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7542850 Method and system for synchronizing geophysical survey data  
A method and system for synchronizing geophysical survey data is provided. Detection of geophysically significant subsurface anomalies potentially associated with ore bodies or hydrocarbon deposits...
7365544 Methods of adjusting airborne geophysical measurements based on mapping instrument measurements  
This invention concerns a method of making airborne geophysical measurements. Such measurements may be made from fixed or moving wing airplanes or dirigibles. The method comprises the following...
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....
7298869 Multispectral data acquisition system and method  
A portable multispectral data acquisition system for use on a vehicle such as an aircraft comprises a plurality of gyroscope-stabilized remote sensing devices synchronized to simultaneously capture...
7262602 Active geophysical prospecting system  
An active system and method for determining the physical characteristics and geological composition of subterranean formations is described. Plane polarized electromagnetic waves at specific...
7222020 System and method for determining oil or mineral deposits  
A system and method determines the probability of oil or mineral deposits. At least one data collection device collects elevation slope, magnetic and gravity data sets for a predetermined area of...
7221164 Airborne remote sensing electric field exploration system  
An airborne exploration system used with an aircraft for exploration of oil and gas, mineral deposits and aquifers. The survey system uses natural electromagnetic EM fields as an energy source. The...
7157914 Airborne electromagnetic time domain system, computer product and method  
An airborne time domain electromagnetic surveying system is provided. The system includes a tow assembly with a flexible support frame. The flexible support frame spaced apart from the aircraft...
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...
7002349 Remote sensing electric field exploration system  
An airborne exploration system used with an aircraft for shallow and deep exploration for oil and gas, mineral deposits and aquifers. The survey system uses natural electromagnetic EM fields as an...
6927577 Digital nulling pulse inductive metal detector  
A method of improving pulse inductive metal detector sensitivity by minimizing adverse ground responses and transmitter coil transients is disclosed. The method provides a calibration mode for a...
6876202 System, method and computer product geological surveying utilizing natural electromagnetic fields  
A system, computer product and method for generating geophysical data is provided. At least one airborne sensor unit is provided which measures low frequency natural electromagnetic fields....
6870370 Electromagnetic induction detection system  
A airborne electromagnetic induction (EMI) detection apparatus and system. In accordance with one embodiment, the EMI detection apparatus includes a transmitter element in the form of a transmitter...
6765383 Magnetotelluric geophysical survey system using an airborne survey bird  
A magnetotelluric geophysical survey system used with an airborne survey bird for natural resource exploration of oil and gas, mineral deposits and aquifers. The survey system uses natural...
6501276 Frequency domain electromagnetic geophysical mapping instruments  
A frequency domain electromagnetic geophysical mapping instrument has a transmitter, a transmitter coil connected to the transmitter, the transmitter generating current pulse waveforms formed by...
6366074 Unidirectionality in electronic circuits through feedback  
A method for creating signal unidirectionality in electronic circuits is disclosed. This invention describes a method for achieving unidirectionality in an electronic circuit with an input side...
6329816 Method of and apparatus for measuring the thickness of a magnetic layer in a magnetic recording medium  
A measuring apparatus has a magnetizing head for magnetizing a magnetic layer of a specimen, and a detecting sensor for detecting a magnetization of a magnetized area which has been magnetized by...
6244534 Airborne electromagnetic system  
A towed aircraft for use in an airborne electromagnetic geophysical prospecting system which includes a transmitting antenna and power generating means for powering the antenna. A bird to which is...
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...
5796253 Time-domain electromagnetic geophysical mapping instruments  
In a time domain electromagnetic mapping technique of the type using transmitter pulses of half-sinusoidal waveform, with the half sinusoids being segments of a sinusoidal waveform having a...
5650981 Multi-vessel timing synchronization method and device  
This invention relates generally to a method and system for synchronizing the timing of events between and among vessels using a common timing reference.
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...
5610523 Method and apparatus of interrogating a volume of material beneath the ground including an airborne vehicle with a detector being synchronized with a generator in a ground loop  
A method of interrogating a volume of material beneath the ground. According to the method a transmitter is located to extend over and be supported by a surface area of ground encompassing and...
5417103 Method of determining material properties in the earth by measurement of deformations due to subsurface pressure changes  
This invention relates to a method of determination of the deformation of the surface or subsurface of the earth resulting from an applied pressure change at a selected point, at a selected depth,...
5266799 Geophysical survey system  
A geophysical survey system including a remotely piloted vehicle, a geophysical sensing payload mounted thereon and ground based control and data receiving means.
5119028 Method and system for determining the depth of an electrically conductive body in a medium having a known conductivity and a known permeability by measuring phase difference between a primary and secondary magnetic field  
A method and system for determining the depth of an electrically conductive body in a medium having a known conductivity and a known permeability. The method comprises the steps of generating a...
4864127 Earth surface hydrocarbon gas cloud detection by use of landsat data  
A method of locating potential oil and gas reservoirs in the earth utilizing a satellite equipped to receive reflected solar energy from the earth at at least one selected frequency band,...
4641100 Multifrequency method for direct airborne electromagnetic prospecting of hydrocarbon deposits  
A method for direct airborne electromagnetic prospecting of hydrocarbons by transmitting many primary electromagnetic fields and detecting any deviation of the primary electromagnetic fields due to...
4629990 Method and apparatus for correcting the relative motion of a transmitter and a receiver in airborne electromagnetic prospecting  
A method and apparatus for improving signals used for detecting conductive bodies in an area by means of an airborne electromagnetic survey system, comprising the steps of generating and...
