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| Number | Title | Issue Date |
| 8174928 | Reducing a number of required channels for seismic sensors To reduce a number of required channels for a survey system having seismic sensors, the seismic sensors are partitioned into groups of corresponding seismic sensors. An aggregation unit applies different transformations of signals of the seismic sensors within a par... | 05/08/2012 |
| 8094516 | Method and device for the time-serial transmission of reception signals of electroacoustic transducers A method for the time-serial transmission of received signals of electroacoustic transducers (11), which are placed at different transducer locations (13) of a spatially spread receive arrangement (10), to a signal processing unit (12), i... | 01/10/2012 |
| 7948827 | Seismic data acquisition system A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin... | 05/24/2011 |
| 7356209 | Method and apparatus for optically powering and multiplexing distributed fiber optic sensors An optical power converting apparatus is provided that may be used with remote sensors. A plurality of remote sensors may be coupled to a backbone optical fiber with each sensor having an optical power converter that receives an optical signal from a head end of tha... | 04/08/2008 |
| 7348894 | Method and apparatus for using a data telemetry system over multi-conductor wirelines A data telemetry system for multi-conductor wirelines to enhance transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a first terminal of a data re... | 03/25/2008 |
| 7292943 | System and method for control of seismic data acquisition The present invention provides an interactive system for controlling seismic data acquisition. A central controller controls seismic sources, detectors and receivers. A user/operator is provided one or more views of the operational components over a graphical user i... | 11/06/2007 |
| 7269095 | Synchronization of seismic data acquisition systems A network distributed seismic data acquisition system comprises seismic receivers connected to remote acquisition modules, receiver lines, line tap units, base lines, a central recording system and a seismic source event generation unit synchronized to a master cloc... | 09/11/2007 |
| 7263245 | Method and apparatus for optically powering and multiplexing distributed fiber optic sensors An optical power converting apparatus is provided that may be used with remote sensors. A plurality of remote sensors may be coupled to a backbone optical fiber with each sensor having an optical power converter that receives an optical signal from a head end of tha... | 08/28/2007 |
| 7263030 | Seismic data acquisition system A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin... | 08/28/2007 |
| 7239579 | Seismic data acquisition system A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin... | 07/03/2007 |
| 7218890 | Seismic telemetry system A system for remotely controlling, acquiring and monitoring the acquisition of seismic data. The system includes remote equipment for collecting seismic data and for transmitting and receiving communication signals to and from a remote location. The system also incl... | 05/15/2007 |
| 7209407 | Seismic data acquisition system A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin... | 04/24/2007 |
| 7193932 | Seismic data acquisition system A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin... | 03/20/2007 |
| 7193931 | System and method for synchronous sampling and asynchronous transfer of data with connectionless powering and control of data link subsystems A system and method for measuring the value of a parameter, e.g. sound energy, at a plurality of spaced locations using electrically powered microcells positioned at each of the locations and for transmitting RF signals commensurate with control and measurement data... | 03/20/2007 |
| 7184670 | Telemetry system and method for acoustic arrays A telemetry system includes a plurality of acoustic sensors for receiving acoustic information and generating analog signals based on the received acoustic information. A first plurality of subsystems is coupled to at least a subset of the plurality of acoustic sens... | 02/27/2007 |
| 7158048 | Identically programmed intelligent electrodes for use in geoelectrical surveys Apparatus for conducting geophysical surveys comprising a multiplicity of intelligent electrodes provided on a multi-conductor cable, for receiving a command signal in response to which predetermined electrodes are connected to selected conductors in the cable. Each... | 01/02/2007 |
| 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 |
| 7026951 | Data telemetry system for multi-conductor wirelines An improved data telemetry system for multi-conductor wirelines to achieve satisfactory transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a firs... | 04/11/2006 |
| 6995683 | System and method for transmitting downhole data to the surface A system and method are disclosed that provide for transmitting data from a downhole location to the surface. In one embodiment, a communications medium provides data transfer capabilities to the surface. A first downhole instrument is associated with the communicat... | 02/07/2006 |
| 6996471 | Adding a signal to seismic data The present invention provides a method and apparatus for analyzing seismic data. The method includes determining a portion of the seismic data recorded substantially before the arrival of a seismic signal and adding a test signal to the portion of the seismic data ... | 02/07/2006 |
| 6969004 | Bar code symbol scanning system employing time-division multiplexed laser scanning and signal processing to avoid optical cross-talk and other unwanted light interference A laser scanning system that employs synchronous time-division-multiplexed laser scanning operations and signal processing operations. A plurality of successive non-overlapping time slots are defined and logically assigned to a unique laser scanning beam and corresp... | 11/29/2005 |
| 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 fiber. Light propagating on the optical fiber is applied to converters... | 08/30/2005 |
