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| Number | Title | Issue Date |
| 7180053 | Apparatus, a system and method for determining a position within a cylinder An apparatus, a system and a method are provided for monitoring position of a machine element within a mechanical system and/or cleaning a machine element. A light source and sensor may be positioned within a cylinder. The sensor may detect the intensity of light wi... | 02/20/2007 |
| 6977505 | Method for locating underground fluid sources The present invention discloses a method for finding and analyzing underground magnetic anomalies. The method includes measuring magnetic signatures of the magnetic anomalies, interpreting the magnetic signatures to determine that the magnetic signatures are magneti... | 12/20/2005 |
| 6971464 | Driverless vehicle guidance system and method A vehicle guidance system for guiding a vehicle along a magnetic marker including a first magnetic sensor having a sensing axis, the first sensor measuring a first magnetic field. A second magnetic sensor has a sensing axis, the second sensor measuring a second magn... | 12/06/2005 |
| 6960912 | Magnetic field sensor device In a magnetic sensor device, a positioning element is provided with receptacles for receiving one magnetic field sensor element each. The positioning element and the magnetic field sensor elements are manufactured in a way that they fit exactly together so that the ... | 11/01/2005 |
| 6961605 | Method for processing biomagnetic field data, magnetic field contour mapping, forming their waveforms and a biomagnetic instrument using the same A method for processing biomagnetic fields generated by biocurrents resulting from activities of human brain or myocardia and its mapping apparatus are provided, which features biomagnetic measurement and its analysis, magnetic field mapping and its imaging and thei... | 11/01/2005 |
| 6954685 | Aircraft vehicular propulsion system monitoring device and method Methods and systems for monitoring rotating shaft shafts and couplings in an aircraft propulsion system is described. The measurement system/method provides for accurate and precise monitoring of a rotating shaft flexible coupling in a fixed wing aircraft vehicle pr... | 10/11/2005 |
| 6396263 | Devices and methods for mapping complex magnetic fields through discrete magnetic potential measurements A magnetic potential mapping device is provided by placing a planar polarized light source near an optically active fiber element traversing a magnetic field, so constructed that rotating planar polarized light is transmitted through the optical fiber and... | 05/28/2002 |
| 6336043 | Method for processing biomagnetic field data, magnetic field contour mapping, forming their waveforms and a biomagnetic instrument using the same A method for processing biomagnetic fields generated by biocurrents resulting from activities of human brain or myocardia and its mapping apparatus are provided, which features biomagnetic measurement and its analysis, magnetic field mapping and its imagi... | 01/01/2002 |
| 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 correlation of a correction magnetometer's vector with a r... | 12/28/1999 |
| 5990679 | Method using corrective factors for determining a magnetic gradient 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 correlation of a correction magnetometer's vector with a r... | 11/23/1999 |
| 5761094 | Vehicle compass system A vehicle compass system having a magnetic field sensor coupled to a processing circuit which samples the sensor data and implements a calibration routine that generates compensation signals to compensate the sensor for the effects of vehicular magnetism ... | 06/02/1998 |
| 5755227 | Method and apparatus for deducing bioelectric current sources A method and apparatus for deducing physical quantities such as positions, sizes and orientations of bioelectric current sources. Minute magnetic fields formed by the bioelectric current sources in a region under examination of an examinee are measured wi... | 05/26/1998 |
| 5654635 | Method and device for simultaneous identification and correction of errors due to magnetic perturbations and to misalignments in the measurements of a magnetometer The present invention relates to a method and to a device (1) for correcting measurement errors of a magnetometer (2) mounted on a vehicle (3). According to the invention: a theoretical corrective model [A].Hm+a.Hm'+Hp=[M].H is defined, in which [A], a an... | 08/05/1997 |
| 5307072 | Non-concentricity compensation in position and orientation measurement systems A method and apparatus for determining the position and orientation of a remote object relative to a reference coordinate frame includes a source having a plurality of field-generating elements for generating electromagnetic fields, a drive for applying, ... | 04/26/1994 |
| 5287295 | Method and apparatus for calibrating an electronic compass to account for alignment errors in the compass windings An electronic compass (10) having at least two sense windings (11, 12) is mounted in a vehicle. The outputs (x(h), y(h)) of the windings are measured for a number of compass directions (headings). From this data an error difference angle ($c;), from a ... | 02/15/1994 |
| 5161311 | Calibration and compensation of an electronic compass system An electronic compass for use in a vehicle includes compensation for attaining a high degree of accuracy without operator intervention or the need to drive the vehicle in a deliberate circular path. An automatic method for accurately determining maximum a... | 11/10/1992 |
