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| Number | Title | Issue Date |
| 8134891 | Apparatus for generating a seismic source signal A seismic source signal generator having feed-forward control uses pressure, current, and/or valve position sensors to detect system component parameters. Initial and operating parameters are processed during source operation to remove, partially or wholly, harmonic... | 03/13/2012 |
| 7974154 | Vibroseis calibration technique and system A technique includes operating a seismic vibrator, including driving the seismic vibrator at different frequencies and driving forces. The technique includes monitoring a parameter affected by the operation of the seismic vibrator during the frequency sweep and base... | 07/05/2011 |
| 7929380 | Apparatus and method for generating a seismic source signal A seismic source signal generator having feed-forward control having pressure, current and/or valve position sensors that detect system component parameters. Initial and operating parameters are processed during source operation to remove, partially or wholly, harmo... | 04/19/2011 |
| 7859945 | Efficient seismic data acquisition with source separation A method for the simultaneous operation of multiple seismic vibrators using unique modified pseudorandom sweeps and recovery of the transmission path response from each vibrator is disclosed. The vibrator sweeps are derived from pseudorandom binary sequences modifie... | 12/28/2010 |
| 7382684 | Method for selective bandlimited data acquisition in subsurface formations The method for exploring desired characteristics of a subsurface sector, having at least one resonant frequency, is based on selectively transmitting suitable narrowband energy waves into the subsurface sector, thereby producing narrowband signals reflected off the ... | 06/03/2008 |
| 7364008 | System for imparting mechanical impulse energy to the ground The invention relates to an apparatus and method for imparting a precise amount of impulse energy to be delivered to the ground. The apparatus includes an anvil for operative deployment against the earth a hammer operatively connected to the anvil for striking the a... | 04/29/2008 |
| 7284636 | Accelerated weight drop for use as a seismic energy source and a method of operation thereof The present invention provides an accelerated weight drop for use as a seismic energy source, a method for operating an accelerated weight drop for use as a seismic energy source, and a seismic survey system including the accelerated weight drop. The accelerated wei... | 10/23/2007 |
| 7142140 | Auto scanning ADC for DPWM A system for monitoring interrupts to a processor includes a multiplexer having a plurality of inputs connected to receive various analog inputs. The multiplexer further has an output which is programmably connected to one of the plurality of inputs responsive to a ... | 11/28/2006 |
| 7081824 | Track monitoring equipment The alignment of railway tracks may be monitored using an accelerometer (36) mounted on a bogie (24) of a railway vehicle to detect lateral accelerations, and a displacement transducer (38) to monitor the lateral displacements of a wheelset (... | 07/25/2006 |
| 6975942 | Underground utility detection system and method Systems and methods provide for detection of one or more underground utilities. Radar waves and seismic waves of about the same wavelength are generated and communicated into a subsurface. Radar and seismic response signals resulting from communication of the radar ... | 12/13/2005 |
| 6460803 | System for control of active system for vibration and noise reduction An adaptive controller is used to adaptively generate vibration cancellation signals driving a controlled device which effects an associated vibration and noise-producing plant. The adaptive controller has multiple control paths to generate the control si... | 10/08/2002 |
| 5412623 | Multivibrator waveform monitoring system A multivibrator waveform monitoring system uses a plurality of seismic energy sources for giving vibrations to strata and a prospector, connected to a geophone, for measuring reflected vibrations. Each of the plurality of seismic energy sources includes a... | 05/02/1995 |
| 5410517 | Method for cascading sweeps for a seismic vibrator A method for cascading or linking seismic vibrator sweeps to form a cascaded sweep sequence. According to the method, a first cascaded sweep sequence is generated containing N sweep segments linked end-to-end. The N sweep segments are substantially identi... | 04/25/1995 |
| 5400299 | Seismic vibrator signature deconvolution A method for processing seismic vibrator data. The method utilizes a deterministic signature deconvolution of the vibrator data to compress the impulse response of the data resulting in sharper, clearer seismic images than are possible using cross-correla... | 03/21/1995 |
| 5331607 | Sweep frequency vibrator A sweep frequency vibrator is set forth. It has an elongate cylindrical housing closed at the top and bottom ends. On the interior, there is a reactionary mass fixed to identical upper and lower piston ends. They are received in seal isolated chambers, on... | 07/19/1994 |
| 5327399 | Multivibrator waveform monitoring system A multivibrator waveform monitoring system uses a plurality of seismic energy sources for giving vibrations to strata and a prospector, connected to a geophone, for measuring reflected vibrations. Each of the plurality of seismic energy sources includes a... | 07/05/1994 |
| 5128908 | Pressure feedback servovalve for a seismic vibrator An apparatus for reducing harmonic distortion and causing a more linear response in a hydraulic vibrator apparatus which generates a seismic signal into the surface of the earth is disclosed. The force developed in the actuator of a hydraulic vibrator is ... | 07/07/1992 |
| 5117926 | Method and system for controlling vibrations in borehole equipment Vibrations in borehole equipment are controlled by defining the energy flow through the equipment as the product of an "across" variable and a "through" variable, wherein fluctuations in one variable are measured and the energy flow is controlled by adjus... | 06/02/1992 |
| 4980874 | Method and apparatus for maximizing seismic shear wave production An apparatus and method for maximizing the shear wave energy imparted into the soil upon the impacting of a base plate by an impact mass from a seismic generator. A seismic generator is disposed at an angle relative to a line generally perpendicular to th... | 12/25/1990 |
| 4930113 | Suppression of air-coupled noise produced by seismic vibrators Air wave noise caused by a vibrating baseplate on a seismic vibrator is reduced or eliminated through active cancellation of sound. In active cancellation, the detection of acceleration of the baseplate is used to form a counterpart wave which is equal in... | 05/29/1990 |
