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7301690 Micro-optical arrangement  
The invention relates to a micro-optical arrangement with which in particular optical properties of an optical element or its influencing of electromagnetic radiation may be changed. Thereby the...
7069795 Sensor using electro active curved helix and double helix  
Various sensors use an electro-active device ( 11 ) electrically connected to a detector circuit. The electro-active device ( 11 ) comprises an electro-active structure in the form of a continuous...
6784600 Ultrasonic membrane transducer for an ultrasonic diagnostic probe  
The invention is directed towards structures for use with micro-formed membrane ultrasonic transducers, and methods for fabricating the structures. In one embodiment, the transducer includes a...
6693849 Piezoelectric audio transducer  
A piezoelectric audio transducer suitable for underwater use comprises a piezoelectric ceramic plate within a housing having open front face and back faces exposing the front and back faces of the...
6495642 Process for preparing electrostrictive polymers and resulting polymers and articles  
Random copolymers including vinylidene fluoride and hexafluoropropylene that exhibit a large electrostrictive response when subjected to an electric field, articles including such polymers, and...
6160763 Towed array hydrophone  
An omni-directional dual bilaminar hydrophone particularly suitable for use in a towed array consisting of a cylindrical tubular housing whose ends are sealed by bilaminar piezoelectric...
6076629 Low frequency flextensional acoustic source for underwater use  
6002649 Tapered cylinder electro-acoustic transducer with reversed tapered driver  
A slotted cylinder transducer is provided having a cylindrical metal or cosite material shell. A cylindrical piezoelectric driver is bonded to the inside of the shell with an opening corresponding...
5889731 Vibration detector  
A vibration detector is disclosed. The vibration includes a ring (2) closed at its opposite ends by two ring ends (3, 4), that is externally covered with a sheath (11) made from an elastic material...
5856956 Piezoelectric acoustic transducer  
The piezoelectric-acoustic transducer of the present invention has a hollow case provided with a sound hole. A piezoelectric actuator is disposed inside this case that has one end fixed to the case...
5852589 Low cost composite transducer  
A composite sensor includes at least one layer comprising a piezoelectric material such as a molecularly poled polymer material or a ceramic material having disposed therebetween a material which...
5815466 Hydrophone structure with reverse bend of piezoelectric element  
An active element in a hydrophone includes a piezoelectric hydrophone crystal mounted to a backing plate. The piezoelectric crystal may be divided into separate segments. If so segmented, the...
5677894 Hydrophone structure with center pin  
An active element in a hydrophone includes a piezoelectric hydrophone crystal mounted to a backing plate. The piezoelectric crystal may divided into separate segments. If so segmented, the...
5572487 High pressure, high frequency reciprocal transducer  
A high frequency transducer capable of transmitting and receiving having an operational range from 100 kHz to 2 MHz, a free field voltage sensitivity (FFVS) greater than -218 dB re 1 V/μPa (300...
5406531 Low frequency flex-beam underwater acoustic transducer  
A low frequency flex-beam underwater acoustic transducer has a base, a flexible beam having one end cantilever mounted on the base, and piezoelectric driving means, for flexurally driving the beam....
5197041 Piezoelectric mud pulser for measurement-while-drilling applications  
A mud pulser for measurement-while-drilling applications is disclosed which employs piezoelectric transducers to provide for variations in the mud flow through a mud pulser sleeve. The...
5191559 Piezoelectric ceramic hydrostatic sound sensor  
A piezoelectric ceramic hydrostatic sound sensor or transducer having high ensitivity to hydrostatic pressure is made by placing a flat plastic disc between two flat layers of green ceramic...
5153859 Laminated piezoelectric structure and process of forming the same  
A method of forming a laminated piezoelectric structure is disclosed wherein a plurality of polarized piezoelectric films of vinylidene fluoride and trifluoroethylene are solvent welded together....
5136549 Marine hydrophone  
A hydrophone is provided for use with a hydrophone array enclosed in a streamer cable that is deployed in a body of water. The active transducer elements of the hydrophone are electrically isolated...
5099461 Underwater electroacoustic transducers  
The FLEXBAR is a sonar transducer element that is basically a piezoceramic "free-free" flexure bar, but modified so as to radiate as a "monopole" rather than as a "dipole", and retaining the unique...
5033032 Air-gap hydrophone  
A hydrophone for the detection of sound or vibrational waves, comprising a piezo electric transducer within a Faraday cage such that it is in contact with and yet isolated from a deformable...
5001681 Monolaminar piezoelectric bender bar  
A single stack of double poled piezoelectric ceramic elements (202) create a monolaminar bender bar (200) which can be used in acoustic applications. The stack is lined up such that adjacent...
4995014 Low frequency hydrophone and depth sensor assembly  
The housing of a transducer supports both dynamic and static pressure sensors to obtain depth information as well as pressure wave signals. A semiconductive diaphragm with diffused resistances...
4810913 Increased sensitivity piezoelectric hydrophones  
A hydrophone is provided having at least one flexible piezoelectric sensitive element applied to a support, each sensitive element being formed of a flexible piezoelectric film associated with two...