| 5151649 | Pair of electrically shielded triaxial magnetic sensors for determination of electric currents in conductors in air with distance and angle compensation Two groups of magnetic field transducers shielded from electric fields and at a known distance from each other are contained in a portable instrument. Each group consists of 3 magnetic field transducers each sensitive to the magnetic field at a single poi... | 09/29/1992 |
| 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 process compensates for each sensor not being aligned perfectl... | 07/28/1992 |
| 5115197 | Fluxgate sensor having adjustable core extending beyond a coil winding and a gradiometer incorporating a pair of sensors A fluxgate sensor has a coil body defining a bore and an axis. A coil is wound on the coil body around the axis. A ferromagnetic core is located in the bore and extends beyond either end of the coil, to improve the sensitivity of the sensor. The core may ... | 05/19/1992 |
| 5046031 | Method and apparatus for automatic flux-gate compass calibration A system for automatically compensating for changes in permanent magnetism in a vehicle in which a flux-gate compass is installed. Calibration is initially performed by rotating the vehicle through a full circle and determining from the flux-gate outputs ... | 09/03/1991 |
| 4977896 | Analysis of biological signals using data from arrays of sensors Signals produced by brain activity are measured by each sensor of an array of magnetic and/or electrical sensors external to but proximate to the head (or other portion of the body) of a subject. The measurements obtained simultaneously from all of the se... | 12/18/1990 |
| 4870602 | Method for determining route angles A method for the determining route angle and for automatically calibrating course accuracy with a three-axis magnetometer fixed to an aircraft despite the presence of interfering vehicle magnetic fields and instrumentation errors. The method is accomplish... | 09/26/1989 |
| 4806865 | Device for measuring the earth's magnetic field disturbed by anomalies A device is provided for measuring the earth's magnetic field disturbed by anomalies, including a probe in which are mounted, aligned and harmonized with each other, a nuclear magnetic resonance measuring probe associated with its oscillation electronics ... | 02/21/1989 |
| 4797841 | Method and apparatus for automatic calibration of magnetic compass A three winding induction compass mounted in a host vehicle has each winding output coupled to an analog to digital converter. Each winding output is weighted and accumulated by a push down stack circuit to obtain a time filtered output; the filtered outp... | 01/10/1989 |
| 4731582 | Method and apparatus for correcting alignment errors in a magnetometer system A process for automatically correcting alignment errors between the measuring magnetometers of a magnetic gradient meter, consists in adding to such a gradient meter two additional magnetometers perpendicular to each other and to the axis of the measuring... | 03/15/1988 |
| 4722057 | Method and apparatus for reduction of the magnetic identity for ship parts which are movable for their bearing and elevation The present invention relates to a method and an apparatus for the reduction of the magnetic identity for such ship parts, primarily ship's guns, the aiming, fire control and possibly firing of which are controlled by a computer. The computer is used to c... | 01/26/1988 |
| 4623842 | Magnetometer array with magnetic field sensors on elongate support A fluxgate magnetometer with a linear array of three sensors equi-spaced along a support beam and accurately adjustable into the same spatial orientation for sensing magnetic field anomalies and/or for measuring a single axis component of a magnetic field... | 11/18/1986 |
| 4611293 | Method and apparatus for automatic calibration of magnetic compass A three winding induction compass mounted in a host vehicle has each winding output coupled to an analog to digital converter. Each winding output is weighted and accumulated by a push down stack circuit to obtain a time filtered output and the maximum an... | 09/09/1986 |
| 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 supported in a liquid bath so as to resist gravitational forces ... | 09/03/1985 |
| 4386318 | Method and apparatus to compensate a gradiometer having first and second unwanted terms A device and method producing a compensated gradiometer signal from an uncompensated gradiometer signal having at least one unwanted term which varies as a function of magnetic field. The device is comprised of a sensing unit for sensing the magnetic fiel... | 05/31/1983 |
| 4384253 | Means for achieving parallelism of the magnetic axes of a differential magnetic field probe A magnetic field differential probe has field sensors located at spaced intervals along a tensilely stressed diamagnetic wire free of mechanical support between the sensors.... | 05/17/1983 |
| 4194150 | Method and apparatus for reducing magnetometer errors 1. A method of correcting errors in the electrical characteristics of a tl field magnetometer after the magnetometer is tested and said errors are measured and resolved, which comprises correcting the core turnover errors in said total field magnetometer... | 03/18/1980 |
| 3982179 | Magnetic gradient detector with means for adjusting the parallelism of the sensors The magnetic gradient detector has two magnetic field sensors with their magnetic axes arranged parallel to an imaginary line. The sensor electrical outputs are connected with one another such that an electrical signal is created corresponding to the grad... | 09/21/1976 |
| 3961245 | Magnetic locator having improved sensors An improved flux gate sensor for a magnetic locator or the like employs a housing which enables pivotal adjustment of a tubular magnetic core contained therein in order to adjust the angular orientation of the magnetic axis of the sensor. The housing comp... | 06/01/1976 |