| 4855967 | Seismic vibrator hold-down weight monitor/controller The disclosure relates to a seismic vibrator having an airbag isolator, a transducer for monitoring the instantaneous air pressure within the airbags, a summer to add the pressures within each air bag and a calibrated weighting network to convert the comp... | 08/08/1989 |
| 4821246 | Electromagnetic vibrator for seismic and civil-engineering applications An electromagnetic vibrator for seismic and civil-engineering applications is provided with a supporting structure fitted with a coupling element, and a reaction mass, which is to be caused to vibrate, with an electromagnetic drive associated therewith an... | 04/11/1989 |
| 4785431 | Broad-band hydraulic vibrator A hydraulic vibrator having an adjustable piston rod and a fixed piston rod to vary the cylinder volume for operation at different vibration frequencies. The adjustable piston rod is in threaded engagement with the fixed piston rod and has a piston head a... | 11/15/1988 |
| 4782446 | Vibrator quality control method and system A field quality control system and real-time method for evaluating the performance of swept frequency vibrators is provided. The system includes independent sensing means adapted to be mounted with the swept frequency vibrators for developing signals repr... | 11/01/1988 |
| 4779243 | Transducer array velocity sensor and processor system A differential transformer is used as a feedback sensor for generating an error signal sensed at the face of an element of a sonar transducing array. This error signal is used to correct the excitation signal to the transducer to correct both phase and am... | 10/18/1988 |
| 4766576 | Seismic source vibrator having improved sweep generator A sweep generator for a seismic source vibrator provides for any one of a variety of sweep signals governed by input parameters. Selected analytic functions may be entered which are solved to provide a plurality of sweep parameters. The sweep parameters m... | 08/23/1988 |
| 4751687 | Methods of reducing harmonic distortion in continuous wave seismic exploration Described is a method of driving a seismic vibrator with a control signal to produce an output signal having minimized harmonic distortion. The method includes the steps of producing a plurality a harmonic distortion signals related to a fundamental frequ... | 06/14/1988 |
| 4750157 | Seismic vibrator earth impedance determination and compensation system An earth impedance determination and compensation system for use with a seismic vibrator utilizes output signals from accelerometers on the baseplate and reaction mass portions of the vibrator to create a signal indicative of the near-surface weathered ea... | 06/07/1988 |
| 4723231 | Source tunable array for ground roll reduction A method of reducing Rayleigh waves (ground roll) in land seismic exploration employs a unique combination of amplitude output from and spacing of the vibrator sources making up a land seismic exploration system. The velocity of the Rayleigh wave for the ... | 02/02/1988 |
| 4706231 | Reaction mass acceleration feedback device An improvement for the drive control system of a vibratory sound source used in seismic exploration comprising apparatus for generating a feedback signal proportional to the instantaneous acceleration of the reaction mass structure of the sound source's h... | 11/10/1987 |
| 4692912 | Automatic force control for a seismic vibrator The present invention provides a method and apparatus for controlling the response of a seismic vibrator during its actuation period. The sweep input signal is modified in response to an average of the force applied to the earth by the vibrator over at le... | 09/08/1987 |
| 4670863 | Vibrator seismic source having adaptive distortion limiting control system A vibrator seismic source has a sweep generator for providing a pilot signal and sensors for generating a feedback signal representative of the force imparted to the ground by the vibrator pad. Circuitry is incorporated for separating the fundamental sign... | 06/02/1987 |
| 4654836 | Seismic vibrator source having improved phase detector A vibrator seismic source has a hydraulic system, including a pad, for applying reciprocating forces to the ground and sensor means for generating a feedback signal representative of the force applied to the ground. Circuitry is provided for generating a ... | 03/31/1987 |
| 4637002 | Seismic source vibrator having self tuning controller A self-tuning controller, for dynamic control of the servo valve and the actuator (mass, column, pad) of a seismic source vibrator, includes a state variable feedback network associated with a model reference for the servo valve and the actuator. The mode... | 01/13/1987 |
| 4616352 | Vibrator seismic source having distortion limiting control system A vibrator seismic source has a sweep generator for providing a pilot signal and sensors for generating a feedback signal representative of the force imparted to the ground by the vibrator pad. Circuitry is incorporated for separating the fundamental sign... | 10/07/1986 |
| 4567583 | Adaptive preset force level control for a seismic vibrator A seismic vibrator for shaking the ground is driven by an input sweep signal. A control signal, which is a function of the output force level of the vibrator, modulates the sweep signal to limit the output force level to a value that will prevent ground d... | 01/28/1986 |
| 4564927 | Method and apparatus for testing seismic vibrators A method of seismic exploration, wherein one or more vibratory sources are employed to generate an input signal whose frequency varies as a function of time and wherein the signal is reflected and refracted to detector stations from subsurface beds, in wh... | 01/14/1986 |
| 4538203 | Passive mass-spring type of sensing device having electronic damping A passive mass-spring type of sensing device or other such device for monitoring a particular parameter, for example mechanical vibration, is disclosed herein. This device utilizes an electrically conductive coil having a given impedance disposed within a... | 08/27/1985 |
| 4537077 | Load dynamics compensation circuit for servohydraulic control systems A load dynamic compensation circuit for a servohydraulic control system for fixtures and specimens being tested operating in various degrees of freedom, for example in an environment to simulate earthquakes to test building specimens, or to provide road p... | 08/27/1985 |
| 4519053 | Force or pressure feedback control for seismic vibrators A seismic vibrator source having an hydraulic vibrator coupled to vibrate a ground pad is provided with one or more force transducers such as, for example, load cells, strain gauges, or piezoelectric elements for measuring the force applied to the earth. ... | 05/21/1985 |
