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| Number | Title | Issue Date |
| 8159904 | Force-feedback seismometer A broadband weak-motion seismometer includes: a frame, a mass, a suspension means for movably connecting the mass to the frame, a sensing transducer for measuring displacement of the mass with respect to the frame and for generating a sensing transducer output signa... | 04/17/2012 |
| 8085622 | Ultra low frequency acoustic vector sensor An acoustic vector sensor mounted in a housing is provided for measuring ultra low frequency acoustic wave particle velocities in a liquid, comprising a horn for amplifying the acoustic wave particle velocities, and a neutrally buoyant object supported in a liquid c... | 12/27/2011 |
| 7990806 | Seismograph system A seismograph system includes a seismometer, a positioning unit, a transmitter, a remote processing device. The seismometer includes a micro electromechanical system (MEMS) accelerometer and a MEMS gyroscope. The seismometer, the positioning unit, and the transmitte... | 08/02/2011 |
| 7684284 | Steering and fixed angle geophone The current invention minimizes the energy losses by pointing the geophone's internal system, which consists of a magnet bar, coil, and springs, towards signals reflected from targets. ... | 03/23/2010 |
| 7675821 | Deployment of seismic sensor An arrangement for the deployment of seismic sensor units, such as sensor nodes (24), on the seabed includes a frame structure that is adapted to carry a container (11) for containment of a data registration unit and additional auxiliary equipment for ... | 03/09/2010 |
| 7623414 | Particle motion vector measurement in a towed, marine seismic cable A particle motion sensor, includes: a sensing element capable of sensing a particle motion vector from a change in position thereof, and a packing material in which the sensing element is positioned, wherein the particle motion sensor is symmetric about its longitud... | 11/24/2009 |
| 7551519 | Passive long range acoustic sensor This Passive Long Range Acoustical Sensor relates to means of sensing acoustical sources and signals, including multi-channel acoustical signals, such as various types of sounds, vibrations, flutter, turbulence, and the like, and at long distances through a natural ... | 06/23/2009 |
| 7474591 | Six-component seismic data acquisition system A seismic data acquisition system includes a plurality of sensors which are arranged so they can be used to measure translation movements of a medium with three independent spatial components and of the rotation movements around each of the three independent spatial... | 01/06/2009 |
| 7443766 | Sensor assembly A sensor assembly includes a seismic sensor element and a shell. The shell at least partially surrounds the sensor element to shield the sensor element from a magnetic field that is generated outside of the shell. ... | 10/28/2008 |
| 7382690 | Method and apparatus for gathering seismic data In the present invention, a seismic receiver contains an onboard digitizer that samples and converts a signal from detected seismic energy into the digital domain. The receiver contains an analog to digital converter, a transmission circuitry, and a link to the seis... | 06/03/2008 |
| 7376049 | Seismic sensor with thermal stabilization A seismometer comprising a pressure sealed enclosure; an electrical component; an axis mechanics assembly having moving components, the axis mechanics assembly being in electrical communication with the electrical component; and a thermally insulating assembly mecha... | 05/20/2008 |
| 7367269 | Blast movement monitor and method for determining the movement of a blast movement monitor and associated rock as a result of blasting operations A method for measuring the movement of boundaries between different portions of a heterogeneous rock body is disclosed. The method comprises placing a plurality of blast movement monitors 109 in a rock body prior to blasting and noting the position of each bl... | 05/06/2008 |
| 7359057 | Method and apparatus for measuring small shifts in optical wavelengths A method and apparatus for detecting small shifts in optical wavelength is provided. Light having a known wavelength is directed towards a target volume in the atmosphere. Light reflected from the target volume is received and mixed with differentially delayed copie... | 04/15/2008 |
| 7343661 | Method for making condenser microphones A method for making condenser microphones includes: forming a fixed electrode layer structure of a plurality of fixed electrode units; forming a sacrificial layer of a plurality of sacrificial units on one side of the fixed electrode layer structure; forming a diaph... | 03/18/2008 |
| 7310287 | Method and apparatus for seismic data acquisition A marine seismic exploration method and system comprised of continuous recording, self-contained ocean bottom pods characterized by low profile casings. An external bumper is provided to promote ocean bottom coupling and prevent fishing net entrapment. Pods are teth... | 12/18/2007 |
| 7295494 | Diamagnetic current response transducer for sensing pressure gradient in a fluid medium A pressure gradient sensor for seismic and other applications utilizing the principle of diamagnetic drift. The sensor comprises at least one transducer, each transducer made of or containing a medium having at least one species of mobile charged particles such as e... | 11/13/2007 |
| 7292501 | Compact shooter localization system and method Systems and methods for locating the shooter of supersonic projectiles are described. Muzzle blast signals are neither sought nor required. The system uses at least two sensors, with each sensor having a 3-axis accelerometer. The sensors are spaced apart at least 1 ... | 11/06/2007 |
| 7292504 | Seismic sensors A method for compensating the effect of gravity on seismic sensors such as geophones and a gravity effect-free seismic sensor are disclosed. The gravity effect-free seismic sensor of the present invention includes primary sensor (100) operatively responsive t... | 11/06/2007 |
| 7284431 | Geophone An improved system for sensing ground motion is provided. The system generally comprises a shell and a case within the shell and connected by a suspension. The mass of the case is greater than the mass of the shell. An electrode within the shell detects relative mot... | 10/23/2007 |
| 7280436 | Miniature acoustic detector based on electron surface tunneling An electronic surface tunneling acoustic detector or microphone with very high sensitivity is disclosed. A tunneling tip is mounted on a rigid perforated suspension plate, along with control electrodes, which are used to move a conductive membrane suspended above th... | 10/09/2007 |
