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7613075 |
Adaptive high frequency laser sonar system
An acoustic sensing device includes a housing having an internal cavity filled with a vibration decoupling medium. An acoustic window formed of an acoustically transparent material is mounted in...
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7554885 |
Polarization diversity for optical fiber applications
At least two light beams with polarization diversity are generated that each carry a representation of the same information. Separate optic fibers carry each of the at least two beams through a...
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7551517 |
Seabed seismic station packaging
A seismic sensor station includes a housing containing a fiber optic hydrophone and a fiber optic accelerometer that can both be made from a single length of optical fiber arranged inside the...
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7466631 |
Enhanced sensitivity pressure tolerant fiber optic hydrophone
An interferometric hydrophone operable for use in surrounding fluid, includes an outer mandrel having an interior open to the surrounding fluid. A sensing optical fiber is wound on the exterior of...
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7463555 |
Tri axis high frequency fiber optic acoustic sensor
A fiber optic acoustic sensor that detects pressure waves from all incident angles features multiple mandrels orthogonally disposed to provide omni-directional sensing capability. The topology of...
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7345952 |
Optical fibre sensors mounted on a cable
An optical sensor assembly including a coupler and an optical fibre coil. The coupler is attached to the central member of the cable at a position where outer layers of the cable been removed. A...
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7295493 |
Pressure tolerant fiber optic hydrophone
An interferometric hydrophone is disclosed that comprises a first mandrel defining an interior that is open to surrounding fluid. A sensing optical fiber is wound upon the first mandrel. A second...
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7283426 |
Method and apparatus for detecting submarines
A method for detecting, tracking and locating submarines ( 24 ) utilizes pulsed coherent radiation from a laser ( 12 ) that is projected down through a water column, with particles in the water...
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7281429 |
Optical hydrophone for a shock-wave field with long service life
An optical hydrophone for measurement of the acoustic pressure distribution in a fluid medium has a light source that illuminates an area of a boundary region between an optically transparent body...
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7260023 |
Remote underwater laser acoustic source
A method for generating an acoustic source in a liquid includes transmitting an optical pulse through the liquid so the optical pulse reaches I LIB through pulse compression and ionizes a liquid...
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7251196 |
Passive optical detection of underwater sound
A passive acoustic sensor that may be employed to detect sounds emanating from under the surface of a body of water. The sensor uses optics to determine vibration on the surface of a water body to...
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7239577 |
Apparatus and methods for multicomponent marine geophysical data gathering
In one embodiment the invention comprises a particle velocity sensor that includes a housing with a geophone mounted in the housing. A fluid that substantially surrounds the geophone is included...
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7227814 |
Repairable fiber optic hydrophone assembly
A re-enterable end-to-end hydrophone assembly which is at least partially transparent, so that the routing of the hydrophone fibers is visible during all phases of assembly and operation. The...
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7206259 |
Ultrasound sensor and ultrasound measurement device
An ultrasound sensor consists of an optical fiber having an active portion with high birefringence and two non-active portions located at each end of the active portion. A bragg grating is provided...
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7184368 |
Optical displacement sensor element
The invention relates an optical displacement sensor element comprising two essentially flat surfaces ( 1,2 ) being separated by a cavity defined by a spacer ( 5 ) and the surfaces ( 1,2 ), the...
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7149150 |
Underwater surveillance system
A plurality of sensing modules are deployed by positioning thereof in spaced relation to each other on a seafloor surface at a shallow depth to establish a targeted seawater zone within which...
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7139223 |
Deep water surveillance system
An elongated optical fiber is vertically positioned within seawater in a deep-depth targeted zone by vertical suspension thereof from a floating buoy. Electrode sensor arrays are positioned in...
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7132952 |
Security system for a portable article
The combination of a portable article and a security system. The security system has a flexible element/tether with a length. The flexible element/tether is connected between the portable article...
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7113447 |
Laser pumped compact acoustic sensor system
An acoustic transducer system for acoustic signals in water has at least one hollow spherically-shaped shell for vibrating in response to acoustic signals impinging from the water. The hollow...
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7082079 |
Pressure compensated hydrophone
A pressure compensated hydrophone for measuring dynamic pressures is disclosed. The hydrophone includes a compliant hollow mandrel with a single optical fiber coiled around at least a portion of...
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7027695 |
Fiber transition segment for use in optical fiber hydrophone array
A fiber transition segment for transitioning an optical fiber from a hydrophone module to the central axis of the module. The segment comprises a conical, elongated element and a cylindrical...
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6982925 |
Fiber-optic seismic array telemetry, system, and method
A method and system for interrogating a seismic sensor in a seismic cable having modular sensing stations spaced along the seismic cable and a connection module head end of the sensor sections,...
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6937778 |
Sensor arrays having light-powered transducers
A sensor array includes a plurality of sensor locations at which sensed signals are produced. A tension element holds locations at a given maximum spacing. The tension element includes an optical...
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6904222 |
Optical fiber splice protection apparatus for use in optical fiber hydrophone array
An optical fiber splice protection apparatus that allows optical fiber to be spliced and placed in position on a mandrel in cases of assembling a module or repairing optical fiber that has been...
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6882595 |
Pressure compensated hydrophone
A pressure compensated hydrophone for measuring dynamic pressures is disclosed. The hydrophone includes a compliant hollow mandrel with a single optical fiber coiled around at least a portion of...
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6879545 |
Woven fiber protection cable assembly for use in optical fiber hydrophone array
A woven fiber protection cable assembly for use in an optical fiber hydrophone module. The assembly comprises an elastic woven fiber strap with at least one tube attached to one or more sides of...
