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7598742 |
Externally guided and directed field induction resistivity tool
In one aspect an induction resistivity tool incorporated into a downhole tool string comprises an outer wall of a downhole component comprising an outer diameter and at least one induction...
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7595636 |
Apparatus and method of using accelerometer measurements for casing evaluation
A casing inspection device with magnets and flux sensors. Measurements of axial motion of the device are used to get better definition of the axial extent of casing defects. A contact device may be...
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7577544 |
Method and system for improving target localization and characterization
A method for determining a location and characterization of an object using a magnetic gradient tensor measurement of the object is provided. The method includes determining an object magnetic...
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7511503 |
Multiple electrode method and device for geoelectrical mapping of near surface layers
The invention a method and device for carrying out geoelectric mappings. The device includes electrodes, a power supply and a voltage measuring device, for carrying out the method. The electrodes...
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7439977 |
Method of displaying three-dimensional vector orientations on a two-dimensional surface
A method for generating, displaying and manipulating the orientation of three-dimensional vectors on a two-dimensional surface for visualization, statistical analysis and correlation. The method...
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7432715 |
Method and apparatus for metal detection employing digital signal processing
A metal detector employing digital means for the generation of highly quality reference signals used for transmission and demodulation and capable of continuously monitoring the parameters of the...
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7403013 |
Boring tool tracking/guiding system and method with unconstrained target location geometry
Tracking a boring tool is performed within an underground region using a locating signal. The boring tool is moved through the ground during a series of distance movements such that potential...
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7403000 |
Apparatus and method of determining casing thickness and permeability
A casing inspection device with magnets and flux sensors. The sensors provide measurements of absolute levels of magnetic flux that are indicative of changes in casing thickness and/or permeability.
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7397417 |
Electromagnetic impulse survey apparatus and method utilizing a magnetic component electromagnetic antenna
The invention relates to an apparatus and method for performing passive geophysical prospecting. More particularly, the present invention relates to an improved apparatus and method for locating...
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7375406 |
Thermoplastic overmolding for small package turbocharger speed sensor
A sensor package apparatus includes a lead frame substrate that supports one or more electrical components, which are connected to and located on the lead frame substrate. A plurality of wire bonds...
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7358739 |
Geo-storm generation apparatus and internal exploration apparatus using the geo-storm generation apparatus
A geo-storm generation apparatus includes a pair of coils disposed on a common center line with a predetermined interval, an electrode that is disposed between the pair of coils, an excitation...
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7342399 |
Magnetic anomaly sensing-based system for tracking a moving magnetic target
A system for tracking a moving magnetic target uses a magnetic anomaly sensing system to continually determine magnetic gradient tensors associated with the target and converts the magnetic...
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7276910 |
Compact self-tuned electrical resonator for buried object locator applications
A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the...
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7235970 |
Antenna core material for use in MWD resistivity measurements and NMR measurements
The present invention provides a novel use of a material having a high internal magnetostrictive damping and/or using material with explicitly low magnetostriction as an antenna core material for...
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7145456 |
Efficient electronics for a walk-through metal detector
A metal detection circuit that includes a power source and a connection to ground. At least one transmitter circuit is electrically coupled to the power source and ground and a transmit coil is...
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7126339 |
Utility iron golf club with weighting element
A golf club head comprising of a front plate integral with a primary body having a top, a sole, a rear portion, and a general periphery wherein the primary body and the front plate define a hollow...
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7106065 |
Method of geologic exploration for subsurface deposits
A method of geologic exploration for subsurface deposits includes the steps of: emitting energy below a surface of the earth; sensing a plurality of reactive electro-magnetic waves resulting from...
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7078905 |
Bore location system
A system and method for locating a horizontal bore below a ground surface includes a transmitting source configured to radiate from the bore a dipole magnetic field aligned with the bore. A...
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7072785 |
Rate measurement for anomalous trigger events
A method and apparatus for processing anomalous trigger event conditions to provide anomalous trigger event rate measurements. The apparatus operates to identify one or more trigger events in at...
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7038458 |
Magnetic anomaly homing system and method using rotationally invariant scalar contractions of magnetic gradient tensors
A magnetic anomaly homing system and method utilize an array of four triaxial magnetometer (TM) sensors coupled to a non-magnetic platform. The four TM sensors are positioned at the vertices of a...
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7031839 |
Multi-frequency focusing for MWD resistivity tools
An induction logging tool is used on a MWD bottom hole assembly. Due to the finite, nonzero, conductivity of the mandrel, conventional multi frequency focusing (MFF) does not work. A correction is...
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7026820 |
Method and apparatus for minimizing direct coupling for downhole logging devices
A method and apparatus for minimizing direct coupling between transmitters and receivers on a downhole logging tool are disclosed. One embodiment includes a transmitter, a bucking device, and a...
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6977505 |
Method for locating underground fluid sources
The present invention discloses a method for finding and analyzing underground magnetic anomalies. The method includes measuring magnetic signatures of the magnetic anomalies, interpreting the...
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6825775 |
Method and system for reducing interference
Method and systems for reducing effects of magnetic field interference that may interfere with a magnetic field signal generated at or near an underground object, where the magnetic field signal is...
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6819113 |
Precision grid survey apparatus and method for the mapping of hidden ferromagnetic structures
The present invention is for a precision grid surveyor having a stationary unit and a roving unit. The stationary unit has a light source unit that emits a light beam and a rotator to project the...
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6801136 |
Method of reducing noise in a borehole electromagnetic telemetry system
A method for reducing noise in borehole electromagnetic telemetry systems in which a signal receiver is positioned at a distance from a drill site borehole at which the signal receiver couples...
