Matches 101 - 150 out of 177 < 1 2 3 4 >
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4993325 Magnetic field generator  
This invention discloses a magnetic field generator employing a direct cunt electromagnetic coil which is swept through a predetermined area by a drive motor and transmission means. Circuit means...
4980644 Earthquake detecting magnetometer with movable magnetic compass needle and method of using same  
An earthquake predicting magnetometer having a compass assembly with a graduated dial and an adjustbly positionable magnet assembly having magnetic poles oriented opposite the direction markings on...
4945309 Method of reducing impulsive noise in electromagnetic geophysical data  
A method for reducing impulsive noise in electromagnetic geophysical data utilizes a receiving antenna and one or more noise sensors. The type of noise sensor used depends on the type of impulsive...
4939460 Indigenous electromagnetic radiation based method for detecting geologic deposits  
A method for detecting a geologic deposit of a selected substance. In the method, the intensity of the local geomagnetic field at one or more measurement sites at a first location is resolved....
4906607 Sensor and method for indicating the presence of a low magnetic field using high critical temperature superconductor ceramic material to absorb electromagnetic energy  
A sensor and method for indicating the presence of a low magnetic field using high critical temperature superconductor ceramic material is comprised of a sensing element consisting essentially of...
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...
4837489 Magnetometer-based locator and identifier for ferrous objects having unknown shapes  
A ferrous object detector and locator includes a magnetometer sensor and a position sensor controlled by a microprocessor. The device accurately locates and identifies an unknown ferrous object and...
4792761 Geophysical prospecting with collimated magnetotelluric fields  
An electromagnetic survey system for geophysical exploration comprising a reconnaissance method and a survey line method. The reconnaissance method finds the principal electrical axis of...
4766385 Underwater buried mine classifier  
A magnetometer system carried aboard a tethered underwater vehicle for confirming the existence of a buried naval mine which then may be neutralized by an explosive charge dropped by the vehicle....
4757262 Method for geophysical exploration using electromagnetic array  
An electromagnetic survey method for geophysical exploration, in which the variations in the earth's magnetic field are measured in two, non-parallel directions at one point in the survey area....
4739262 Method for removal of bias difference between magnetometers  
A method for removing bias difference between two or more similarly operated magnetometers is disclosed wherein the inherent bias difference due to the magnetic field of the towing vessel is...
4727329 Method and system for measuring displacement of buried fluid transmission pipelines  
The vertical and lateral displacement of sections of fluid transmission pipelines due to earth subsidence or heaving is determined using vertical and horizontal arrays of magnetometer sensors...
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...
4719426 Method for magnetically detecting a localized disturbance of the ground  
The invention is predicated upon the fact that a buried object causes a disturbance of the local value of the earths magnetic field due to both the disruption of the soil and the material of the...
4675606 Magnetometers for detecting metallic objects in earth's magnetic field  
A passive system for detecting the position and trajectory of a moving body, moving in the air, on the ocean or below the ocean. This apparatus operates by detecting perturbations in the earth's...
4663593 Method of electromagnetic exploration  
A method of electromagnetic geophysical exploration of the earth's subterranean formations wherein an array of magnetometers are deployed at reference sites to obtain a measure of horizontal...
4653033 Goniotelemetry system  
A goniotelemetry system comprises two acoustic goniometers directed along two perpendicular axes taking measurements of angles at the intersection O of the two axii, as well as a triaxial...
4639675 Superconducting conductivity anomaly detection system  
A conductivity anomaly detection system uses a rotating superconducting met to generate a known source field and an integrated detection system rotating with the superconducting magnet to detect...
4574241 Marine surveying apparatus and method for locating pipelines buried under the seabed  
A marine pipeline surveying apparatus useful for locating buried pipelines includes a barge having a work deck with a dolly mounted on the work deck for movement on the deck upon a provided track....
4570122 Magnetic exploration with reduction of magnetic data to the equator  
A method of reducing magnetic data recorded at latitudes close to the magnetic equator to the equator is disclosed. The result corrects magnetic field anomalies recorded with respect to geologic...
4539522 Magnetic detector apparatus with liquid-supported, conductive, sensor-support tube  
Magnetic detector apparatus comprises a pair of electrically matched magnetic sensor assemblies supported at opposite ends of a titanium sensor tube of significant length. The sensor tube is...
4485345 Method and apparatus for conducting ground magnetic surveys  
A method and apparatus are disclosed for conducting ground or near ground magnetic surveys in which the magnetic field measurements of the earth's total field, a component thereof, or a combination...
4471219 Amplitude mode magnetic sensors  
A magnetic field sensor for detecting a magnetic field perturbation while nulling out variations in the signal caused by acoustic perturbations comprising a first and second optical fibers, an...
4458205 Geomagnetic prospecting method with measurements obtained during an internal of one to ten minutes time duration  
A geomagnetic prospecting system and method are disclosed to determine the presence of hydrocarbon-bearing substrata below the surface of the earth. A plurality of station sites are selected each...
4439732 Electrically balanced fluxgate gradiometers  
A gradiometer for measuring magnetic field gradients. The gradiometer is formed by a number of magnetic field sensing devices. Each device has its own axis of sensitivity and produces a signal...
4430613 Pipeline inspection and maintenance method including moving a magnetic field responsive device along the route of the pipeline  
A magnetometer is moved along the route of a pipeline and the output of the magnetometer is observed to identify pipeline characteristics. Used with a buried pipeline the magnetometer is moved over...
4427943 Apparatus and method for locating and tracking magnetic objects or sources  
At least one pair of vector gradiometers is employed to locate (and track) magnetic objects or sources. A first signal, S, is produced as a function of the difference in the absolute values of...
