Depth alarm for a seismic sensor A hydrophone having a self-contained means for warning an operator that the hydrophone has reached or exceeded a safe design depth limit. The active elements of the hydrophone are bender-type piezoelectric wafers. An internal stop is provided such that in... | 05/15/1990 |
| 4858206 | Ring-shell projector A ring-shell projector capable of simple disassembly and reassembly. The underwater transducer has a driving ring and a pair of flexible diaphragms on either side of the ring with their rims attached to the ring. The ring is formed of an array of electros... | 08/15/1989 |
| 4821244 | Tubular acoustic projector A tubular acoustic projector for underwater use consists of a ceramic, piezo-electric transducer (21A, 21B) contained in a coaxial, electrically-conductive cylindrical housing (10) whose side wall (11) is thin enough to vibrate with the transducers (21A, ... | 04/11/1989 |
| 4803671 | Sensor for acoustic shockwave pulses A sensor for acoustic shockwave pulses, such as in lithotripsy, includes a piezo-electric measuring membrane disposed between two coupling membranes. The intervening space between the coupling membranes is filled with a coupling medium for transmitting th... | 02/07/1989 |
| 4704709 | Transducer assembly with explosive shock protection A Tonpilz transducer having head and tail masses with an interposed active transducer section. The transducer unit is positioned within a housing which has a shoulder portion upon which rests a snubber member which extends to a position just behind the he... | 11/03/1987 |
| 4674074 | Saturated vapor pressure release mechanism A mechanism for compensating an underwater transducer for the ambient hydrostatic pressure. The transducer housing includes a quantity of liquid which may be vaporized in the housing volume. The relative volumes of vapor and liquid depend on the temperatu... | 06/16/1987 |
| 4637000 | Depth transducer protective assembly A ruggedized depth transducer for measuring ambient hydrostatic pressure adjacent an acoustic source wherein the transducer includes a housing having a depth sensor mounted therein. The housing further includes a bore for placing the depth sensor in fluid... | 01/13/1987 |
| 4531468 | Temperature/pressure compensation structure A bladder shaped to conform to the form of the sonar transducer housing of a torpedo in which it is located compensates for volume changes because of temperature changes of the oil which fills the transducer housing. The bladder also compensates for the c... | 07/30/1985 |
| 4524693 | Underwater transducer with depth compensation An underwater transducer in which a ring of piezoelectric ceramic elements vibrates radially in response to an applied voltage. Spacer elements formed of steel are placed between pairs of ceramic elements and used to couple the ring movement to convex dia... | 06/25/1985 |
| 4450544 | Absorptive sonar baffle The acoustical energy absorbing baffle has a pair of restricted orifice screens rigidly secured in parallel, spaced relation by a lattice stiffener. The screen-stiffener assembly is immersed in a viscous fluid contained within a tank sealed with an elasti... | 05/22/1984 |
| 4420826 | Stress relief for flextensional transducer This invention is a device that permits a flextensional transducer to function after the flextensional transducer experiences a pressure equal to or greater than the pressure found at the survival depth of prior art flextensional transducers. The foregoin... | 12/13/1983 |
