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8134432 |
Magnetically biased magnetopropant and pump
Provided is a system and method for enabling pressure or acoustic waves to induce magnetostrictive volume or shape change, providing greater control over magnetopropants. A coating material and the...
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8093869 |
Apparatus for generating electricity utilizing nondestructive interference of energy
A ferromagnetic material having non-zero magnetoelasticity, and/or nonzero magnetostriction is driven with vibratory mechanical energy at a frequency producing at least one resonant vibratory mode,...
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7893801 |
Magnetically biased magnetopropant and pump
Provided is a system and method for enabling pressure or acoustic waves to induce magnetostrictive volume or shape change, providing greater control over magnetopropants. A coating material and the...
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7881158 |
Seismic vibrator having multiple resonant frequencies in the seismic frequency band using multiple spring and mass arrangements to reduce required reactive mass
A seismic vibrator includes a transducer, a reactive mass, a base plate to couple motion of the reactive mass to subsurface formations and a linkage system configured to couple motion of the...
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7726193 |
Electromagnetic acoustic transducer with cross-talk elimination
The electromagnetic acoustic transducer (EMAT) transducer disclosed herein is useful for the non-destructive analysis of objects. The transducer comprises a core having a winding and a coil...
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7697375 |
Combined electro-magnetic acoustic transducer
A combined electromagnetic acoustic transducer (EMAT) is disclosed adapted to generate both SH-type acoustic waves and LAMB-type acoustic waves in a conductive casing, surroundings of which are to...
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7551518 |
Driving means for acoustic marine vibrator
A marine vibrator that in a particular embodiment includes a substantially elliptically shaped outer shell, a driver having a first and second end, at least one outer spring connected between the...
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7165453 |
Flexible electromagnetic acoustic transducer sensor
An array of magnets designed of flexible components and materials can be easily shaped to fit to the contour of various curved surfaces and structures. EMATs that incorporate these magnets, in...
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6600962 |
Sensor controller
A control system for controlling a variable of a device by an end element is disclosed. The control system has as its input a magnetostrictive position sensing probe for measuring the value of the...
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6272916 |
Acoustic wave transmission system and method for transmitting an acoustic wave to a drilling metal tubular member
An acoustic wave transmission system comprises an acoustic wave generating metal tubular member for converting information about the bottom of a borehole, which is obtained by a bottom hole sensor,...
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6188313 |
Device for generating sound
A device for regenerating powerful acoustic pressure comprises at least an arrangement for generating sound while utilizing the flextensional technique, i.e. having at least one surface element...
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6076629 |
Low frequency flextensional acoustic source for underwater use
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5812496 |
Water resistant microphone
A microphone for use in underwater applications. The microphone includes a dynamic magnet and coil assembly in a housing which incorporates a hydrophobic membrane. The membrane is sufficiently...
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5615172 |
Autonomous data transmission apparatus
A autonomous borehole data transmission apparatus for transmitting measurement data from measuring instruments at the downhole end of a drill string by generating pressure pulses utilizing a...
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5568448 |
System for transmitting a signal
A magnetostrictive element generates an ultrasonic wave and the generated ultrasonic wave is propagated through a propagation medium. An acoustic wave receiver receives the propagated ultrasonic...
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5550792 |
Sliced phased array doppler sonar system
A method and apparatus is disclosed for making a sliced phased array transducer formed from a single piezoelectric disk which has been bonded to a metal coated support surface. After bonding, the...
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5414397 |
Clamping device for magnetostrictive bodies
The invention relates to an elastic clamping device for at least one body with magnetostrictive properties, wherein a pressure force presses the clamping device against the inner magnetostrictive...
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5357232 |
Magnetostrictive element
A magnetostrictive element includes a magnetostrictive member, an outer magnet disposed coaxially about, spaced apart from, and surrounding the magnetostrictive member, and a soft magnetic yoke for...
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5355351 |
Underwater low-frequency sound producer using a rare earth alloy
An underwater low-frequency sound producer comprises vibrator units each including a magnetostrictive rod formed of a rare-earth alloy, a permanent magnet for providing a magnetic bias to the rod,...
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5329499 |
Acoustic transmitter
A drive package for acoustic transmitters includes a frame (6) of magnetic material with windows for accommodating driving members (20) and prestress devices (22) . Two windows with driving members...
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5132942 |
Low frequency electroacoustic transducer
This invention concerns a low frequency, high energy output electroacoustic transducer. It utilizes a vibratory unit formed of a stack of hollow ceramic cylinders about which is fitted a resilient...
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5103483 |
Spherical membrane omnidirectional loudspeaker using a magnetostrictive bimetallic strip
The invention concerns an omnidirectional loudspeaker. This loudspeaker comprises a spherical membrane which includes spires formed of a strip (2) made of a magnetostrictive material, the spires...
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5101384 |
Acoustic devices
A driving member for a diaphragm in acoustic devices includes a body with opposite recesses into which driving rods are inserted. One end of the driving rods is attached to pressure rods which...
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5070486 |
Process to increase the power of the low frequency electro acoustic transducers and corresponding transducers
An electroacoustic transducer according to the invention comprises a stacking of annular plates (13) made of piezoelectric ceramics alternating with annular electrodes (14) and pressed by an axial...
