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| Number | Title | Issue Date |
| 7420362 | Sensor array for detecting the movement of a positioning element moved back and forth using an actuator The invention relates to a sensor array for detecting travel of a movable member, especially a positioning element that is movable using an actuator. Said sensor array comprises a stationary coil arrangement (18) that is provided with an active coil (18.1 | 09/02/2008 |
| 7323863 | Inductive transducer measurement system An inductive transducer measurement system is provided. A measuring circuit simultaneously drives a plurality of transducer windings and measures their inductance by using a load impedance in an inductance measurement circuit configuration. The system may be designe... | 01/29/2008 |
| 7312615 | System and method for communicating calibration data A Force/Torque (FT) sensor includes memory for storing calibration data associated with the FT sensor. Force and torque analog signals are output to a data acquisition (DAQ) system. The digital calibration data is output to the DAQ system as a digital bitstream comp... | 12/25/2007 |
| 7308833 | Torque sensor, wire harness, electric power steering assembly and terminal holder In a torque sensor having lead pins connected to a wire harness, the wire harness includes: a plurality of lead wires; a plurality of connection terminals each having a sleeve mounted around each of the lead pins and a connection portion extended from an outer perip... | 12/18/2007 |
| 7302940 | Variable reluctance position sensor A position sensor is disclosed having a transducer formed by a Hall-effect device and permanent magnet secured within a housing on either side of a low permeability gap. A target secured to an active member, such as an EGR valve plunger moves within the gap. The tar... | 12/04/2007 |
| 7288933 | Position detecting system that self-monitors for connectivity faults A system for detecting position that is capable of self-monitoring for connectivity faults. In one embodiment, the system comprises a transformer, an excitation potential source, a bias potential source, and a processor. ... | 10/30/2007 |
| 7195645 | In vivo joint space measurement device and method A joint endoprosthesis system has first and second prosthetic components. The second prosthetic component has a bearing surface. The interface of the bearing surface and the first prosthetic component defines the joint articulation. A signal source and sensor are af... | 03/27/2007 |
| 7145325 | Displacement detection apparatus and displacement detection method Improving reducing or eliminating the effects of variation in characteristics of the resonance circuit in a resonance type displacement detection apparatus, so as to improve displacement detection accuracy. In a displacement detection system 10, the resonance... | 12/05/2006 |
| 7141967 | Sensor arrangement A sensor arrangement includes at least two half bridges coupled together to form at least a Wheatstone bridge, and includes at least two magnetoresistive sensor elements in each half bridge. These sensor elements are sensitive along a measuring direction to the magn... | 11/28/2006 |
| 7132825 | Detection device A device for detecting the displacement of an object comprising a ferromagnetic material, comprises a magnetic circuit generator provided with first and a second cores made of ferromagnetic material and an excitation coil and a measurement coil. The magnetic circuit... | 11/07/2006 |
| 7066256 | Apparatus and method of detecting interfaces between well fluids An apparatus for use in circulating cement in a casing in a wellbore is described having a first component such as a sensor disposed on the casing and a second component such as a detectable device disposed at a fluid interface formed between the cement and a fluid.... | 06/27/2006 |
| 7061230 | Circuit and method for measuring distances A circuit for measuring distances and which has at least two inputs (1, 2), at least one measuring coil (3), and at least one signal source, wherein at least two input signals (epos, eneg) are generated by means of the signal sour... | 06/13/2006 |
| 7053604 | Sensor detecting movement of a control element moved by an actuator A sensor for detecting movement of a control element moved by an electromagnetic actuator comprises a fixed coil arrangement having at least one coil connected to a current supply and to a signal detection device. A housing circumferentially encloses the fixed coil ... | 05/30/2006 |
| 7049810 | Apparatus to measure fill An apparatus for indicating the wall thickness of a cored welding wire traveling in a given path to determine the percentage of volume of fill. This apparatus comprises a first induction coil surrounding the path; a source of AC current connected across the coil; a ... | 05/23/2006 |
| 7023199 | Position sensing cylinder cap for ease of service and assembly An actuator arrangement includes a body and at least one of a piston assembly and a rod assembly slideably disposed in the body. A sensor arrangement includes a sensor, a sensor electronics module, and an interactive element. The interactive element is moveable rela... | 04/04/2006 |
| 7018002 | Motor vehicle master cylinder with device for detecting actuation of a braking system The invention proposes a master cylinder 1 with a device for detecting actuation of a braking system. The detection device is fixed to a body 2 of the master cylinder 1 at a pressure chamber 5. The detection device comprises a magnetic ci... | 03/28/2006 |
| 6969987 | Hybrid inductive sensor A hybrid speed and or proximity sensor may include a variable reluctance sensor with an added excitation circuit. Similarly, a hybrid speed and or proximity sensor may include a variable inductance proximity sensor having a magnet and a magnetically permeable pole p... | 11/29/2005 |
| 6953089 | Apparatus and method of detecting interfaces between well fluids An apparatus for use in circulating cement in a casing in a wellbore is described having a first component such as a sensor disposed on the casing and a second component such as a detectable device disposed at a fluid interface formed between the cement and a fluid.... | 10/11/2005 |
| 6891364 | Sensor arrangement for recording the movement of an armature with suppression of interfering voltages A sensor arrangement for recording the movement of an armature on an electromagnetic actuator for operating a control element, in particular for operating a gas exchange valve of an internal combustion engine, has an axially displaceable bar-like sensor piece, made ... | 05/10/2005 |
| 6870365 | Rotation detecting device Six magneto-resistance segments are formed by film-forming on a signal processing circuit part consisting of an IC chip and are disposed in a predetermined rotation direction of a magnetic moving body, symmetrically about the centerline of a magnet perpendicular to ... | 03/22/2005 |
