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7629790 |
System for electronic detection of military threats
A system for the electronic detection of military threats includes an electromagnetic (EM) gradiometer for detecting secondary EM waves scattered from objects illuminated by a primary EM wave...
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7567869 |
Induction tool for detail evaluation of near borehole zone
Measurements made with an induction logging tool are processed to provide a resistivity model of fluid invasion of the formation. Up to five zones can be determined over a radial distance of about...
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7536262 |
Kalman filter approach to processing electromagnetic data
A method for tracking a sinusoidal electromagnetic signal in noisy data using a Kalman filter or other tracking algorithm. The method is useful for controlled source electromagnetic surveying where...
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7450053 |
Logging device with down-hole transceiver for operation in extreme temperatures
A logging radar system and method for measuring propped fractures and down-hole formation conditions in a subterranean formation including: a radar source; an optical source; an optical modulator...
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7411513 |
Weather warning system and method
A device for detecting a weather condition, particularly a tornado. The device includes a receiver module configured to receive electromagnetic signal from an atmosphere, particularly...
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7336079 |
Aerial electronic detection of surface and underground threats
An aerial electronic system for detection of surface and underground threats comprises an electromagnetic (EM) gradiometer flown aloft over the possible ground and underground threats to a convoy....
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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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7030617 |
System, apparatus, and method for conducting electromagnetic induction surveys
A method is provided for conducting an electromagnetic induction survey of a geological formation penetrated by a borehole lined with a conductive casing. The method includes positioning a...
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7012432 |
Induction logging antenna
An antenna assembly for an induction logging tool for use in a drilling operation. The assembly includes an outer pressure housing, a coil former within the pressure housing, magnetic cores mounted...
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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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6714153 |
Device for electromagnetic detection of geological properties in a well
The invention is a well radar for detecting, by electromagnetic wave reflection, resistivity horizons in production zones in oil wells. Transmitter and receiver antennas are combined in a tubing...
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6622093 |
Method and system for predicting rapid motion in earth's crust on basis of electromagnetic field observation
A casing pipe is inserted into a drilled hole reaching the inside of a confined aquifer in which groundwater is stored and flows or a position near the confined aquifer. A measuring device measures...
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6549012 |
Radio system for characterizing and outlining underground industrial developments and facilities
Most mines and underground facilities employ standardized construction techniques and materials. Such also cannot avoid having some above ground openings to receive utilities, fresh air, supplies,...
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6462549 |
Method and system for electroseismic monitoring of microseismicity
A method and system for determining the location of a microseismic event is disclosed. An electromagnetic sensor measures the electromagnetic energy which is caused by a microseismic event. Seismic...
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6414492 |
Method and apparatus for passive detection of geophysical discontinuities in the earth
An apparatus and method for passively determining physical characteristics of subterranean geological formation which for example bear oil or gas or commercial important ore deposits such as...
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6396433 |
Talking buried object detector
A spoken word-producing detector identifies objects by comparing signatures of detected objects with stored signatures of known objects. When the signatures compare, the detector produces stored...
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6373253 |
High-frequency electric field measurement using a toroidal antenna
A simple and compact method and apparatus for detecting high frequency electric fields, particularly in the frequency range of 1 MHz to 100 MHz, uses a compact toroidal antenna. For typical...
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6307375 |
Seismic activity predictor in proximity with the earth including a dielectric for receiving precursor seismic electromagnetic waveforms
A method of detecting precursor seismic electromagnetic waveforms and predicting future seismic activity in the form of an earthquake by placing a detector including a dielectric material in...
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6211807 |
System using spread spectrum modulation for locating underground objects
The location of underground objects such as pipes and conduits are located by detecting electrical signals emitted by the underground objects where the radiated signals include spread spectrum...
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6186006 |
Method for three-dimensional and non-destructive detection of structures
A method for nondestructive, three-dimensional detection of structural elements in structures, especially those made of concrete or similar materials, allows an area to be investigated to be...
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6087833 |
Passive geophysical prospecting apparatus and method based upon detection of discontinuities associated with extremely low frequency electromagnetic fields
An apparatus and method for passively determining the depth and thickness of a subterranean geologic formation bearing hydrocarbons, e.g., oil and/or gas, or commercially important ore deposits,...
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6018244 |
Method for detecting diastrophism by detecting VHF radio waves reflected by the ionosphere
A diastrophism detection method and an apparatus therefor are provided which is capable of predicting a position of occurrence of diastrophism such as an earthquake or the like, a scale thereof,...
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5903153 |
Apparatus and method for detecting underground liquids
A method and apparatus for detecting underground liquids is disclosed in which the electrical potential generated by a seismic shock is detected and measured with respect to a base point insulated...
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5811974 |
Tectonic activity monitoring equipment
The present invention relates to realize a tectonic activity monitoring equipment providing apparatus and method to detect a feeble electromagnetic wave occurred by the tectonic activity with a...
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5777476 |
Ground global tomography (CGT) using modulation of the ionospheric electrojets
An apparatus and method for performing geological mapping utilizes an HF transmitter to heat ionospheric electrons to cause the current in an overhead electrojet to be modulated, thereby injected a...
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5757177 |
Infrasonic frequency resonant circuit and method for use thereof
An infrasonic frequency resonant circuit and method for use thereof. An electric power distribution system is employed both as antenna for ISF signals and as a source of inductive reactance for a...
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5742166 |
Seismic activity predictor including a dielectric for receiving precursor seismic electromagnetic waveforms
A method of detecting precursor seismic electromagnetic waveforms and predicting future seismic activity in the form of an earthquake by placing a detector including a dielectric material in...
