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| Number | Title | Issue Date |
| 7948229 | High temperature electronics for passive eddy current sensors A system and method for sensing the periodic proximity of one or more objects, such as the rotating blades of a gas turbine. The system includes a passive eddy current sensing unit having first and second magnets and first and second coil-wound cores coupled to gene... | 05/24/2011 |
| 7378721 | Chip on lead frame for small package speed sensor A sensor package apparatus includes a lead frame substrate that supports one or more electrical components, which are connected to and located on the lead frame substrate. A plurality of wire bonds are also provided, which electrically connect the electrical compone... | 05/27/2008 |
| 7372253 | Magnetic field sensor for measuring the rotational speed of a turboshaft A sensor for measuring the rotational speed of a turboshaft of a turbocharger includes a sensor housing and a sensor element which is positioned in the sensor housing and which senses a variation of a magnetic field caused by the rotation of the turboshaft. In order... | 05/13/2008 |
| 7253609 | Encapsulated measuring apparatus for detecting a velocity and/or acceleration of a rotationally or linearly moved component An encapsulated measuring device for detecting a velocity and/or acceleration of a rotationally or linearly moved component. The device includes a measuring device housing having a wall, and a scanning unit arranged in the housing, the scanning unit including a scan... | 08/07/2007 |
| 7209844 | Magnetic crash sensor A first magnetic field generated by a first coil operatively associated with a first portion of a vehicle interacts with at least one conductive element operatively associated with or at least a part of a second portion of the vehicle so as to generate an eddy curre... | 04/24/2007 |
| 7185444 | Modular scanning unit of a position measuring system A modular scanning unit for a position measuring system and including a support having a recess with a guide surface and a holder adjustably supported upon the support, wherein the holder has a light source and a beam-shaping device aligned with the light source. A ... | 03/06/2007 |
| 7176676 | Apparatuses and methods for monitoring rotation of a conductive microfeature workpiece Apparatuses and methods for monitoring microfeature workpiece rotation during processing, such as brushing, by monitoring characteristics corresponding to a state of a magnetic field proximate to the rotating microfeature workpiece are disclosed herein. The characte... | 02/13/2007 |
| 7112961 | Method and apparatus for dynamically measuring the thickness of an object 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... | 09/26/2006 |
| 7082829 | Ferraris sensor A Ferraris sensor for measuring an acceleration of a moving body along a direction. The sensor includes a flat eddy current body and a scanning head arranged on one side of the eddy current body. The scanning head includes N magnets that generate an external magneti... | 08/01/2006 |
| 7069171 | EMI noise filter for eddy current turbo speed sensor A turbocharger speed controller includes a rising rate limiter having an input receiving a turbocharger speed signal and an output producing a rate limited turbocharger speed signal, a high envelope filter having an input receiving the rate limited turbocharger spee... | 06/27/2006 |
| 7030603 | Apparatuses and methods for monitoring rotation of a conductive microfeature workpiece Apparatuses and methods for monitoring microfeature workpiece rotation during processing, such as brushing, by monitoring characteristics corresponding to a state of a magnetic field proximate to the rotating microfeature workpiece are disclosed herein. The characte... | 04/18/2006 |
| 7023205 | Eddy current sensor capable of sensing through a conductive barrier An eddy current sensor that can be mounted on the outside of a casing for a turbine or other rotating machinery to measure characteristics of nearby, moving, electrically conductive objects through the casing. Monodirectional and omnidirectional sensors are provided... | 04/04/2006 |
| 6992476 | Transmitter system for a ferraris motion transmitter A highly simply technical transmitter system for a Ferraris movement transmitter, wherein several magnetic field generators (M1,M2,M3) form at least one magnetic circuit with a moveable, non-magnetic electrically conducting rotating measuring bo... | 01/31/2006 |
| 6930613 | Electrical instruments circuits A device representing a simple means of multiplying the functionality of wiring in point to point control circuits such that fault tolerant, fault reporting circuits can be constructed with less wire. The circuit can employ the wiring on a continuous basis by the us... | 08/16/2005 |