| 6853183 | Non-contact position sensor having helicoidal conductor forming a measuring surface covering a measuring object A device for contactless measurement of a displacement path, especially for the detection of position and movement, includes a sensor electronics system for the provision of an alternating current and the evaluation of alterations therein, in addition to an inductiv... | 02/08/2005 |
| 6844722 | Mutual inductance bridge for detection of degradation in metallic components An inductive bridge circuit using mutual inductances to transform impedances is used for detection of wall-thinning defects in metals. The bridge circuit has a first test coil placed adjacent to a good metal section and a second test coil placed adjacent to a metal ... | 01/18/2005 |
| 6828781 | Sensor array What is described is a sensor array with at least two sub-bridges, which are coupled together to form at least one Wheatstone bridge and which are equipped, in each of the sub-bridges, with at least two magnetoresistive sensor elements, wherein the sensor elements a... | 12/07/2004 |
| 6703805 | System for measuring the position of an electric motor An electric system utilizes dynamic impedance changes in windings of an electric motor to measure/monitor mechanical position. The method employs a bridge amplifier to measure voltage at a center node or windings against a voltage derived from a reference... | 03/09/2004 |
| 6581479 | Relative-rotational-position detection apparatus An outer cylinder having patterns of open windows of first to fourth channels is formed of a magnetic-shielding or antimagnetic substance. An inner cylinder is inserted in the outer cylinder, is formed of a magnetic substance and has patterns of nonmagnet... | 06/24/2003 |
| 6499368 | Miniaturized pressure equalized displacement sensor assembly The novel sensor assembly is comprised of a threaded housing with pressure relief tracks through the threads that terminate at a hole through the housing and a displacement sensor. In the preferred embodiment, we have included an integral connector, a sup... | 12/31/2002 |
| 6469500 | Method for determining the position and/or speed of motion of a control element that can be moved back and forth between two switching positions The invention relates to a method for determining the position and/or the speed of motion of a control element which can be moved back and forth between a first and second switching position. According to said method, an immersion body which is connected ... | 10/22/2002 |
| 6392407 | Rotation angle detecting device In a rotation angle detecting device, a circuit scale thereof is reduced and a manufacturing cost thereof is lowered. The rotation angle detecting device is arranged by comprising: a bridge circuit for converting a magnetic field change of an MR element i... | 05/21/2002 |
| 6204659 | Inductance change detection circuit An inductance change detection circuit for detecting a change in inductance with a simple circuit design, having a series circuit having a resistor and a coil of which an inductance changes according to a position of an object; a pulse power supply 1 for ... | 03/20/2001 |
| 6175232 | Micromachined inductive sensor having capacitively decoupled coils This micromachined inductive sensor is used to detect, without contact and through the intermediary of a radiated alternating magnetic field, the position and/or the movement of an object capable of modifying this magnetic field and including for this pur... | 01/16/2001 |
| 6121769 | Method of and apparatus for detecting malfunction of displacement detector Displacement detector includes a displaceable core, two detecting coils variable in their inductance in response to displacement of the core, and two reference resistances each connected in series with the corresponding detecting coil. Pulse power is supp... | 09/19/2000 |
| 6034526 | Apparatus for controlling the inflation pressure of a mattress in response to deformation of the mattress using impedance measurement A method and apparatus for supporting a patient on a mattress. The apparatus includes a mattress which has at least one controlled release chamber with a top face and a bottom face. A flexible film of a thin metal foil is linked to the top face, while at ... | 03/07/2000 |
| 5977752 | Control signal generator A control signal generator for generating a plurality of control signals has a pivotally mounted control lever with an actuating member (24) . Diametrically opposite sensors (28,30) have stems (40,42), which can be pushed down by the actuating field (26).... | 11/02/1999 |
| 5952822 | Method and apparatus for proximity sensing in the presence of an external field An inductive proximity sensor and a method of proximity sensing are described that permit targets of interest to be detected despite the presence of external magnetic fields due to AC or DC sources, such as resistive welding machines. The sensor has a pai... | 09/14/1999 |
| 5914593 | Temperature gradient compensation circuit The novel temperature gradient compensation circuit is designed to overcome temperature gradient problems in inductive or capacitive circuits, such as, differential variable reluctance transducers. The system comprises, in one embodiment, the use of an in... | 06/22/1999 |
| 5781006 | Magnetic sensor for indentifying the position of a test subject A magnetic distance sensor for acquiring the position of a test subject has an elongated magnetic core that contains crystalline strips and amorphous strips. A measuring winding supplied by a constant current source generates respective voltages, directed... | 07/14/1998 |
| 5760578 | Inductive displacement sensor system detecting displacements in two directions using a multi-bridge circuit A displacement sensor system is provided which is capable of simultaneously and independently detecting displacements in two directions orthogonal to an axis of an object to be detected, using a less number of displacement sensors than before. The displac... | 06/02/1998 |
| 5721487 | Diagnostic range/position measuring device A sensor bridge circuit (20) sensitive to a proximate target (12). The bridge circuit (20) has two inductor (24, 28) and two resistors (32, 34). One inductor (24) has a reactance that varies with respect to the distance (26) of the target (12) from the in... | 02/24/1998 |
| 5712563 | Steering torque sensor utilizing a displacement detector having a pulse power supply A displacement detector for enabling a precise detection of a displaced quantity of the core. The displacement detector is provided with a displaceable core, a detecting coil the inductance of which varies in response to a displaced quantity and a referen... | 01/27/1998 |
| 5585718 | Device for detecting the bending magnitude of a shaft A device for detecting a bending magnitude of a rotary shaft comprises a first pair of coils spaced from and facing the outer surface of a shaft and having an inductance value, and a second pair of coils spaced from and facing the outer surface of the sha... | 12/17/1996 |