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6727827 |
Measurement while drilling electromagnetic telemetry system using a fixed downhole receiver
A system and method for enhancing the reception of electromagnetic (EM) waves in a fixed downhole receiver of an EM telemetry system is provided. In one embodiment, slots are formed in a portion of...
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6724192 |
Method and apparatus for exploration using GMR sensors
An instrument for geophysical measurement of magnetic field strength, using a GMR sensor is provided. The instrument achieves high sensitivity across a relatively wide bandwidth in an instrument...
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6683452 |
Magnetic flux density apparatus for, E.G., detecting an internal crack of a metal or a shape of the metal
A display apparatus of magnetic flux density for detecting an internal crack of a metal or a shape of the metal includes a three-dimensional magnetic flux focusing unit installed near the metal,...
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6586937 |
Magnetic signature detector for detection of magnetic buried targets
An apparatus for measuring and detecting a magnetic signature of a magnetically detectable object from a distance includes a portable sensor group for detecting the magnetic signature. The portable...
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6553326 |
Errors in systems using magnetic fields to locate objects
A process detects distortions to magnetic location or orientation determinations. The process includes measuring a plurality of magnetic field values, determining one of a probe's location and a...
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6529008 |
Electromagnetic induction coil sensor
An electromagnetic induction coil includes a casing with high magnetic permeability with a magnet disposed within the casing. The magnet has a central hole. A core with high magnetic permeability...
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6512356 |
Apparatus and method for determining electrical polarization of distribution of a vessel
Apparatus for determining the distribution of the electric polarization of a vessel in water, comprises an array of electric potential sensors ( 22 ) which are located in the water beneath the...
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6489771 |
Passive external noise-canceling dynamic magnetic flux sensor for detecting the presence and direction of movement of a pig in a pipe
An inductive magnet sensor has two identically wound magnetic antennae connected in series, out of phase, spaced axially from one another, and placed outside and parallel to the axis of a magnetic...
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6483309 |
Power frequency magnetic field (PF-MF) detection systems and operating methods therefor
The present invention provides a power frequency, i.e., time-varying, magnetic field (PF-NF) detector system for characterizing the operational condition of a remote facility responsive to...
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6476610 |
Magnetic anomaly sensing system and methods for maneuverable sensing platforms
A system and method for sensing magnetic anomalies uses a gradiometer having at least one pair of triaxial magnetometer-accelerometer (TMA) sensors. Each TMA sensor has X, Y, Z magnetic sensing...
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6466021 |
Deep underground imaging utilizing resistivity regularization for magnetotelluric processing
A method and apparatus for imaging deep underground objects utilizes the application of a spectral regularization routine that is applied to measured data prior to the application of an inversion...
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6449561 |
Induction logging
A method of providing a computed induction log of an induction logging tool run through an interval of a wellbore that extends through a layered formation invaded by wellbore fluid. The method...
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6411095 |
Apparatus and method for locating an object
The invention is directed to an apparatus and method for locating objects in a body through the mapping and imaging of the conductivity profiles of such objects by applying a force to the object...
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6304833 |
Hypothesis selection for evidential reasoning systems
A method for the selection of hypotheses for modeling physical phenomena, includes detecting if selected features are present by analyzing actual sensed data and parameter values of an initial...
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6304083 |
Magnetic field sensor with colossal magneto-resistive material contained within the coil of an oscillator
Sensors, systems and methods for measuring magnetic field strengths in both AC and DC magnetic fields by using CMR material in tunable, radio-frequency LC oscillators are disclosed.
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6255825 |
Method and apparatus for detecting, locating and resolving buried pipelines, cased wells and other ferrous objects
A method and apparatus are provided for surveying a given region for the presence of ferromagnetic items and other sources of magnetic field disturbance on or under the ground, such as pipelines...
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6229313 |
Mapping of pipeline grounding points by airborne or ground magnetic measurements of current flow in the pipeline
Apparatus for remotely determining the amount of current I flowing in a long, linear conductor, comprising a first sensor for measuring at a first location a magnetic field H arising due to current...
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6212476 |
Apparatus to measure the earth's local gravity and magnetic field in conjunction with global positioning attitude determining
A processor uses signals from at least two GPS receivers and a 3-component accelerometer located on a stable non-magnetic platform to determine the roll, yaw and pitch angles of the platform, thus...
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6201396 |
Apparatus for predicting earthquakes and other terrestrial events
A terrestrial change prediction apparatus including an indicator having a fixing member made of a nonmagnetic material and a plurality of magnetic bodies each having an N-pole end and an S-pole end...
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6191587 |
Satellite synchronized 3-D magnetotelluric system
A method of data acquisition for geophysical surveys. The method includes the steps of providing a least one magnetic sensor unit for sensing and recording magnetic field fluctuations; providing a...
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6150812 |
Detection of electromagnetic fields as a determinant of an event
Method and apparatus for detecting or analyzing chemical reactions, such as an enzyme reaction, and other events in which electron translation is accompanied by photon emission utilizing a...
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6144206 |
Magnetometer with waveform shaping
A detection apparatus discriminates between metallic mines and other buried objects by detecting the depth of the object, the size, the shape and the orientation of the object and the electrical...
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6124713 |
Matching amplifier having an extremely high input resistance for an induction probe
A matching amplifier for an induction probe which detects low-frequency alternating magnetic fields of floating bodies propagating in water. The matching amplifier has an isolating amplifier and a...
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6084413 |
Method and apparatus for detecting rock movement
A method and apparatus for detecting rock movement. The first step involves using at least one electromagnetic induction coil as a sensor. The second step involves monitoring changes in induced...
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