| 6927567 | Passive eddy current blade detection sensor A passive blade detection sensor exploits the electrically conductive trait of typical turbo machinery components such as fan, compressor and turbine blades. A permanent magnet is placed strategically adjacent to a wire coil to generate a single pulse/antipulse sign... | 08/09/2005 |
| 6906513 | Rotary motion detector A rotary motion detector includes an electrically conducting induction element formed essentially as a hollow cylinder and rotatable about a rotation axis. An excitation assembly applies an inhomogeneous magnetic field and induces an eddy current in the induction el... | 06/14/2005 |
| 6885187 | Transmitter system for a ferraris motion transmitter A transmitter system for a Ferraris motion transmitter, includes a magnetic measuring arrangement including at least one magnetic field generator for generating a magnetic field and an electrically conductive measuring body, with the magnetic field generator and the... | 04/26/2005 |
| 6851318 | Motion detector according to the Ferraris principle In a motion detector according to the Ferraris principle, an excitation element applies an inhomogeneous time-dependent alternating magnetic field to an induction element. A motion of the induction element induces in the induction element an eddy current with a temp... | 02/08/2005 |
| 6850053 | Device for measuring the motion of a conducting body through magnetic induction A device for measuring a motion of a moving electrically conducting body is disclosed. A magnetic field generated by, for example, electromagnets or permanent magnets, penetrates at least a partial area of the moving body. Two or more measuring devices are arranged ... | 02/01/2005 |
| 6741058 | Drive unit for initialization A drive unit for calibrating an indicator/meter of a vehicle is provided in which a pointer in an indicator for a vehicle can point immediately after an ignition switch is turned ON, and the frequency of seeing motion of the pointer in an initializing operation by a... | 05/25/2004 |
| 6736009 | Measurement system comprising an acceleration sensor and a position sensor A measurement system for determining acceleration and a position of an object. The measurement system includes a first sensor system for determining an acceleration of an object, the first sensor having a body with an electrically conducting measuring structure, a d... | 05/18/2004 |
| 6731092 | Apparatus and method for initializing stepper motor A stepper motor is initialized so that the exciting signal is applied to coils with the step shifted by half of one electric cycle from the rebounding step being synchronized with the timing when the stopper piece is brought into contact with a fixed stopper. The re... | 05/04/2004 |
| 6650106 | Device for eddy current measurement of a motion of a conducting body in a magnetic field A motion parameter of an at least partially conducting moving body is measured with a measuring device having at least one coil with a coil axis tangential to the motion direction of the moving body. A primary magnetic field induces electrical currents in... | 11/18/2003 |
| 6636032 | Angular measurement system having an integrated ferraris sensor Besides the measurement of angular position, an angular measurement system having an integrated Ferraris sensor also permits the direct measurement of angular acceleration or angular velocity. A graduated disk and an eddy-current disk are configured conce... | 10/21/2003 |
| 6538433 | Method and apparatus for non-contact measuring of metal bed parameters In a method and device for measuring at least one parameter of a metal bed, measuring is obtained by a magnetic field being generated from one side of the metal bed so that eddy currents are generated in the metal bed as the metal bed moves relative to th... | 03/25/2003 |
| 6462535 | Eddy current sensor with a modification coil for reducing extensive heating and a method for operating such an eddy current sensor An eddy current sensor including an arrangement for generating a first magenetic flux, which is essentially directed vertically with respect to a moved body, a detector coil for detecting an eddy field in the moved body and a second arrangement which gene... | 10/08/2002 |
| 6326777 | Device for sensing eddy currents in moving bodies A device for sensing velocity variations in a conductive body 10 moving through a magnetic gap 12 between two discrete portions 13, 14 of a magnetic circuit 15. The magnetic circuit 15 generates a magnetic flux 16 in the gap 12 to induce eddy currents 17 ... | 12/04/2001 |
