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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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
5541509 Electrical cable jacket and conductor eccentricity detector including energizing coil formed about a toroid core and movable pickup coil  
An apparatus for use in determining the thickness of the insulated coating of an electrical cable manufactured in an extrusion process having means for generating an alternating current in the...
5525900 Method for determining the displacement of an object of an electrically conducting material  
A method for determining a displacement of an object of an electrically conductive material. The method includes the step of using a transducer to establish an electromagnetic field for creating...
5521496 Detection circuits for position sensors  
A detection circuit for a position sensor has drive circuitry 3 connected to two impedance elements 1a, 1b having an impedance which varies in dependence on the position of a movable member, so as...
5471138 Inductive valve motion sensor for positioning outside the body of the valve  
The motion of a DISC for a check valve is tested and sensed by placing coil sensors on the check valve. The coils produce a magnetic field within the valve near the DISC such that the DISC moves...
5444368 Differential reactance permanent magnet position transducer  
A differential reactance permanent magnet transducer has a stator with at least two pole elements, each having an electrically conductive coil wound thereabout. The reluctances of the stator pole...
5394082 Magnetic lauer compositions for use in a device for determining the position of an axially movable body  
A device for determining the position of an axially movable body wherein the position of the body is deduced from the inductance of a coil arrangement. A layer which has a layer structure...
5365168 Measuring instrument for contactless determination of an angle of rotation of an adjusting shaft  
A measuring instrument for contactless determination of an angle of rotation of an adjusting shaft. To avert transmitting a tumbling motion from the adjusting shaft to the measuring instrument, a...
5327078 Position detecting apparstus having a mean value calculating circuit including a low pass filter  
A position detecting apparatus for magnetically detecting the position of, for example, a cylinder rod of a construction or industrial machine, a piston of an automotive engine or a scaler of a...
5283519 Operation of inductive distance sensor by scaling output signal by vectorially obtained factor  
A method of operating an induction distance sensor employs a sensor having a vane or tongue of magnetic material disposed movably between two inductive coils for changing their inductances in the...
5252918 Apparatus and method for electromagnetically detecting the passing of a plug released into a well by a bridge circuit  
A plug released into an oil or gas well carries one or more metallic strips that affect the inductance of a resistive-inductive bridge circuit mounted adjacent a conduit through which the plug and...
5223830 Sensor circuit  
A sensor circuit has a measuring circuit in which measuring signals occur at two different circuit points and signals at one point change oppositely to signals at the other point during changing of...
5211539 Apparatus for indicating the pitch of turbofan blades  
Apparatus indicates changes in blade pitch of variable pitch blades by detecting relative displacements of first and second members of a blade pitch actuator. The members are selectively displaced...
5210491 Measuring device for the contactless determination of a change in linear travel and/or angle of rotation with fixable place of highest measurement accuracy and smallest drift errors  
A measuring device for contactless determination of a change in a linear travel or angle of rotation includes two bodies movable relative to one another, and at least two electrical elements...
5173658 Inductive proximity sensor with force transferring support post for use in high pressure environments  
A high pressure proximity sensor for high pressure environments uses a balanced bridge variable inductance magnetic core structure to detect the presence of a external ferrous object by a change in...
5132617 Method of measuring changes in impedance of a variable impedance load by disposing an impedance connected coil within the air gap of a magnetic core  
The present invention relates to a method and apparatus for remotely detecting impedance. It is specifically adapted for use on a polishing machine wherein the end point of polishing for removing a...
5126665 Device for measuring an angle of rotation of a rotatable structural element  
A device for measuring an angle of rotation has a central longitudinal groove (12) extending in a coil body (11) from the front end surface thereof so that two cores (13, 14) having a semicircular...
5107212 Measuring arrangement having axially and radially offset sensor coils for contactless determination of rotation angle  
A measuring arrangement for contactless determination of rotation angle has two bodies arranged movably relative to one another, sensor coils with inductive and alternating current resistance...
5083084 Device for contactless measuring of rotational angle or rotational speed  
In a measurement device for contactless determination of the rotation angle and/or rotation speed, a disk is fastened on a shaft so as to be fixed with respect to rotation relative to it. During...
5079502 Proximity sensor having a bridge circuit with a voltage controlled resistance  
Proximity sensors for detecting the presence of metal objects such as sheet metal workpieces within workpiece engaging devices such as grippers and shovels. The proximity sensors are jacketed in a...
5065093 Inductive proximity sensor for detecting an object starting electrical conductivity  
Inductive proximity sensor for detecting an object having electrical conductivity comprising a sensor housing, a measuring coil and reference coil placed on either side of a plane of symmetry...
5045786 Circuit for measuring a variable inductance connected in series with a fixed inductance  
An oscillator (10) supplies via a first feeding path a fixed frequency signal to the fixed inductance (L o ) connected in series with a variable inductance (L). The signal at the common connection...
5036236 Air gap matching proximity sensor for magnetic bearings  
A pricisely dimensioned gap between relatively movable surfaces (14,16) is maintained in a magnetic bearing by use of proximity sensors (22a, 22b, 23a, 23b). Each sensor includes a magnetic...
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...
5025214 Circuit and process for converting a half bridge transducer output signal to an LVDT transducer output signal  
A circuit and a process for converting the output signal from a half bridge transducer to that from an LVDT transducer to enable direct use of either signal in an electronic column. The circuit...
5010298 Variable inductance displacement measuring device with slidable metal sleeve and ferrite bead core  
A displacement measuring apparatus including a variable inductance coil formed of a pair of coils, on a core of predetermined length made of a material having high magnetic permeability. The pair...
4967154 Dynamic tube runout measuring method and apparatus with square wave energized reluctance measuring coils  
Runout of a high speed, small diameter test rod in a drill spindle is measured by locating a pair of magnetic cores on opposite sides of the rod to establish a pair of magnetic circuits which...
Matches 1 - 50 out of 94 1 2 >