Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8134358 | Method of auto calibrating a magnetic field sensor for drift and structure therefor The present invention provides a method to compensate for the sensitivity drift of a magnetic field sensor for sensing a magnetic field. The magnetic field sensor comprises at least four electrodes. The method comprises a first step where a first set of two electrod... | 03/13/2012 |
| 8072208 | Integrated circuit with tracking logic An integrated circuit including an amplifier and a first circuit. The amplifier is configured to receive a sensed signal and provide an amplified signal. The first circuit is configured to track a first signal that is based on the amplified signal. The first circuit... | 12/06/2011 |
| 8044656 | Device for calibration of a field transmitter Device for calibration of a field transmitter comprising a shaped body on which there are disposed first means for sensing magnetic fields the activation of which allows calibration of a first measurement parameter of the transmitter, second means for sensing magnet... | 10/25/2011 |
| 7994773 | Apparatus and method for in-field magnetic measurements A magnetic field verifier apparatus includes a magnetic field detection element configured to produce a voltage signal in response to an applied magnetic field wherein the voltage signal corresponds to the strength of the applied magnetic field. A current source cou... | 08/09/2011 |
| 7876090 | Calibration method and calibration apparatus for a hand-held locating device A calibration apparatus for a hand-held locating device (7) has at least one first coil configuration (1a) having a first measuring range (2′) and a second coil configuration (1a′) having a second measuring range (2 | 01/25/2011 |
| 7859249 | Tracking positions of personnel, vehicles, and inanimate objects A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the f... | 12/28/2010 |
| 7825654 | Calibration of a generator device Methods are provided for calibrating a tachometer or generator device to reduce residual errors associated with the tachometer-generator device. A shim structure is positioned within the air gap of the tachometer-generator device. A physical characteristic or locati... | 11/02/2010 |
| 7777480 | Antenna Orientation Sensor An antenna orientation sensor, having a base, a pivoting support coupled to the base. An actuator operable to move the pivoting support through a calibration movement with respect to the base. A magnetic sensor on the pivoting support and a position sensor operable ... | 08/17/2010 |
| 7746065 | Continuously calibrated magnetic field sensor A magnetic field sensor comprises a reference magnetic field generator (8), a magnetic field sensing cell (6) including Hall effect sensing elements (12), and a signal processing circuit (4) connected to the output (11) of the magn... | 06/29/2010 |
| 7719261 | Methods and systems for calibrating a sensor using a vector field Systems and methods according to exemplary embodiments address, among other features, the area of calibrating a sensor using a constant vector field. In one exemplary embodiment, a method for calibrating a sensor includes the steps of placing the sensor in a cube, r... | 05/18/2010 |
| 7679360 | Method for initializing increment position sensor An increment sensor assembly inquires an microcontroller as to the last known increment when a vehicle is started. The last known increment data is used to rotate the sensor backward to reach a lower mechanical stop position or forward to reach an upper mechanical s... | 03/16/2010 |
| 7573257 | Method and apparatus for calibrating a gradiometer A magnetic screening system uses directional gradiometers with high resolution and accuracy to measure magnetic field signatures of target objects (e.g., gun, knife, cell phone, keys) in a volume of interest. The measured signatures can be compared to signatures of ... | 08/11/2009 |
| 7441324 | Method for preventing magnetic damage to a GMR head during back-end processing A method is provided for preserving the transverse biasing of a GMR (or MR) read head during back-end processing. In a first preferred embodiment, the method comprises magnetizing the longitudinal biasing layers of the read head in a transverse direction, so that th... | 10/28/2008 |
| 7439977 | Method of displaying three-dimensional vector orientations on a two-dimensional surface A method for generating, displaying and manipulating the orientation of three-dimensional vectors on a two-dimensional surface for visualization, statistical analysis and correlation. The method involves collecting vector data, transforming each vector into spherica... | 10/21/2008 |
| 7427858 | Resolver reference position adjustment method A resolver reference position adjustment method is capable of minimizing a detection error in the rotation angle of a rotor of a motor. In the resolver reference position adjustment method in which a reference position of a resolver of an axial double angle n mounte... | 09/23/2008 |
| 7423423 | Method for quantitatively determining the width of a soft zone area of a partially hardened workpiece Disclosed is a method for quantitatively determining the width of a soft zone area of a partially hardened metallic workpiece, which has at least one hardened and one unhardened area, by means of at least one multifrequency eddy current sensor. A single workpiece be... | 09/09/2008 |
| 7414391 | Electromagnetic logging tool calibration system Techniques for calibrating an electromagnetic logging tool equipped with a plurality of antennas, with at least one antenna having its axis at an angle with respect to a tool axis, include disposing a test loop about the tool such that an axis of the tool and a plan... | 08/19/2008 |
| 7411390 | High resolution inductive sensor arrays for UXO For the inspection of materials and the detection and characterization of hidden objects, features, or flaws sensors and sensor arrays are used to image form two-dimensional images suitable for characterizing the hidden features. Magnetic field or eddy current based... | 08/12/2008 |
| 7400142 | Dynamic magnetic anomaly compensation An array of three-axis magnetometers used for dynamic magnetic anomaly compensation are located at the corners of a parallelopiped, with pairs of magnetometer outputs used to derive a magnetic anomaly gradient vector used to compensate a compass and/or the output of... | 07/15/2008 |
| 7400993 | Method and system for accuracy of speed and acceleration measurements on rotating machinery with a speed wheel A method and system for calculation of rotation dependent parameters in a system that senses shaft rotation of a toothed speed wheel. The method includes determining the passing edges of multiple gear teeth on a rotating speed wheel; calculating rotational speed of ... | 07/15/2008 |
