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| Number | Title | Issue Date |
| 7999551 | Method for detection of signal source using estimation of noise statistics A method for noise signal analysis and communication with an underground transmitter. The method comprises the steps of measuring a noise floor when no signal is transmitted from a transmitter, detecting a signal when the transmitter is transmitting, and estimating ... | 08/16/2011 |
| 7586309 | Apparatus and method for guiding energy in a subsurface electromagnetic measuring system A device for guiding energy in a subsurface electromagnetic measuring system is provided, the device including a transmitting member for transmitting an electromagnetic signal into a subsurface medium, an energy-guiding member disposed in magnetic communication with... | 09/08/2009 |
| 7328107 | Integrated earth formation evaluation method using controlled source electromagnetic survey data and seismic data A method for determining spatial distribution of properties of the Earth's subsurface includes obtaining seismic data over a survey area of the Earth's subsurface. Controlled source electromagnetic survey data are obtained over substantially the same survey area. An... | 02/05/2008 |
| 7286937 | Estimating formation properties from downhole data Methods and systems for extracting formation properties from formation logging data is disclosed. A method includes obtaining a deconvolution filter; and processing the formation logging data using the deconvolution filter to produce estimates of the formation prope... | 10/23/2007 |
| 7203599 | Method for acquiring transient electromagnetic survey data A method for controlled source electromagnetic Earth surveying includes deploying a plurality of electromagnetic sensors in a selected pattern at the top of an area of the Earth's subsurface to be surveyed. At least one of a transient electric field and a transient ... | 04/10/2007 |
| 7199748 | Positioning system for data aquisition The present invention refers to a positioning system, in particular for carrying out Georadar acquisitions, and more in particular of a 3-dimension type. In one embodiment, the positioning system for data acquisition using a data acquisition system includes at least... | 04/03/2007 |
| 7164123 | Method for filtering spurious resonances from an NMR dataset A method for filtering spurious resonances from an NMR dataset comprises the steps of: (a) creating a first, non-oscillating magnetic field of a predetermined field strength across a sample, (b) intermittently expo... | 01/16/2007 |
| 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 |
| 7042223 | Time domain electromagnetic analysis and inspection system for conduits A method of inspecting a conduit and a conduit inspection device are disclosed. The method relates to producing a primary magnetic field to induce a current in the conduit so that the currents produce a decaying secondary magnetic field influenced by the conduit. Th... | 05/09/2006 |
| 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 |
| 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 plurality of receivers, where signals may be directly coupled from the t... | 04/11/2006 |
| 6949930 | Time domain induction method and apparatus for locating buried objects in a medium by inducing and measuring transient eddy currents A method and apparatus locates buried objects in conductive soil by creating a direct current in a transmitting loop, periodically terminating the direct current in the transmitting loop to create an eddy current in the conductive soil using time domain induction, r... | 09/27/2005 |
| 6914433 | Detection of subsurface resistivity contrasts with application to location of fluids The invention relates to a method of mapping subsurface resistivity contrasts by making multichannel transient electromagnetic (MTEM) measurements on or near the earth's surface using at least one source, receiving means for measuring the system response and at leas... | 07/05/2005 |
| 6911826 | Pulsed eddy current sensor probes and inspection methods A pulsed eddy current sensor probe includes a sensor array board. A number of sensors are arranged on the sensor array board and are operable to sense and generate output signals from the transient electromagnetic flux in a part being inspected. Each of the sensors ... | 06/28/2005 |
| 6653838 | Ground mineralization rejecting metal detector (transmit signal) A metal detector with a transmit coil which transmits a magnetic field, transmit timing control circuitry, and receive signal circuitry and receive signal processing circuitry, and a low voltage and a high voltage power supply. The timing sequence generat... | 11/25/2003 |
| 6636044 | Ground mineralization rejecting metal detector (receive signal weighting) Metal detection apparatus wherein a transmit coil will transmit magnetic pulses, and the processing circuitry will weight a receive signal more heavily soon after a transmit pulse transition and less heavily after a longer period following the transmit pu... | 10/21/2003 |
| 6600320 | Apparatus with movable receiver coil array for locating a buried metallic object A unique time-domain electromagnetic system and data processing technique which, using low frequency electromagnetic fields, can localize, in three-dimensions, the position of buried metallic objects is disclosed. The measurement system uses time-domain e... | 07/29/2003 |
| 6573721 | Time domain electromagnetic analysis and inspection system for conduits An inspection system include a transmitter and a receiver configured for communication with a remotely positioned processing means. The transmitter and receiver are arranged as a mobile apparatus configured for insertion into any duct, conduit, pipeline, ... | 06/03/2003 |
| 6335624 | Process for electromagnetic detection of conducting objects A process is described to detect conducting objects buried in the ground by sending a series of electromagnetic pulses and the return signal. The signal characteristics stored in the database are sets of numerical data which each define characteristics of... | 01/01/2002 |