| 7274623 | Method and system for operating capacitive membrane ultrasonic transducers A novel operation regime for capacitive micromachined ultrasonic transducers (cMUTs). The collapse-snapback operation in which the center of the membrane makes intermittent contact with the substrate. This combines two distinct states of the membrane (in-collapse an... | 09/25/2007 |
| 7270640 | Massage device utilizing an unanchored magnet for primary force generation A therapeutic system for massage comprises a massage device having an activation cell comprising a hollow pocket at least partially filled with a ferro-magnetic fluid, a permanent magnet suspended in the ferro-magnetic fluid, a coil of electrically-conductive materi... | 09/18/2007 |
| 7254093 | Ocean bottom seismometer package with distributed geophones A seismic data collection unit having multiple separate geophones/geophone packages positioned in a housing wherein the geophones are offset from a vertical axis so that summing of the geophones' respective outputs minimizes certain noise in the unit's output. Speci... | 08/07/2007 |
| 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 within the housing. The particle velocity sensor has an acoustic impeda... | 07/03/2007 |
| 7224641 | Sensor arrangement and method for the installation and moving of this Arrangement for use for seismic surveys of geological formations in a seabed, where a plurality of such arrangements, which are provided with sensor units 26, are placed on the seabed for collecting pressure waves and shear waves reflected from the geological... | 05/29/2007 |
| 7210556 | Method and apparatus for installing a sensor array An apparatus and method is provided for transporting, installing, retrieving, and replacing a sensor array of individual sensor pods at a geographically remote location, such as on the sea floor. The apparatus consists of a remotely operated vehicle (ROV), a carouse... | 05/01/2007 |
| 7171853 | Magnetohydrodynamic (MHD) actuator sensor An MHD sensor/actuator is provided for generating torque as well as sensing angular displacements around a sense/torque axis. A column of conductive liquid which rotates within a circumferential channel having an inner circumferential surface and outer circumferenti... | 02/06/2007 |
| 7174023 | Automatic wind noise reduction circuit and automatic wind noise reduction method An object is to provide an automatic wind noise reducing circuit and an automatic wind noise reducing method, which are capable of coping with a multichanneling trend of audio signals, and improving performance as well as the degree of freedom in system design. Arit... | 02/06/2007 |
| 7169294 | Hydroprocessing catalyst and use thereof The invention pertains to a hydroprocessing catalyst suitable for the conversion of heavy hydrocarbon oils, which comprises 7–20 wt. % of Group VI metal, calculated as trioxide, and about 0.5–6 wt. % of Group VIII metal, calculated as oxide, on a carrier compris... | 01/30/2007 |
| 7137299 | Fiber optic accelerometer A proof mass is suspended in a cavity in a housing. The proof mass moves along a sensing axis in response to linear acceleration. Elastic support members are connected between the proof mass and the housing and are arranged to exert a reaction force on the proof mas... | 11/21/2006 |
| 7132958 | Downhole telemetry system using multiple uplink modes as data channels using discrete multi-tone modulation A method and a downhole telemetry system a downhole telemetry system using discrete multitone modulation for transmitting a data stream over a plurality of transmission modes is provided. The downhole telemetry system includes a downhole transmitter, a cable, and a ... | 11/07/2006 |
| 7101053 | Multidirectional retroreflectors Multidirectional retroreflectors and methods of reflecting light beams from multiple directions are provided. The multidirectional retroreflectors utilize a four-mirror retroreflector with a common virtual reflection point. ... | 09/05/2006 |
| 7085196 | Method and apparatus for gathering seismic data In the present invention, a seismic receiver contains an onboard digitizer that samples and converts a signal from detected seismic energy into the digital domain. The receiver contains an analog to digital converter, a transmission circuitry, and a link to the seis... | 08/01/2006 |
| 7079954 | Method for selective recording of SH waves using an array of sensors to filter out all non SH waves Selective recording of SH waves using an array of vector-summed sensors filters out all non-SH waves. ... | 07/18/2006 |
| 7073374 | Soil compaction measurement on moving platform An apparatus and method are provided for the in-situ measurement of the stiffness of a surface. The apparatus includes a platform, which is movable relative to the surface. A stiffness measurement device is supported by the platform in a stationary position relative... | 07/11/2006 |
| 7057974 | Device for sensing seismic and acoustic vibrations A device for sensing seismic and/or acoustic vibrations, has a body of a particulate material composed of a plurality of individual particles, and a system for determining changes in electrical conductivity of the particulate material caused by seismic and acoustic ... | 06/06/2006 |
| 7054228 | Sound source location and quantification using arrays of vector probes Method and apparatus for locating and quantifying sound sources using an array of acoustic vector probes (200). Signals received at the probes are converted to digital form and fed into a digital signal processor (400) which computes the sound pressure... | 05/30/2006 |
| 7035167 | Seismic sensor A seismic sensor, has a case, a pre-charged, non-conductive membrane located between two plates that form a capacitor and accommodated inside the case, with one of the plates being immovable relative to the case and the other of the plates being movable relative to ... | 04/25/2006 |
| 7030536 | Micromachined ultrasonic transducer cells having compliant support structure A micromachined ultrasonic transducer array comprising a multiplicity of cMUT cells built on a substrate. Each cMUT cell comprises a compliant support structure built on the substrate, a membrane supported over a cavity by the compliant support structure, a first el... | 04/18/2006 |
| 7016262 | Seismic sensor A seismic sensor, comprising a case, a pre-charged, non-conductive membrane located between two plates that form a capacitor and accommodated inside the case, with one of the plates being immovable relative to the case and the other of the plates being movable relat... | 03/21/2006 |