| 7388369 | Method and apparatus for measuring hydrogen concentration in zirconium alloy components in the fuel pool of a nuclear power plant The present invention provides a method for measuring hydrogen concentration in an electrically conductive material, such as a nuclear fuel rod, comprising calibrating an eddy current probe at a plurality of hydrogen concentrations; measuring eddy currents at a plur... | 06/17/2008 |
| 7368903 | Measurement method and mobile information device A measured physical quantity calculating part 41 calculates a measurement result-corrected value obtained by correcting a measurement result of a sensor unit 25 by the use of corrected values for the sensor unit 25. Subsequently, a measurement e... | 05/06/2008 |
| 7369255 | Apparatus and method for capacitive measurement of materials Method for measuring thicknesses of a film, a foil or a material layer with a measuring head which is spaced away from the film and with which a capacitive thickness measurement is performed, in which an optical distance measurement is performed with a distance meas... | 05/06/2008 |
| 7365535 | Closed-loop magnetic sensor system A closed loop magnetic sensor system for measuring an input magnetic field from a magnetic field source has a compensation circuit, which can be for example a printed wire board, and a magnetic sensor, such as a Magnetoresistive (MR) sensor, for measuring an input m... | 04/29/2008 |
| 7353614 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One suc... | 04/08/2008 |
| 7355394 | Apparatus and method of dynamically measuring thickness of a layer of a substrate A method and apparatus are provided for measuring the thickness of a test object. The apparatus includes an eddy current sensor having first and second sensor heads. The sensor heads are positioned to have a predetermined gap therebetween for passage by at least a p... | 04/08/2008 |
| 7352177 | Three-axis fluxgate-type magnetism detecting device and method A three-axis fluxgate-type circuit having three fluxgate sensors for outputting three analog voltage values respectively. A controller normalizes three digital voltage values corresponding to said three analog voltage values, select a set of linear voltage values fr... | 04/01/2008 |
| 7348771 | Method for verifying sensor condition Sensor condition verification may be performed on electromagnetic sensors and sensor arrays mounted to a material surface. The sensors typically have a periodic winding or electrode structure that creates a periodic sensing field when driven by an electrical signal.... | 03/25/2008 |
| 7345470 | Probe card and method for testing magnetic sensor A probe card comprises a plurality of coils for impressing a magnetic field in changeable directions to a magnetic sensor and a group of probes for detecting an output signal of the magnetic sensor. A manufacturing cost of the magnetic sensor can be decreased. ... | 03/18/2008 |
| 7337549 | Input device for using geomagnetic sensor and a method thereof for generating input signal An input device using a geomagnetic sensor includes a geomagnetic sensor outputting a voltage corresponding to geomagnetism, and a control part calculating an azimuth using the voltage output from the geomagnetic sensor and calculating the rotation angle by comparin... | 03/04/2008 |
| 7336068 | Field device and method for calibrating a field device The invention relates to a field device and a method for calibrating a field device, having a field device electronics and a sensor unit for process measurements, wherein the field device electronics receives measurement signals of the sensor unit, wherein the field... | 02/26/2008 |
| 7319331 | Two loop calibrator Misalignment of the transmitter and receiver coils of an induction logging tool is determined by positioning the logging tool with a coil axially encompassing the transmitter coil and/or the receiver coil, and activating the transmitter at a plurality of rotational ... | 01/15/2008 |
| 7312607 | Eddy current part inspection system At least one measurement coil of an eddy current part inspection system is oriented relative to a track surface so that the longitudinal axis of the magnetic field generated by the at least one measurement coil is skewed relative to the track surface so as to be sub... | 12/25/2007 |
| 7309618 | Method and apparatus for real time metal film thickness measurement A semiconductor processing system is provided. The semiconductor processing system includes a first sensor configured to isolate and measure a film thickness signal portion for a wafer having a film disposed over a substrate. A second sensor is configured to detect ... | 12/18/2007 |
| 7304475 | Mechanism for and method of biasing magnetic sensor A magnetic sensor package having a biasing mechanism involving a coil-generated, resistor-controlled magnetic field for providing a desired biasing effect. In a preferred illustrated embodiment, the package broadly comprises a substrate; a magnetic sensor element; a... | 12/04/2007 |
| 7301330 | Electronic sensing circuit that compensates for reference voltage drift A sensor (10) has an output coupled to a first comparator input. A control circuit (18) is arranged to switch from an upward tracking mode to a downward relative level detection mode, to a downward tracking mode, to an upward relative level detection m... | 11/27/2007 |
| 7301336 | Magnetic field generator device for calibration of magnetic force microscope The magnetic field generator device comprises a plurality of magnetic field generator units, which generate distinct magnetic fields in different locations, and at least two or more of these magnetic field generator units have different external shape, configuration... | 11/27/2007 |
| 7289924 | Self-calibrating sensor A method for self-calibrating a sensor can be implemented in a system having a calibration circuit. The calibration circuit has differential circuitry which compares an output signal of the sensor with a predetermined reference signal associated with a reference pro... | 10/30/2007 |
| 7288931 | Method for determining residual error compensation parameters for a magnetoresistive angle sensor and method for reducing a residual angle error in a magnetoresistive angle sensor In a method of determining residual error compensation parameters for a magnetoresistive angle sensor providing a first measurement signal depending on a rotational angle the step of generating a plurality of value pairs for a plurality of rotational angle values is... | 10/30/2007 |
| 7282909 | Methods and apparatus for determining the thickness of a conductive layer on a substrate A method of determining the thickness of a conductive film is disclosed. The method employs measured voltage and current responses that have been temperature-compensated to determine the thickness of the conductive film. The temperature compensation uses a temperatu... | 10/16/2007 |