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5614908 |
Helicopter system with rotor blade antennas for landing assistance and for detection of electro-magnetic anomalies
A system for assistance in landing a helicopter and for the detection of electro-magnetic anomalies utilizing helicopter blades as carriers of receiving devices in a wide spectrum of...
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5521508 |
Method and apparatus for predicting the occurrence of an earthquake by identifying electromagnetic precursors
A method and apparatus for predicting the occurrence of an earthquake in a monitored area as described by detecting the vertical component of the Earth's magnetic field at a plurality of pairs of...
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H001524 |
Method for using electromagnetic grounded antennas as directional geophones
A method of seismic prospecting using electromagnetic grounded antennas to detect electromagnetic waves that are produced from acoustic waves in the earth's formation. Seismic waves reflected by a...
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5486764 |
Method for determining subsurface electrical resistance using electroseismic measurements
A method and apparatus for estimating the earth's resistance (conductivity) as a function of depth using electroseismic prospecting (ESP) or inverse ESP techniques. Resistance is determined by the...
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5438267 |
Single-switching method of eliminating the effect of electromagnetic coupling between a pair of receivers
The invention is directed toward the elimination of the effects of electromagnetic coupling between pairs of receivers. The preferred embodiment encompasses the measurement of resistivity and other...
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5387869 |
Apparatus for measuring transient electric earth current to predict the occurrence of an earthquake
An apparatus for measuring transient earth current includes a detection electrode and a second electrode disposed beneath the surface of the earth in vertical alignment with one another at depths...
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5148110 |
Method and apparatus for passively detecting the depth and location of a spatial or temporal anomaly by monitoring a time varying signal emanating from the earths surface
A method and apparatus for passively determining the depth of an anomaly using means for monitoring a broad spectrum of frequencies and analyzing the amplitude and modulation of a time and/or...
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5083124 |
Nuclear logging tool electronics including programmable gain amplifier and peak detection circuits
A method and apparatus for nuclear logging, and in particular, neutron porosity logging is presented. In accordance with the present invention, a novel programmable gain amplifier circuit and a...
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4996484 |
Method and apparatus for cancelling powerline noise in geophysical electromagnetic exploration
The present invention is used to cancel a narrow band noise of know frequency, such as 60 Hz noise generated by powerlines, in electromagnetic receiving equipment. A cancelling antenna is wrapped...
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4945310 |
Passive geophysical survey method based upon the detection of the DC component of the vertical electrical potential of natural earth currents
A geophysical prospecting method of measuring potentials existing in the air in the area of the lower atmosphere between about one and ten meters above the surface of the earth in order to detect...
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4931739 |
Meter for measuring the electric charge of a body
An apparatus for sensing the electrical potential of a positive electrostatic field which is primarily below the surface of the earth, and observing the changes in a series of each reading is...
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4904943 |
Method for detecting long waves and predicting earthquakes
A method for detecting earthquakes comprises the steps of picking up pre-earthquake long waves or earth currents at four or more observation points located underground or at the sea bottom,...
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4904942 |
Electroseismic prospecting by detection of an electromagnetic signal produced by dipolar movement
A method of electroseismic prospecting is disclosed for detecting either the presence of two immiscible fluids present in a porous subterranean formation or the presence of a high-permeability rock...
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4884030 |
Method and system for acquisition and separation of the effects of electromagnetic fields to predict earthquakes
The present invention relates to a system for acquisition and separation of the effects of simultaneous sources of electromagnetic field. According to the invention the system comprises an array of...
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4841250 |
Passive geophysical survey apparatus based upon the detection of the DC component of the vertical electrical potential of natural earth currents
A geophysical prospecting detector device and method of measuring potentials existing in the air in the area of the lower atmosphere between about one and ten meters above the surface of the earth...
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4837582 |
Method and apparatus for detecting electromagnetic waves generated by the earth's crust under strain
An antenna element such as a monopole, dipole or loop antenna is located in the earth or on the floor of the sea so as to receive pre-earthquake electromagnetic waves generated prior to the...
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4825165 |
Method and apparatus for detecting a transient phenomenon by monitoring variations of an alternating component of a vertical current emanating from the earth's surface
A method and apparatus for locating and evaluating surface and subsurface anomalies by detecting, monitoring or measuring transient or local variations respectively which occur in an alternating...
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4774469 |
Method of determining the mineral composition of ore bodies in rock mass
The method of geophysical prospecting of polymineral ore bodies including registering pulsed electromagnetic radiation generated by the ore bodies under the action of elastic waves excited in the...
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4724390 |
Non-superconducting apparatus for detecting magnetic and electromagnetic fields
The present invention relates to an apparatus for detecting magnetic and electromagnetic waves or fields through use of non-superconducting materials. The present invention relates to apparatus...
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4703278 |
Well logging disc coil receiving means and method
The present invention is a well logging receiver coil system which includes a coil. The system also includes a variable capacitor connected across the coil to form a resonant circuit tuned to a...
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4692905 |
Method for geophysical prospecting of complex orebodies
A method for geophysical prospecting of complex orebodies, wherein elastic waves are excited at least two times in the rock mass containing orebodies and the radio-frequency electromagnetic pulses...
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4692706 |
Well logging means and method for determining water saturation of a petroleum reservoir having two transmitters and two receivers
Method and apparatus determining the water saturation of a petroleum reservoir earth formation include transmitting electromagnetic energy in the earth formation from within a borehole traversing...
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4678997 |
Method and apparatus for dielectric well logging of subsurface earth formations with a lumped constant antenna
Method and apparatus for use in introducing electromagnetic energy into subsurface earth formations and acquiring measurements relating to propagation of such energy therethrough. A logging tool...
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