4393350 Method for rapidly detecting subterranean tunnels by detecting a non-null value of a resultant horizontal magnetic field component  
Method and apparatus for detecting tunnels, voids or other anomalies bene an area of the earth's surface wherein an oscillator couples a current into two conductors laid parallel to each other to...
4309659 Method for detecting a magnetic source by measuring the magnetic field thereabout  
A pair of magnetometer units symmetrically displaced from a reference measuring point along one axis and at least one magnetometer unit displaced from the reference point along a second axis...
4292590 Magnetometer apparatus with detector immobilized in wax  
A magnetometer assembly wherein a magnetometer detector suspended from a gimbal is immersed in a wax so as to immobilize the detector. Desired gimbal operation is achieved by heating the wax in the...
4288927 Terrestrial magnetism responsive method and device including a soft iron bar on a free end of a magnet  
A terrestrial magnetism responsive device adapted to be worked using a north or south seeking magnet in both north and south headings, the device including a housing having a north or south seeking...
4290020 Method and apparatus for detecting subterranean anomalies by generating two parallel magnetic fields  
Improved method and apparatus for detecting anomalies beneath an area of earth's surface wherein an oscillator couples a current into two conductors laid parallel to each other to generate two...
4258322 Electromagnetic subsoil prospecting process using an asymptotic low frequency range  
In a sub-soil prospecting process a vertical magnetic field transmitter dipole and a receiver dipole are placed on the ground, away from each other. The receiver dipole is oriented to detect a...
4229697 Magnetometer instrumentation with digitally controlled range changing  
Magnetometer instrumentation which processes the signals from an array of magnetometer assemblies wherein the need for multiple sets of motor driven resistors to change the gain of the signal...
4217699 Terrestrial magnetism responsive device and method for using north or south seeking magnets in both north and south headings  
A terrestrial magnetism responsive device adapted to use a north or south seeking magnet in both north and south headings, the device including a housing having a north or south seeking magnet...
4181879 Mine search coil simulator  
A passive inductor and associated circuitry which enables a compact search oil to simulate the response characteristics of a service mine search coil having different electrical properties. Output...
4165480 Prospecting system using rotating superconducting electromagnetic dipole  
A prospecting system uses a rotating superconducting electromagnetic source which is swept over a frequency range with a magnetometer type receiver sensing the induced field. The effective dipole...
4156178 Terrestrial magnetism responsive device including a pair of balanced north seeking magnets rotatable on a magnetic axis  
A terrestrial magnetic responsive device having a float carrying magnetic north-seeking means and responsive not only to magnetic north, but also to local magnetic force fields, said device having...
4110689 Magnetic detecting apparatus with novel means for positioning sensor assembly in a housing  
A magnetic locator in which flux-gate sensors are mounted in longitudinal notches at the ends of a tubular support to form an assembly which is inserted into a tubular housing, the sensors being...
4107607 Magnetometer using a field controlled oscillator, the oscillator core being maintained near its Curie point  
A magnetometer wherein inductance of a resonant circuit is made sensitive changes in magnetic field to vary an oscillator operating frequency. The magnetometer utilizes a ferromagnetic sensor...
4095169 Method for locating discontinuities in the electrical conductivity of the sub-soil using a plurality of magnetic detectors in a predetermined spatial arrangement  
A method and apparatus for investigating the electro-magnetic characteristics of the sub-soil. At least four and normally five directional magnetic field detectors placed on the ground. A first set...
4079309 Method for determining changes in earth resistivity by measuring phase difference between magnetic field components  
Method and apparatus for detecting tunnels beneath an area of the earth's rface wherein an oscillator couples a current into a linear conductor at the earth's surface to generate a magnetic field...
4021725 Mobile mine detection system having plural color display  
A vehicle carried metal object sensing system wherein sensing of magnetic elds of different polarity or of ferrous and non-ferrous objects results in distinctive colors on a cathode ray tube...
3971981 Magnetism detecting system  
A magnetism detecting system, in which reference magnetic fields sequentially scan many radial scanning lines obtained by dividing a plane to be detected at regular intervals of a desired angle...
3944912 Magnetic detection means for sensing mobile ferromagnetic masses including pulse shaper circuit for generating a single pulse output  
A device for detecting mobile ferromagnetic masses, notably of vehicles, comprising a magnetometric pick-up element of the type with orthogonal fields. The pick-up element is a ferrite tube of...
3943436 Line integral method of magneto-electric exploration  
A method of exploration for deposits of oil, gas and of other minerals in the earth including geothermal energy, which is based on the existence of electrotelluric currents that are generated...
3909704 Magnetic locator having sensor units with two-piece housings and tubular cores  
Magnetic locator employs improved flux-gate sensor units having a single elongated tubular magnetic core contained in an easily assembled, two-piece cylindrical housing. A signal winding wound...
3894283 Magnetic locator including sensors mounted in longitudinal grooves of a tubular support  
A magnetic locator in which flux-gate sensors are mounted in longitudinal notches or grooves at the ends of a tubular support to form an assembly which is inserted into a tubular housing, the...
3875497 Waterborne magnetic anomaly detection system and apparatus  
A detection system and apparatus is disclosed herein having a remotely controlled waterborne drone for towing a pair of separated, spaced apart magnetometers adapted to sense and detect submerged...
3858170 VIBRATOR PERFORMANCE MONITOR  
In geophysical prospecting where a number of earth vibrators are simultaneously used to inject predetermined seismic wave trains into the earth, electrical and mechanical malfunctions cause the...
Matches 101 - 150 out of 177 < 1 2 3 4 >