| 6326791 | Discrimination of metallic targets in magnetically susceptible soil A method is disclosed for discriminating electromagnetic responses of metallic objects in soil to application of an electromagnetic pulse from superposed responses due to magnetic susceptibility of the soil, comprising substantially eliminating, from at l... | 12/04/2001 |
| 6084412 | Imaging objects in a dissipative medium by nearfield electromagnetic holography A unique time-domain electromagnetic system and data processing technique which, using low frequency electromagnetic fields, can localize, in three-dimensions, the position of buried metallic objects is disclosed. The measurement system uses time-domain e... | 07/04/2000 |
| 6021373 | Back-up proximity sensor for a vehicle A back-up proximity sensor for a vehicle is formed with an array of sensor pairs. Each sensor pair includes a lower passive infrared sensor (PIR) having a first field of view and an upper PIR having a second field of view. Each lower PIR and upper PIR is ... | 02/01/2000 |
| 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 |
| 5498958 | Inductive proximity sensor with periodic switching for sensing the presence of objects An inductive proximity sensor determines if a metallic object is in close proximity. An inductor is placed near the object. Several switches control the direction of the voltage passing through the inductor. During a first time period, the voltage flows t... | 03/12/1996 |
| 5467018 | Method of processing transient electromagnetic measurements in geophysical analysis A method of geophysical analysis includes transmitting an electromagnetic signal into the earth and measuring the resulting transmission of that signal through the earth to a plurality of spaced recording units. The values of the transmitted signal are lo... | 11/14/1995 |
| 4894619 | Impulse induced eddy current type detector using plural measuring sequences in detecting metal objects The invention relates to a method and an apparatus for detecting metal objects in a metal detecting apparatus using impulse techniques. The metal detector comprises a compensation circuit arranged in between the transmitter system (13) and the receiver sy... | 01/16/1990 |
| 4837514 | Method of reducing noise in electromagnetic geophysical exploration data A method for reducing noise in electromagnetic geophysical exploration data simultaneously measures three orthogonal components of the ambient noise to produce noise records and simultaneously measures three orthogonal components of the decay of current i... | 06/06/1989 |
| 4600356 | Underground pipeline and cable detector and process An apparatus and process combining an excavation apparatus with a fully contained underground elongated conductive object detector capable of selectively detecting underground objects such as water pipes and electrical cables. The combination of this inve... | 07/15/1986 |
| 4595877 | Inductive loop system for detection of an electrically conductive object An eddy-current loop detector operates to sense the presence of an electrically conductive object by applying D.C. onto a conducting loop so that a permanent magnetic field is induced, which field partly penetrates into the object; ensuring the quick cess... | 06/17/1986 |
| 4544892 | Signal processing apparatus for frequency domain geophysical electromagnetic surveying system A frequency domain geophysical electromagnetic surveying system is provided in which intermittent primary fields having sharp terminations are generated in a cycle having a fundamental frequency by a transmitter, and a receiver includes a gate passing onl... | 10/01/1985 |
| 4535293 | Method for geophysical prospecting using impulsine currents In a method of geophysical prospection a transmitter dipole and a receiver dipole which is sensitive to an electromagnetic field are positioned in cooperation with the subsoil. An impulsive excitation current is applied repeatedly to the transmitter dipol... | 08/13/1985 |
| 4417210 | Method of geophysical prospection using transient currents In a method of geophysical prospection a transmitter dipole and a receiver dipole which is sensitive to an electromagnetic field are positioned in cooperation with the subsoil. An impulsive excitation current is applied repeatedly to the transmitter dipol... | 11/22/1983 |
| 4247821 | Transient electromagnetic prospecting apparatus possessing noise supression features A transient electromagnetic signal transceiver for use in geophysical prospecting includes cultural noise and random noise reduction features. AC mains interference signals are minimized by synchronizing the reception of TEM signals with the mains frequen... | 01/27/1981 |
| 4114086 | Inductive source method of induced polarization prospecting A method of geophysically prospecting a polarizable medium by measuring induced polarization effects wherein the medium is inductively polarized by a time varying current in an induction coil that varies with respect to time unidirectionally to maintain a... | 09/12/1978 |
| 3984759 | Apparatus for use in an induced polarization system for measuring the deformation of a periodic signal concealed in noise An apparatus for measuring the deformation parameters of a periodic signal concealed in noise. The signal is transmitted by a transmitter controlled by a stable clock and received by a receiver also controlled by a stable clock of the same frequency as th... | 10/05/1976 |
| 3950695 | Geophysical prospecting method utilizing correlation of received waveforms with stored reference waveforms A method of detecting conductive bodies in an area wherein a primary field having a complex waveform, such as a frequency modulated, rapidly swept signal is generated and is radiated toward the area. A receiving system is provided for sensing the primary ... | 04/13/1976 |