| 6910145 | Data transmission across asynchronous clock domains In one embodiment of the present invention, a system is provided for use in transmitting data and related control information from a first clock domain to a second clock domain. The system may include a first logic section that may generate respective identification... | 06/21/2005 |
| 6400646 | Method for compensating for remote clock offset A system is disclosed for synchronizing a clock in a well containing a drill string with a clock located near the surface of the well. The system includes devices for transmitting and receiving a pair of acoustic signals between locations associated with ... | 06/04/2002 |
| 6337636 | System and techniques for seismic data acquisition A data acquisition system has a central station connected to a plurality of nodes over a network. Each node is connected to receive signals from one or more sensors ad each is configured to have substantially the same transmission delay to said central st... | 01/08/2002 |
| 6002640 | Seismic data acquisition system A seismic data acquisition system is featured that utilizes a series of nearly identical seismic shots (SISS) to synchronize and to communicate with novel data acquisition units (NDAU) located in the field. Each SISS seismic shot is carefully timed to pro... | 12/14/1999 |
| 5978313 | Time synchronization for seismic exploration system A system and method for synchronizing collection of seismic data used for seismic surveys. In one embodiment, positioning signals received from a positioning system, such as the Global Positioning System, are used to acquire a highly accurate time value. ... | 11/02/1999 |
| 5583824 | Telemetry data transmission circuit having selectable clock source Disclosed is a telemetry data transmission circuit for a towed hydrophone streamer, the streamer comprised of a plurality of series-coupled modules. The transmission circuit comprises: (1) a slave clock input in a first module capable of receiving a maste... | 12/10/1996 |
| 5253219 | High count seismic data collection and transmission through analog time multiplexing A data collection and transmission system for gathering high count vertical seismic data is disclosed using a sequence of vertically aligned seismic receivers, the analog outputs from which are sequentially analog sampled and time multiplexed onto a commo... | 10/12/1993 |
| 5206835 | Modular device for reception, the acquisition and the transmission of seismic data with several multiplexing levels Modular device for the reception, the acquisition and the transmission, to a central control and recording unit, of signals picked up by a very large number of seismic acoustic receivers distributed along a streamer of great length under water in operatio... | 04/27/1993 |
| 5077698 | Method and device for the high-rate transmission of data following a quasi-asynchronous mode Method and device for the high-rate transmission of data between a multiplicity of acquisition apparatuses (Ai) and a central station to which they are connected by a common transmission channel (V1) for commands and by a high-rate transmission channel (V... | 12/31/1991 |
| 5062084 | Borehole digital geophone tool A method and apparatus for acquiring acoustical data from a borehole and is especially useful in carrying out tomogrphy surveys. The borehole digital geophone (BDG) tool of the present invention is capable of operating from a standard, 7-conductor logging... | 10/29/1991 |
| 5058080 | Multiple transmission path seismic telemetering system In a marine seismic data acquisition system, a plurality of seismic data transmission paths are utilized to conduct seismic data to a central recording unit from seismic data acquisition modules positioned along the length of cable. Signals from a plurali... | 10/15/1991 |
| 5051965 | Acousto-optical marine sensor array An acousto-optical seismic sensor array includes a distributed set of optical-fiber sensing coils. A light pulse is launched through the sensing coils in serial order. The light pulse is cumulatively data-modulated by the respective sensing coils and is r... | 09/24/1991 |
| 4967400 | Digital marine seismic system A digital marine seismic system employes a plurality of data acquisition control modules which simultaneously digitize analog seismic signals. The control modules also are selectably addressable in that each module is uniquely programmed to respond only t... | 10/30/1990 |
| 4808996 | Simultaneous digitizing apparatus for an acoustic tool For use in an acoustic logging tool, an apparatus which digitizes simultaneously obtained acoustic signals is set forth in the preferred and illustrated embodiment. The device cooperates with N acoustic receivers in a sonde. After an acoustic pulse is tra... | 02/28/1989 |
| 4787069 | Device usable for offshore seismic prospection for receiving seismic signals and transmitting them to a central control and recording system A two stage, decentralized device for transmitting seismic data information from seismic receivers of a seismic streamer to a central recorder on a ship, including a series of interconnected sections each having a plurality of seismic receivers distribute... | 11/22/1988 |
| 4684947 | Simultaneous digitizing apparatus for an acoustic tool For use in an acoustic logging tool, an apparatus which digitizes simultaneously obtained acoustic signals is set forth in the preferred and illustrated embodiment. The device cooperates with N acoustic receivers in a sonde. After an acoustic pulse is tra... | 08/04/1987 |
| 4663744 | Real time seismic telemetry system A real time seismic telemetry system includes a central station (10) for communication with a plurality of remote data acquistion units (14). The command station (10) has a command unit (34) for controlling the operation of a transmitter (40) for providin... | 05/05/1987 |
| 4639729 | Telemetric system In a two-stage, time-division multiplexing method and apparatus, a plurality of sensors are disposed at equal intervals along a plurality of transmission channels. An interrogation signal is transmitted from a recording station to all of the sensors along... | 01/27/1987 |
