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5020035 |
Transducer assemblies
A transducer assembly includes a hollow support member disposed in a looped configuration and having an axial opening. A hollow transducer supported within the support member may be made from a...
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4984222 |
Piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length
A piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length whose respective electrodes are connected in parallel. The interconnection is provided by...
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4933919 |
Hydrophone
A hydrophone having a hollow interior with signal electrodes on the interior surface and an electrically conducting coating over the entire outside surface. Signal leads are connected to the inside...
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4926396 |
High pressure transducer
In a tubular pressure transducer element, the axial stress imparted to the element is reduced relative to the radial stress by inserting a rigid core inside the tubular element. The reduction in...
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4922470 |
Barrel stave projector
An underwater acoustical projector consisting of a spaced apart pair of polygonal shaped end plates, a ceramic driver of smaller cross-sectional size than each end plate, positioned between the end...
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4866683 |
Integrated acoustic receiver or projector
An acoustic element assembly used in underwater receivers and projectors comprises two piezoelectric elements bonded to opposite sides of a hybrid circuit substrate (16). The hybrid circuit...
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4855964 |
Vented-pipe projector
A piezoelectrically-driven, resonant-pipe projector has formed therein vents to broaden the response of certain cavities resonances and to increase the response between these resonances. The...
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4849946 |
Piezo-electric transducer comprising several coaxial sensitive elements
Piezoelectric transducer for the production of, for example, hydrophones, with the transducer including a plurality of sensitive coaxial elements interconnected so as to compensate for the effects...
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4841494 |
Underwater piezoelectric arrangement
Underwater piezoelectric arrangement in which it comprises two piezoelectric elements made of piezoelectric ceramic-polymer composites and juxtaposed to form a single layer structure, one of the...
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4827459 |
High sensitivity accelerometer for crossed dipoles acoustic sensors
An accelerometer for underwater acoustic sensors includes a pair of cylindrical piezoelectric crystals configured in a cantilever mode and having attached thereto an electrode segmented into four...
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4823041 |
Non-directional ultrasonic transducer
A transducer is comprised of a piezoelectric ceramic cylindrical vibrator vibrating radially, and a sheet provided on an outer peripheral surface of the cylindrical vibrator and including a fiber...
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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...
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4809244 |
Support member for pressure sensor
A support for an elongated piezoelectric pressure sensor, which is general cylindrical in shape is mounted on a hollow support member that has a thickness and strength selected to meet desired...
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4782470 |
Hydrophone with extended operational life
Permeation of sea water through the protective rubber housing to the conductive portions of the exterior surface of the ceramic or other pressure-sensitive element results in the development of a...
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4777627 |
Extendible sonobuoy apparatus
A sonobuoy has several components slidably mounted in an elongated tube. The components are longitudinally stacked one above the other at the lower end of the tube when the sonobuoy is in a...
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4768173 |
Pressure wave sensing device of the piezoelectric type with continuous structure and a method of manufacturing same
A pressure wave sensor device is provided including at least two sensitive flexible piezoelectric elements wound in two helices in opposite directions of a tubular support and a method for...
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H000391 |
Piezoelectric polymer hydrophone
A hydrophone comprising a tubular thin-walled member of a piezoelectric polymer such as polyvinylidene with electrodes covering the interior and exterior surfaces of the tubular member. An...
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4706230 |
Underwater low-frequency ultrasonic wave transmitter
Non-active columnar members are disposed on both sides of an active columnar member consisting of a piezoelectric ceramic material or a magnetically strainable material. Levers are connected to the...
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4706229 |
Electroacoustic transducer
An electroacoustic transducer ring has an inner vibratile surface defining a ring cavity with a plurality of arcuately spaced electrodes affixed thereto. Planar partitions are placed in the ring...
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4688306 |
Method of preparing a piezoelectric device
A piezoelectric device comprising a first conductor, a conductive polymer member which contacts the first conductor, a piezoelectric polymer member which contacts the conductive polymer member but...
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4674067 |
Method and apparatus for generating low frequency acoustic energy waves
An acoustic transmitter is employed in a borehole logging tool for generating low frequency acoustic energy waves. A tube of piezoelectric material is sealed at both ends and filled with liquid. A...
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4672592 |
Shaded transducer
A cylindrical transducer for use as a low frequency hydrophone and having inner and outer electrodes at least one of which is deposited in a certain predetermined pattern having smooth continuous...
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4604542 |
Broadband radial vibrator transducer with multiple resonant frequencies
A broadband radial vibrator transducer having at least two laminar resonant sections coupled to a radial electromechanical transducer element where each laminar section includes at least two...
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4546459 |
Method and apparatus for a phased array transducer
A stacked phased array type of transducer has a single electroacoustic transducer element supported intermediately of an elongated tube having a plurality of ports and an end wall at each end...
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4525645 |
Cylindrical bender-type vibration transducer
An acoustic transducer with high sensitivity and low resonance frequency is constructed of a cylinder having inner and outer layers rigidly bonded together. At least one layer is a thickness poled...
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4462093 |
Symmetrical shell support for flextensional transducer
This invention is a transducer support system that couples the weight of the active portion of a transducer to the transducer's flanges without coupling the dynamic motion of the active portion of...
