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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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6064209 |
Apparatus and process for clearance of unexploded ordinance
A two-step process for clearing unexploded ordnance ("UXO") from the ground. First a high power electromagnetic transmitter sweeps the ground area to be decommissioned. Secondly a lower-power...
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6037776 |
Method and apparatus for geophysical 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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6031377 |
Magnetic anomaly detection buoy for detecting submarines
A magnetic anomaly detection buoy includes an elongated body having a cavity disposed therein, a means for detecting a magnetic anomaly and producing an output in response thereto, and a means for...
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6008641 |
Method using corrective factors for aligning a magnetic gradiometer
Inventive electrical-computational method and system for aligning a magnetic gradiometer, and for determining magnetic gradients using a magnetic gradiometer which is inventively aligned. For each...
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5942899 |
Hyperspectral radiometric mine detector based upon sensing microwave brightness temperature and interference contrast signatures
A passive mine detection apparatus useful for searching out buried mines, exploits natural soil emissions at microwave frequencies and unique interference-induced spectral reflection signatures...
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5917326 |
Guidance system for a moving person
The guidance system of the invention includes at least two spaced, permanently magnetized regions that each produce a magnetic field. The two permanently magnetized regions can be provided at...
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5892360 |
Probe carrier for detecting mines or other foreign objects which are close to the ground surface
A probe carrying vehicle is described which has at least one probe carrier which preferably carries at least one eddy current probe and at least one magnetic field probe for ground and foreign...
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5869967 |
Device for the detection of objects, especially explosive objects, lying in the earth
There is described a device for the detection of objects lying in the earth which, irrespective of topography, soil structure and state of the terrain, permits high surface yields with great...
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5825188 |
Method of mapping and monitoring groundwater and subsurface aqueous systems
An electromagnetic method is disclosed that can be used to map, track, and monitor subsurface water or solutions and related geologic structure including: groundwater, groundwater channels,...
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5821753 |
Method for obtaining magnetic dipole density image data of subterranean object
A method of processing magnetic field measurements to obtain magnetic dipole density image data is provided. The process involves making measurements of total magnetic field at a plurality of...
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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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5783944 |
Processing method for estimation of magnetizable object or source
A processing method that estimates the size and structural features of a magnetizable object or source from readings provided by an array of magnetic sensors. Using the method, an array of magnetic...
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5777477 |
Method of magnetic source localization using gradient tensor components and rate tensor components
Method and apparatus for localization and characterization of a magnetic rce including source strength and orientation. Samples of five tensor gradiometer signals from a straight-line track are...
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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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5770945 |
Seafloor magnetotelluric system and method for oil exploration
The magnetotelluric system for seafloor petroleum exploration comprises a first waterproof pressure case containing a processor, AC-coupled magnetic field post-amplifiers and electric field...
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5764061 |
Maritime apparatus for locating a buried submarine cable
A remotely operated submersible robot 10 is provided with two differential triaxial orthogonal dc magnetic sensing units, 1 and 2, each comprising two triaxial orthogonal dc magnetic sensors spaced...
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5764127 |
Inductive transmitters for conductor location
Two vertical, parallel, horizontally spaced signal coils are connected in series but in opposite phase across an a.c. source. Thus a buried conductor located centrally beneath the coils experiences...
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5745384 |
System and method for detecting a signal in a noisy environment
A system and method are disclosed for detecting an event-related signal among noise, where the system includes memory for storing measurement values and may include a processor for generating...
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5719501 |
Mine simulation system having an electromagnetic field disturbing device
A mine simulation system includes a magnetic field disturbance sensing apparatus carried by a moving vehicle and a plurality of randomly distributed passive permanent magnetic field disturbing...
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5670882 |
Ferrous target identification system with magnetic field polarity and gradient indication
A target identification system for detecting a desired ferrous object concealed beneath a surface is provided for a gradiometer. The system has first and second sensors for detecting a magnetic...
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5646533 |
Induction measurement in the presence of metallic, magnetic walls
A device for induction measurement of a medium adjacent a cylindrical, metallic, magnetic walled well of a well casing includes at least two magnetic circuits for magnetically saturating the...
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5642045 |
Magnetic field gradiometer with improved correction circuits
An improved magnetic field gradiometer having major and minor correction circuits is disclosed. The major correction circuits cancel the main components of an applied magnetic field, such as the...
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5629626 |
Apparatus and method for measuring buried ferromagnetic objects with a high accuracy of position and in synchronization with a sync pulse provided by a global positioning system
Apparatus and method for collecting magnetometer data at the earth's surface in order to detect anomalies in the earth's magnetic field caused by buried ferromagnetic objects. A plurality of...
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5626978 |
Method for securing a tester device to a battery and the battery so produced
A method for encasing a battery with a label containing an integral test circuit device that is thermally insulated from the battery and is activated by depressing a selected area of the label...
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5604049 |
Battery with tester label and method for producing it
A battery encased with a label containing an integral test circuit device that is thermally insulated from the battery by an expanded material and is activated by depressing a selected area of the...