4628266 Apparatus for direct airborne electromagnetic prospecting of hydrocarbon deposits.  
An apparatus for direct airborne electromagnetic prospecting of hydrocarbons by transmitting many primary electromagnetic fields and detecting any deviation of the primary electromagnetic fields...
4583095 Radar seismograph improvement  
The technologies of radar, exploration seismology, and air or space transportation, are combined to provide a highly-mobile and economical system of geophysical exploration for petroleum and other...
4535292 Transmitter for an electromagnetic survey system with improved power supply switching system  
A transmitter, to be used in an airborne or ground electromagnetic survey system for detecting conductive bodies in an area, said system being adapted to generate a frequency modulated signal and...
4506225 Method for remote measurement of anomalous complex variations of a predetermined electrical parameter in a target zone  
According to the method, a primary electromagnetic field, defined by a waveform of known shape and containing a plurality of frequency components, is directed towards a target zone. Signals are...
4492924 Method and apparatus for ore prospecting utilizing an aerial transmitter and aerial receiver  
The present invention relates to a method and apparatus for determining the electrical conductivity of the ground, particularly in connection with aerial prospecting, with the use of a transmitter...
4381544 Process and apparatus for geotechnic exploration  
A process for geotechnic exploration comprising the steps of: (a) Emitting one or more brief electromagnetic pulses or waves from an airborne platform at regular intervals based on the airspeed...
4367439 Airborne geophysical surveying system using multiple coil pairs  
The secondary signals induced in the receiver coils of two or three transmitter-receiver coil-pairs flown over terrain to be surveyed are combined to provide additional data relating to the...
4249129 Efficient simultaneous electromagnetic transmission or reception at different frequencies in electromagnetic mapping  
This invention relates to electromagnetic mapping wherein magnetic fields of two or three different and normally audio frequencies may be transmitted or received efficiently using induction coils...
4157579 Pulse generation employing parallel resonant LC circuit for energizing a coil with square wave  
A pulse generator for energizing a coil with periodic bipolar current pulses of predetermined aplitude, period and repetition rate and of generally square wave form. The coil to be energized is...
4100481 Hydrocarbon exploration with display of re-radiated and reflected microwave energy  
In the exploration for hydrocarbon gas, microwave energy is radiated from an antenna transported along a traverse above the surface of the earth. Microwave energy re-radiated from gas seeps is...
3960344 Precision mobile gravity survey and guidance system  
A gravity survey and aircraft guidance system comprises a pendulum clock mounted in an aircraft in level flight, having a pendulum bob with a signal sender mounted thereon. A signal receiver...
3872375 AIRBORNE ELECTROMAGNETIC PROSPECTING METHOD AND APPARATUS  
In a method of electromagnetic prospecting in which a transmitting coil and a receiving coil are moved along different parallel paths across a terrain, the coils are maintained in substantial...
3836841 ELECTROMAGNETIC DEVICE FOR DETERMINING THE CONDUCTANCE OF A NEARBY BODY BY A SINGLE SUPERCOOLED INDUCTOR COIL  
A towed electromagnetic prospecting device has a single inductor coil used for both transmitting and receiving secondary electromagnetic radiation from the ground which has been induced by the...
3828245 METHOD OF MAPPING BEDDING INTERFACES IN A PERMAFROST ZONE OF AN EARTH FORMATION BY ELECTROMAGNETIC RADIATION  
A method for accurately and quickly mapping the location of bedding interfaces in the permafrost zone of an earth formation from a movable vehicle, say an aircraft, by transmitting electromagnetic...
3795861 APPARATUS FOR ANALYSING TRANSIENTS IN A PERIODIC SEQUENCE OF SIGNALS  
In an apparatus for analysing transients in a periodic sequence of signals, a signal averager is used for averaging sequential portions of a repetitive waveform characteristic of a sequence of the...
3784899 METAL DETECTION SYSTEM  
In accordance with the present disclosure, the probability of the presence of metal in a predetermined region is determined by deriving representations of first and second antenna temperatures,...
3763419 GEOPHYSICAL EXPLORATION METHOD USING THE VERTICAL ELECTRIC COMPONENT OF A VLF FIELD AS A REFERENCE  
A geophysical exploration method and apparatus utilizing VLF fields produced by distant transmitters as a source of primary filed. The vertical electric alternating field component of the primary...
3753134 METHOD OF MAPPING PERMAFROST BY ELECTROMAGNETIC RADIATION TO INDICATE THICKNESS THEREOF  
A method for accurately and quickly mapping the thickness of the permafrost zone of an earth formation from a movable vehicle, say an aircraft, by transmitting electromagnetic radiation through the...
3741653 COMPUTER-AIDED LASER-BASED AIRBORNE MEASUREMENT SYSTEM  
In an airborne vehicle, a system having laser sources and optical tracking assemblies electrically communicating with a computer is provided for determining the absolute (inertial) path, position,...
3719882 RESONANT CIRCUIT APPARATUS FOR DETECTING ELECTROMAGNETIC CONDUCTIVE BODIES  
An apparatus for detecting the presence of electromagnetic conductive bodies comprises two coils which are coupled through a high gain, high impedance amplifier and tuning capacitor with the other...
3665466 DETERMINATION OF ICE THICKNESS  
The thickness of sea ice is measured using a radar technique with radio frequency energy having frequency in the range between a frequency below 2000 MHZ and a frequency above 4000 MHZ. The...
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