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5020036 |
Magnetostrictive transducer for logging tool
An acoustic wellbore logging tool transducer formed of a composite plate member having at least one plate of a magnetostrictive material which responds to a magnetic field to elongate or contract...
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4965778 |
Helical magnetostrictive core line hydrophone
A magnetostrictive flexible line hydrophone having a magnetostrictive elet which is an annealed nickel strip within a toroidal winding. Electrical wires are disposed inside the cylinder formed by...
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4907209 |
Low frequency sound transducer
A low frequency sound producer including a plurality of magnetostrictive vibrators arranged seriatim end to end to define a ring. Each vibrator unit includes a plurality of laterally related...
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4901293 |
Rare earth flextensional transducer
A flextensional transducer driven by magnetically biased rare earth rods 31. The rods 31 are arranged in stacks with rare earth magnets 34 mounted on each end of each stack for providing the bias...
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4866682 |
Transducer device
The present invention is directed to an ultrasonic device comprising a plurality of transducer elements arranged in rows and columns and acoustic insulation material maintained between each two...
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4864548 |
Flextensional transducer
An acoustic transducer for providing large displacements particularly at low acoustic frequencies is formed from a minimum of three curved shells which are attached to each other at their ends. The...
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4862430 |
Wide pass band elastic wave omnidirectional transducer
Wide pass band elastic wave omnidirectional transducer.It comprises a magnetostrictive material membrane (34, 36) provided with two electrical connections at two diametrically opposite points. The...
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4845688 |
Electro-mechanical transduction apparatus
An electro-mechanical spring which provides amplified motion as well as a compliant structure for attachment, at the locations of maximum motion, to other mechanical or acoustical loads or...
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4782471 |
Omnidirectional transducer of elastic waves with a wide pass band and production process
Omnidirectional, wide pass band, elastic wave transducer comprising a rigid magnetostrictive diaphragm, each surface element of the diaphragm constituting a unidirectional elastic wave transducer...
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4754441 |
Directional flextensional transducer
A directional flextensional transducer including a transducer shell capable of operation in odd and even drive modes and a transduction drive bar or the like. The transduction drive bar is excited...
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4716556 |
Magnetostrictive acoustic transducer
An acoustic transducer is provided that uses a layer of magnetostrictive ferromagnetic material having high magneto-mechanical coupling. The ferromagnetic material is adhered to a part of the outer...
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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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4700803 |
Transducer forming compression and shear waves for use in acoustic well logging
For use in acoustic logging, an acoustic wave transducer system forming both compression and shear waves is disclosed, the system having the preferred form of a plurality of radially directed...
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4642802 |
Elimination of magnetic biasing using magnetostrictive materials of opposite strain
The transducer of this invention provides a one-to-one input-to-output frequency relationship by the use of different magnetostrictive materials within the same transducer, the materials each...
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4641291 |
Phased array Doppler sonar transducer
A plurality of piezoelectric or magnetostrictive rectangular planar staves are held in side-by-side relation in a laminate assembly including insulative spacers. The widthwise polarity of adjacent...
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4636999 |
Magnetostrictive pulse generator
A magnetostrictive generator includes a magnetostrictive transducer having a vanadium permandur core and series connected primary and secondary windings, the secondary winding having more turns...
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4604612 |
Ice detector
An ice detector to detect a lyaer of ice on a thin solid sheet 14, such as the skin of an aircraft wing, even in the presence of water, comprises two ultrasonic transducers attached to the sheet....
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4541081 |
Electroacoustic transducer
An improved transducer for generating and receiving acoustic energy. A transducer core is constructed by bonding together a plurality of concentric cylinders to provide a ferromagnetic core. A...
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4443731 |
Hybrid piezoelectric and magnetostrictive acoustic wave transducer
The transducer is one that combines magnetostrictive and electrostrictive/piezoelectric transducer effects to form a transducer with improved performance. A transducer is provided which the two...
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4438509 |
Transducer with tensioned-wire precompression
A rod of magnetostrictive material has its ends placed between steel bars which provide compression on the rod by tensioning wires connected between the bars. Preferably, the wires are equally...
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4384351 |
Flextensional transducer
A magnetic drive is provided for a flextensional transducer in order to adapt the flextensional transducer for operation at increased ocean depths without the necessity of liquid filling and...
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4361879 |
Ferrofluid transducer
An underwater sound generator composed of a ferrofluid contained within a toroidal container which has a rigid bottom and top and elastic cylindrical side walls. A coil of wire links the toroidal...
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4308603 |
Ferrofluid transducer
A magnetic fluid transducer for producing a low-frequency sound field in a fluid medium. The device comprises a non-magnetic cylindrical housing with end windows. The housing is surrounded by a...
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4296486 |
Shielded electromagnetic acoustic transducers
Disclosed is an electromagnetic acoustic transducer, including a source of magnetic flux for establishing a static magnetic field, an electrical conductor for conducting an alternating current in...
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4223401 |
Broadband free-flooding magnetostrictive scroll transducer
A free-flooding, deep submergence cylindrical magnetostrictive transducer ving a plurality of identical, coaxial, ring-shaped scrolls, surrounded by a toroidal coil, the scrolls being vibration...
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4160231 |
Low frequency dipole hydrophone transducer
A dipole hydrophone which includes a radiation target for acoustic energy and a counterbalancing mass. A first multilaminar magnetostrictive arm is connected to the radiation target at its center...
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