4782910 Bi-polar bender transducer for logging tools  
A bender acoustic transducer has a flat, piezoelectric element affixed to a flat, elongated inert element. The ends of the inert element are hinged on a supporting rectangular frame which has a...
4779246 Electro-acoustic transducer  
An electro-acoustic transducer has a transducer plate having a piezo-electric layer attached thereto. The electro-acoustic transucer is clamped between bearing members at an annular edge region...
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...
4742495 Acoustic energy transmitter for borehole logging  
An acoustic transmitter for borehole logging includes a flexure disc acoustic source affixed to one end of an open-ended pipe. A rubber boot surrounds the pipe and flexure disc source and fluidly...
4725994 Ultrasonic transducer with a multiple-folded piezoelectric polymer film  
An ultrasonic transducer includes a piezoelectric polymer film folded as at least two layers and having electrodes on both the surfaces thereof. The ultrasonic transducer is responsive to a signal,...
4709361 Flexural disk transducer  
A flexural disk transducer includes two thickness poled piezoelectric disks each of which is bonded on one side to a metal backing plate of substantial thickness and on the other side to a thin...
4694440 Underwater acoustic wave transmitting and receiving unit  
An underwater acoustic wave transmitting and receiving unit having excellent characteristics for both transmitting and receiving and providing stable characteristics over long operating periods. A...
4679178 Arrangement in hydrophone  
An arrangement in a piezoelectric hydrophone that is provided with a protective outer housing enveloping a waterproof closed casing (2). Said casing is provided with two mutually opposed and...
4536862 Seismic cable assembly having improved transducers  
A seismic cable assembly having an acoustically transparent tubular enclosure has at least one hydrophone electrically connected and positioned within the cable assembly enclosure. The hydrophone...
4516228 Acoustic well logging device for detecting compressional and shear waves  
A borehole logging system employs a compressional wave transmitter and a shear wave transmitter. The transmitters are alternately fired to impart compressional and shear waves into the formations...
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...
4326275 Directional transducer  
A directional transducer is disclosed which includes flexural disc transducer elements mounted by their periphery to an inertial mass and connected to the transducer housing by their centers.
4287582 Piezo transducers with mechanical amplification for very low frequencies, and acoustic antennas  
A new piezoelectric transducer incorporated with a mechanical amplifier is described. The transducer comprises a rigid base plate; two lateral plates whose lower edge is connected to the plate by a...
4188612 Piezoelectric seismometer  
A short period seismometer sealed in a housing with an oil-immersed frame supporting a mass suspended for displacement along an axis of sensitivity of the instrument, one end of the mass being...
4184093 Piezoelectric polymer rectangular flexural plate hydrophone  
A transducer, suitable for sensing acoustic signals underwater, includes a iezoelectric polymer film. The device comprises a rectangular sandwich arrangement with a plastic frame in the center...
4163206 Apparatus and method for seismic wave detection  
Seismic waves are detected for a given seismic prospect with an accelerometer and a hydrophone and the outputs of said accelerometer and hydrophone are combined directly to create a signal for...
4131874 Inertial balanced dipole hydrophone  
A dipole hydrophone which includes a piezoelectric bender bar having at the ends thereof two identical disks having high added mass and low actual mass, and a single mass at the center with low...
4081786 Hydrophone having a directive lobe in the form of a cardioid  
A hydrophone is disclosed which has a cardioid-shaped directional lobe for elective reception of acoustic waves. The device comprises a cylindrical casing having an acoustic window in a rear member...
4075600 Dual resonance bender transducer  
An acoustic transducer for simultaneously producing broadband sound sources n the conventional and overtone resonance modes. Two sets of ceramic and aluminum discs are fixed adjacent each other...
4031502 Hydrophone with acoustic reflector  
A hydrophone comprising an acoustical reflector constituted by a sealed, flexible and deformable container containing two rigid parallel plates separated by lattice sheets of interlaced filaments...
4010441 Flexion-plate hydrophones  
A hydrophone including a flexible membrane which is encased along its periphery within two rings. A piezoelectric disc is placed against each face of the membrane. The membrane, encasement, and...
3988620 Transducer having enhanced acceleration cancellation characteristics  
The specification discloses a pressure-sensitive transducer including two spaced pressure-sensitive subassemblies having matched parameters and which are electrically coupled together in a manner...
3970878 Piezoelectric transducer unit and hydrophone assembly  
A pressure-sensitive improved acceleration-cancelling hydrophone assembly and transducer unit for inclusion therein, each transducer unit being made of glass and metal parts hermetically sealed...
3879726 Audible alarm unit  
A piezoelectric transducer is carried in one of two compartments of a cup-shaped housing member with a printed circuit board assembly having an electrical circuit to energize the piezoelectric...
3832762 METHOD OF PRODUCING A MATCHED PARAMETER ACCELERATION CANCELLING HYDROPHONE  
A seismic cable having minimum response to speed changes is provided. The cable includes a plurality of miniature seismic pressure sensitive detectors coupled one to another in such a manner so as...
3708702 ELECTROACOUSTIC TRANSDUCER  
An electroacoustic transducer is described which is especially useful in telephones. An essentially flat frequency response curve in the voice range is realized by setting up a resonance peak in...
Matches 1 - 50 out of 76 1 2 >