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RE31607 |
Circumferential acoustical detector
An acoustical logging tool having a plurality of long, extendable, resilient arms, and means for remotely extending free ends of the arms into close proximity to the wall of a borehole. A...
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4446544 |
Small diameter, low frequency multimode hydrophone
A multimode hydrophone of small diameter and low weight providing dipole ectivity patterns over a decade range of low frequencies by utilizing a pair of orthogonal dipole signals and a...
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4435794 |
Wall-driven oval ring transducer
This invention is a small light weight underwater transducer that operates at low frequencies. The foregoing is accomplished by embedding piezoelectric material in the wall of an oval shell between...
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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...
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4409681 |
Transducer
An electro-mechanical transducer is disclosed in which a piston-like radiating element is driven by fluid pumped from the interior of a flextensional transducer such that the motion of the...
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4347593 |
Piezoceramic tubular element with zero end displacement
A piezoelectric tubular monopole element with zero end displacement which s an omnidirectional sensitivity over the widest possible frequency range. The center section is radially or...
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4345473 |
Vertical component accelerometer
An accelerometer for measuring the vertical component of acceleration independent of the accelerometer orientation or the pressure. The accelerometer is particularly adapted for use in marine...
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4231112 |
High-power underwater transducer with improved performance and reliability characteristics and method for controlling said improved characteristics
A piezoelectric ceramic cylinder is positioned between a vibratile piston and a matched rigid mass element. To prevent corona, the electrodes on the ceramic cylinder are covered with an insulating...
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4228532 |
Piezoelectric transducer
An electroacoustic transducer having high acoustic-to-electric energy conversion per unit volume. The transducer is in the form of a body having a cylindrical central section and hemispherical end...
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4187556 |
Electro-acoustic transducer with line focus
1. A transducer for translating compressional waves in a liquid medium into lectrical waves in an electric circuit and vice versa comprising an elongated transducer element having a spherically...
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4183010 |
Pressure compensating coaxial line hydrophone and method
The utility of a coaxial electret cable transducer as a hydrophone at shallow depths (low hydrostatic pressure) is extended for operation at substantially greater depths (high hydrostatic pressure)...
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4178577 |
Low frequency hydrophone
A pressure-balanced hydrophone having a low cut-off frequency which inclu a pair of piezo-ceramic tubes, wired in series, and having one end of each tube secured to a metal block in the center. The...
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4134097 |
Combination geophone-hydrophone
A method and apparatus for measuring and identifying up- and down-traveling waves wherein both a velocity-sensitive and pressure-sensitive transducer are disposed at a point below the earth's...
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4081784 |
Omnidirectional monitor buoy
An underwater intrusion alarm system using an array of one or more remotely eployable, acoustic doppler detector probes. Each probe is a unitary submersible buoy formed by a pair of vertically...
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3982144 |
Directional low-frequency ring hydrophone
A small low frequency acoustic receiver which is formed into a cylinder or ing by use of a plurality of separate elements of piezoelectric material. Each element is secured with its sides in...
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3947802 |
Omnidirectional low noise piezoelectric transducer
A piezoelectric ceramic transducer assembly for broadband noise-measuring drophone. A longitudinally polarized lead zirconate-titanate cylinder provided with end caps is sealed by O-rings within a...
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3860901 |
WIDE BAND TRANSDUCER
A transducer assembly comprising one or more ring shaped transducer elements of a ceramic material which are rigidly held between a rear mass and a front mass, both of which are made to vibrate by...
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3846744 |
SHOCK HARDENED TRANSDUCER
A transducer for use underwater and capable of surviving high shock forces ften sustained by ships, submarines, and unretarded air delivery weapons. A ring-shaped piezoelectric ceramic active...
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3845333 |
ALTERNATE LEAD/CERAMIC STAVE FREE-FLOODED CYLINDRICAL TRANSDUCER
A transducer having a cylindrically shaped arrangement of alternating ferlectric elements and loading members provides a continuous broadband capability. By the transducer's discrete dimensioning,...
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3835340 |
TRANSDUCER CORONA SHIELD
In an electroacoustic transducer, corona in the interface between the ceramic transducer element and the electrically conductive transducer end mass, supporting structure, or the like, is...
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3828143 |
PIEZOELECTRIC END CAPPED CYLINDER ASSEMBLY FOR USE TO THE RADIAL-MODE RESONANCE FREQUENCY
A cylindrical end capped piezoelectric transducer element provided with a ncentrically mounted interior post cemented to the end caps. The structure prevents resonance of the end caps to thus...
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3827023 |
PIEZOELECTRIC TRANSDUCER HAVING GOOD SENSITIVITY OVER A WIDE RANGE OF TEMPERATURE AND PRESSURE
An electroacoustic transducer wherein the sensing elements comprise a radly polarized ceramic cylinder having annular rings attached to the ends of the ceramic cylinder and a cylindrical insert,...
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3810083 |
SELF-RIGHTING GEOPHONE
Disclosed is a seismic surface cable detector system where the detector comprises axially aligned, tubular, piezoelectric elements having outer metallic coatings and the elements are radially...
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3786407 |
ACOUSTIC TRANSDUCER FOR DEEP SEA
An acoustic transducer which includes a piezo-electric ceramic element, one surface of which is exposed while the other surface is enclosed by a housing to form a static water pressure chamber, an...
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