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6865334 |
Termination assembly for use in optical fiber hydrophone array
A termination assembly for use in an optical hydrophone module, comprising a module oil seal and an optical fiber seal. The termination assembly is used at the ends of modules and provides a means...
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6853604 |
Solid marine seismic cable
A support structure for piezoelectric elements in a marine seismic cable is provided. The support structure comprises upper and lower cylindrical halves, each with channels formed therein. Two...
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6825714 |
Multichannel interferometer with phase generated carrier demodulation and quadrature error correction
Apparatus for eliminating sign uncertainty in a coherent phase generated carrier demodulator in a multi-channel sensor system has a downconverter array arranged to separate the in-phase component I...
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6809991 |
Method and apparatus for detecting hidden features disposed in an opaque environment
An excitation signal is selected and transmitted, and a signal is received containing information produced by a remote object in response to the excitation signal. The information is evaluated to...
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6731570 |
Sound detection
Detection of remote acoustic signals is achieved using a pulse to pulse coherent laser beam which is projected from a telescope to a remote region that contains acoustic signals from a nearby...
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6728165 |
Acoustic sensing system for downhole seismic applications utilizing an array of fiber optic sensors
A system for sensing subterranean acoustic waves emitted from an acoustic source includes a plurality of laser sources, a plurality of subterranean optical sensors, at least one optical detector,...
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6693848 |
Apparatus for microchip laser geo-sensors
An optical geophone or hydrophone for detecting seismic vibrational energy comprising a laser material, which generates a lasing frequency signal, the frequency of which varies in accordance with...
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6678211 |
Amplified tree structure technology for fiber optic sensor arrays
A folded Sagnac fiber optic sensor array uses a common delay path to reduce distributed pickup in downlead fibers. The sensor array is used to detect perturbations (e.g., acoustic waves in water)....
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6667935 |
Apparatus and method for processing optical signals from two delay coils to increase the dynamic range of a sagnac-based fiber optic sensor array
A folded Sagnac fiber optic sensor array uses a common delay path to reduce distributed pickup in downlead fibers. The sensor array is used to detect perturbations (e.g., acoustic waves in water)....
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6661741 |
Optical hydrophone and array using bubble resonance for detecting acoustic signals
An optical hydrophone described herein includes a housing defining a chamber. The housing is acoustically transparent to acoustic waves at a frequency of interest. An optically transparent material...
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6628570 |
Laser velocimetry detection of underwater sound
An apparatus for determining the velocity of sound waves which includes a liquid medium having a plurality of gas bubbles. In the liquid medium, a laser transmits a light pulse to interact with the...
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6594198 |
Digital signal demodulator calibration system and method for optical hydrophones
A system for digitally demodulating optical hydrophone signals is provided. The system includes an optical hydrophone connected to an analog-to-digital converter and further connected to a digital...
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6549488 |
Fiber-optic hydrophone
There is provided a fiber-optic hydrophone having a compliant sensing mandrel coaxial with and adjacent to a rigid reference mandrel. A first optical fiber is wound around the compliant sensing...
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6529444 |
Folded sagnac sensor array
A folded Sagnac fiber optic acoustic sensor array operates in a manner similar to a Sagnac interferometer but uses a common delay path to reduce distributed pickup in downlead fibers. The fiber...
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6515939 |
Pulse sampled optical fiber hydrophone array (U)
An array through a first to a second side of a three-sided junction, accessed remotely by a single mode fiber transmits a light pulse sequence to the array and receives sound modulated return light...
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6466891 |
System for providing an estimate of the location of an undersea object
A system is disclosed that provides. a sonar operator with the most likely range to a target of interest. The system generates and displays a contour based on ship's parameters, target parameters,...
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6462808 |
Small optical microphone/sensor
The invention provides a small optical microphone/sensor ( 2 ) for measuring distances to, and/or physical properties of, a reflective surface, comprising a source of light ( 4 ) coupled to a light...
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6363034 |
Methods and apparatus for phase angle demodulation
An apparatus for phase angle demodulation. The apparatus functions as a highly-linear angle-modulation demodulator and is particularly useful for seismic streamers comprising very-large arrays of...
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6349791 |
Submarine bow dome acoustic sensor assembly
A submarine bow dome acoustic sensor assembly comprises an outer hull bow portion, an inner pressure hull wall extending athwartships and in conjunction with the outer hull bow portion defining a...
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RE37561 |
RF signal train generator and interferoceivers
New apparatus comprise a comprises an optical fiber based RF signal train generator for storing transient RF pulses and regenerating the identical replicas for analysis. The apparatus further ...
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6314056 |
Fiber optic sensor system and method
A system and method are provided for converting an electrical signal to an optical signal for a fiber optic system. The electrical signal produced by a sensor (10) based upon a parameter being...
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6307809 |
Geophone with optical fiber pressure sensor
A pressure sensitive optical fiber is enclosed within a pressure chamber. A mass is positioned so as to vary the pressure in the pressure chamber in response to a seismic signal. Variations in the...
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6298721 |
Continuous liquid level measurement system
A continuous liquid level measurement system is disclosed which is based upon a differential pressure measurement. The pressure of the liquid level to be measured is calibrated with a second...
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6292436 |
Underwater cable arrangements, internal devices for use in an underwater cable, and methods of connecting and internal device to a stress member of an underwater cable
An internal device for use in an underwater cable may comprise a body having an outer periphery, body being mountable inside the cable with the cable surrounding the outer periphery of the body....
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