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5585725 |
Magnetic detection of underground pipe using timed-release marking droplets
A system 10 and method of detecting an underground pipe 12 injects magnetic marking droplets 16 into the underground pipe 12 which coat the inside of the pipe 12 and may be detected from...
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5578926 |
Locating system for finding magnetic objects in the ground including improved means for accurate correlation of measured magnetometer probe signals to probe positions
The locating system for locating magnetic objects in the ground includes a series of position transmitters arranged at predetermined positions along a measurement path; a magnetometer probe movable...
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5570023 |
Portable station for measuring and adjusting the magnetic signature of a naval ship
The invention relates to a portable station for measuring and adjusting the magnetic signature of a naval ship making it possible to determine and/or modify the characteristics of the currents...
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5554934 |
Method and apparatus for locating a buried element of inductive material using probe with detector coils
After having used a known locator and a known transmitter of an electromagnetic field to find the general line of an element such as a pipe 14, the transmitter is kept activated and a probe is used...
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5543714 |
Three dimensional magnetic mapping process and apparatus with data filtering using an inverse computation
In a magnetic cartography process and apparatus, measurements are performed by magnetic field sensors placed in "fish" moved in the area to be mapped. Gradients are determined on the basis of the...
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5543246 |
Battery tester adhesive system
A system for bonding a condition indicator to an electrochemical cell is disclosed. The system employs an electrically conductive adhesive which bonds the indicator to a terminal of the cell. The...
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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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5444374 |
Method and apparatus for simultaneously collecting spatially and temporally varying magnetic survey data
A method and a device for implementing the method, for geophysical surveying of an area (1) including continuous measurement of the earth's magnetic and electromagnetic field using a detector (6)...
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5410252 |
Magnetic survey technique for determining subsurface environmental contamination
A technique for determining the extent of underground contamination within a test area involves recording of magnetic measurements at each of a plurality of test sites to generate magnetic test...
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5361675 |
Magnetic mine detonation apparatus
Apparatus for activating different types of magnetic trigger mechanism employed by different types of magnetic mine. The magnetic trigger activating apparatus includes apparatus for modifying the...
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5327089 |
Portable assembly for supporting magnetic and electrical sensors
A portable underwater mount for magnetic and electric field sensors. The mount has a gimbal-like structure comprising a ball member having a mounting flange for coupling to the magnetometer. The...
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5321361 |
Apparatus and method for detecting magnetically detectable plastic pipe and other sources of magnetic fields from a distance using a vertically aligned gradiometer on a horizontal support
An apparatus is disclosed for manipulation by an operator or user for detecting magnetically detectable plastic pipe and other sources of magnetic fields from a distance having a horizontally...
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5218300 |
Method and equipment for noise-reduction when detecting a target by means of a system of several detector elements
The detector elements are sensitive to the target presence in their respective vicinities and are distributed in the surveillance zone. First differences (S1-S2, S3-S2, S4-S2) are formed from...
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5184311 |
Method of operating an installation that comprises one or more long electrical conductors
The disclosed method of operating an installation that comprises one or more long electrical conductors (exemplarily an electric utility, telecommunication system or pipeline) involves receiving...
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5175500 |
Method and apparatus for surveying terrain resistivity utilizing available VFL electromagnetic fields
Terrain resistivity is mapped by collecting data as to the vertical magnetic field ratio along a survey line by VLF survey techniques, and precision integrating rather than differentiating the data...
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5142472 |
Method of measuring the resistivity and thickness of a thin underground layer using induction logging
A method used for determining true in-situ resistivity of a thin layer within a formation from dual induction log data. The method calculates true resistivity without the existing need: 1) for an...
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5138761 |
Method of manufacturing magnetic detection apparatus
A magnetic detection apparatus (magnetic locator) comprises a housing constituted by a first integral molded plastic unit and a second integral molded plastic unit that are joined. The first unit...
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5136245 |
Magnetic detection apparatus with sensors mounted on channel or angle cantilever support
A magnetic detection apparatus (magnetic locator) comprises a housing constituted by a first integral molded plastic unit and a second integral molded plastic unit that are joined. The first unit...
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5134369 |
Three axis magnetometer sensor field alignment and registration
An alignment process is applied to each sensor of an array of three axis magnetic sensors to electronically align the three axes of each sensor after the array has been deployed. The alignment...
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5122750 |
Methods employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables
In order to locate, trace, and identify hidden elongated objects, such as buried fiber optic cables, the objects are provided with elongated permanent magnet identifier devices having magnetic...
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5097211 |
Magnetic detection appartaus with plastic housing and sound-transmissive handle
A magnetic detection apparatus (magnetic locator) comprises a housing constituted by a first integral molded plastic unit and a second integral molded plastic unit that are joined. The first unit...
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5030913 |
Multiple sensor magnetometer with temporal noise rejection and controllable spatial response on a moving platform
A mobile magnetometry processing system which scans an area in order to mure the magnetic field strength over the area, comprising: a plurality of N sensors for sensing the magnetic field of the...
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5017873 |
Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables
In order to locate, trace, and identify hidden elongated objects, such as buried fiber optic cables, the objects are provided with elongated permanent magnet identifier devices having magnetic...
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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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