| 6291987 | Method and system for detecting incipient failures in a power inverter A method and system for predicting malfunctions in a power inverter having one or more legs connected between first and second voltage buses is provided. Each leg has respective first and second controllable switches coupled in series to one another. The ... | 09/18/2001 |
| 6073087 | Digital tachometer A circuit for generating a speed value corresponding to a rotational frequency of a rotating shaft. A digital tachometer circuit has a tachometer circuit and a copy/hold circuit. The tachometer circuit maintains an intermediate speed value which is increm... | 06/06/2000 |
| 6043644 | Device for detecting position and movement by using magnetic field variation The present invention concerns the domain of inductive contactless sensors, allowing the position and/or the movement of a target sensitive to a magnetic field to be detected. The invention provides a miniature sensor comprising at least a primary coil ge... | 03/28/2000 |
| 5942893 | Shielded eddy current sensor for enhanced sensitivity An eddy current sensor comprises a generally E-shaped core having three parallel legs joined together by a bridge. Current carrying coils are mounted on each of the outer legs and a signal coil is mounted on the central leg. Identical a.c. currents are ca... | 08/24/1999 |
| 5428992 | Generating a once-per-cycle signal for a locomotive diesel engine A locomotive diesel engine test assembly generates a once-per-cycle signal phased to the top dead center of a predetermined piston in its cylinder. A locomotive diesel engine crankcase door is hermetically attached to the crankcase so as to cover a camsha... | 07/04/1995 |
| 5373234 | Inductive speed or torque sensor with compensation for external magnetic fields A speed or torque probe comprises a permanent magnet havings its north-south axis extending radially of a bladed rotor, so that the tips of the blades pass in close proximity to one pole of the magnet, and a T-shaped pole piece. A first portion of the pol... | 12/13/1994 |
| 5200698 | System for sensing the position of a rotating steel shaft including a track formed by a strip having discontinuous electrical properties, and a method of manufacturing such a track A system for sensing the position of a rotating steel shaft (1), the system comprising an eddy current sensor and a track (3) fixed to the shaft and going past the sensor, the track being constituted by a strip (4) of electrical insulation material having... | 04/06/1993 |
| 5144231 | Eddy current detector for detecting an object with offset compensation An RF oscillator induces eddy currents to be measured in an object. An eddy current probe senses alterations, such as teeth on a disc, for example, in the object which are represented as eddy current signals sensed by an eddy current probe. The present in... | 09/01/1992 |
| 5027067 | Measuring device for contactless measurement of a rotational angle of a rotating shaft using eddy currents A device for contactless measurement of a rotational angle of a rotating part that is rotatable via a rotating shaft. The device includes a cylindrical coil carrier with sensor coils and a tubular body of electrically conductive material that is firmly at... | 06/25/1991 |
| 4973905 | Eddy current measuring device with flux return element In an eddy-current measuring device, a permanent magnet (2) which is arranged fixed for rotation on a drive shaft (1) is magnetized axially. An eddy-current element (4) has the shaped of a disk and is located with slight axial spacing from the permanent m... | 11/27/1990 |
| 4914713 | Rotation detection or speed pickup device for miniature d-c motor In order to pick up in a simple manner which is reliable, and under rough operating conditions, a rotation of the rotor in a miniature motor excited by permanent magnets with magnet segments at a tangential distance with magnet segments distributed at the... | 04/03/1990 |
| 4811255 | Tachometer, RPM processor, and method The invention comprises a tachometer for aircraft for determining engine operating parameters from magneto signals from right and left magnetos. A signal conditioning circuit receives ignition signals from at least one magneto and modifies the ignition si... | 03/07/1989 |
| 4761609 | Tachometer signal conditioner A tachometer signal conditioner circuit functions to accept a wide range of input signals and produces a digital pulse signal which indicates a gear shaft phase reference position. Tachometer input signals of either a true 1/revolution or an N/revolution ... | 08/02/1988 |
