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| Number | Title | Issue Date |
| 8030933 | Double-suspension receiver coil system and apparatus The present invention is a double-suspension receiver coil apparatus and system for conducting electromagnetic surveys including, both ground-based and airborne measurements. The present invention includes at least one receiver coil suspended by way of first suspens... | 10/04/2011 |
| RE42217 | Airborne electromagnetic time domain system 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 includes a transmitter section with a transmitter loop and a receiver se... | 03/15/2011 |
| 7830150 | Helicopter electromagnetic prospecting system An airborne electromagnetic prospecting system (10) is disclosed. The system (10) comprises a transmitter loop structure (12) hat is attached to, and arranged to be towed by, a helicopter (14). A transmitter (22) is fitted to the t... | 11/09/2010 |
| 7714584 | Gravity gradiometer The present invention provides a gravity gradiometer for measuring components of the gravity gradient tensor. The gravity gradiometer includes at least one sensor mass for movement in response to a gravity gradient and a sensor and actuator unit for generating an el... | 05/11/2010 |
| 7646201 | Airborne electromagnetic (EM) survey system An airborne electromagnetic survey system for conducting geological mapping is disclosed. A transmitter closed loop structure is used in the system and is designed for connection to a towing airborne vehicle. The transmitter loop structure comprises a plurality of i... | 01/12/2010 |
| 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 existent in a local area. A right magnetic dipole antenna and a left magne... | 12/08/2009 |
| 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 steps: taking first real time measurements from one, or more, geophysica... | 04/29/2008 |
| 7356411 | Method for acquiring and interpreting transient electromagnetic measurements A method for interpreting transient electromagnetic survey data includes measuring transient response of a medium over a plurality of switching events. The measured transient response to a first one of the current switching events is modeled. Transient response to t... | 04/08/2008 |
| 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. The EM gradiometer is disposed in a Styrofoam torpedo shaped pod that... | 02/26/2008 |
| 7333891 | Correction of cross-component induction measurements for misalignment using comparison of the XY formation response Measurements are made with a multicomponent logging tool in an earth formation. The measurements are inverted without using a selected cross-component measurement. The model is then used to predict the value of the selected cross-component. A misalignment angle of t... | 02/19/2008 |
| 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 images of a common spatial area in both visible and invisible bands ... | 11/20/2007 |
| 7268555 | Correction of cross-component induction measurements for misalignment using comparison of the XY formation response A multicomponent induction logging tool includes a transmitter antenna and two receiver antennas, one of which is aligned parallel to the transmitter. Using measurements made at a plurality of rotational angles, a misalignment angle between the transmitter antenna a... | 09/11/2007 |
| 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 frequencies are transmitted by a mobile transmitting antenna held stationar... | 08/28/2007 |
| 7241630 | Paramagnetic particle detection A method of determining the number of magnetic particles within a sample using a tuned circuit having a capacitor and a coil. The method comprises: a. determining the difference in the resonant frequency of the tuned circuit when t... | 07/10/2007 |
| 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 exploration system includes at least one non-directional, wideband, ... | 05/22/2007 |
| 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 the earth's surface. A processor receives the elevation slope, magneti... | 05/22/2007 |
| 7216740 | Rappelling rig A rig for use in conjunction with a helicopter or other aircraft which allows the aircraft to be quickly converted to use as a platform for rappelling. The rig is preferably constructed of strapping materials into relatively planar main body portion with attached le... | 05/15/2007 |
| 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 includes a transmitter section with a transmitter loop and a receiver se... | 01/02/2007 |
| 7053622 | Measuring equipment and method for mapping the geology in an underground formation The invention relates to measuring equipment and method for mapping the geology including a transmitter circuit with a current source for generating an electric current and a transmitter coil; a switch for connecting the current source to the transmitter coil during... | 05/30/2006 |
| 7038456 | Method and apparatus for determining the nature of subterranean reservoirs A system for detecting or determining the nature of a subterranean reservoir. An electromagnetic field is applied using a dipole antenna transmitter and this is detected using a dipole antenna receiver. The measurements are taken with the antenna both in-line and pa... | 05/02/2006 |
| 7035758 | Inspection system and method of inspection utilizing data acquisition and spatial correlation A method and apparatus for inspecting the outer surfaces of a building, structure, or vessel without placing at risk either people or large mechanical structures, or people and property at or near the base of the building, structure and vessel. The inspection is acc... | 04/25/2006 |
| 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 made to the induction logging data to give measurements simulating a ... | 04/18/2006 |
| 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 energy source. The exploration system includes a pair of aerodynamic ... | 02/21/2006 |
| 6943554 | Ionic current detection apparatus for internal combustion engine An ionic current detection apparatus for an internal combustion engine does not generate a false ionic current, and hence it does not generate a false knock component signal either, thereby avoiding an incorrect combustion determination or an incorrect knock determi... | 09/13/2005 |
| 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 typical pulsed EMI metal detector. The purpose of the calibration mode ... | 08/09/2005 |
| 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. Geophysical data is extrapolated from the tilt angles of the electromagnetic... | 04/05/2005 |
| 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 coil that emits a primary, multi-frequency component magnetic field ... | 03/22/2005 |
| 6845936 | Stable heli-borne vector platform for performing geophysical measurements A stable heli-borne vector platform capable of accepting a range of different sensors or instruments, particularly, but not exclusively, for the mapping and exploration of mountainous regions is described. The platform enables the arrangement of the sensors in three... | 01/25/2005 |
| 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 electromagnetic EM fields as an energy source. The magnetotelluric airborne s... | 07/20/2004 |
| 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 half-sinusoidal output waveform segments of a waveform havin... | 12/31/2002 |
| 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 having a signal source and an output side with a load compris... | 04/02/2002 |
| 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 the magnetizing head. The magnetization detected by the det... | 12/11/2001 |
| 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 mounted a receiving antenna may be towed by the towed airc... | 06/12/2001 |
| 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 flow, a second sensor for measuring at a second location ... | 05/08/2001 |
| 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 frequency and corresponding to a resonant frequency of the transm... | 08/18/1998 |
| 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.... | 07/22/1997 |
| 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 electro-magnetic fields with a predicted sensitivity and resolution far ... | 03/25/1997 |
| 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 beneath which lies the volume of material. A generator device ... | 03/11/1997 |
| 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, in the earth, by measuring at least one physical parameter... | 05/23/1995 |
| 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.... | 11/30/1993 |
