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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7391202 | Linear variable differential transformer (LVDT) system using an inductance of an LVDT primary as a micro-power excitation carrier frequency to lower a drive power A linear variable differential transformer (LVDT) system is disclosed. The system has an LVDT. A signal conditioner circuit is coupled to the LVDT. The signal conditioner circuit uses an inductance of the LVDT primary as a micro-power excitation carrier frequency to... | 06/24/2008 |
| 7372254 | Linear force detecting element formed without ferromagnetic materials which produces a resolution in a range of microns or less A force detecting element is used to move a moving coil that is formed without ferromagnetic materials and is driven using a stationary coil that is formed without ferromagnetic materials, thereby producing an output signal which is more linear than the previous tec... | 05/13/2008 |
| 7321229 | Inductive position sensors with secondary windings with increased or decreased number of turns A position sensor comprising a primary winding (26) for generating a magnetic flux, a first secondary winding (24.1) the number of turns of which increases in one direction, a second secondary winding (24.2) the number of turns of which increase... | 01/22/2008 |
| 7292026 | Signal conditioning system for inductive position sensor An apparatus and a method for providing an output signal correlated with a part position for a moveable part over a positional range, the apparatus includes a transmitter coil, the transmitter coil producing an electromagnetic field when excited by an exciter signal... | 11/06/2007 |
| 7271582 | Linear variable differential transformers for high precision position measurements A linear variable transformer (LVDT) for use in a transducer. The LVDT has a non-ferromagnetic core which may eliminate Barkhausen noise and thereby improve the sensitivity of the resulting measurements. In one aspect, this system may be used in an atomic force micr... | 09/18/2007 |
| 7262592 | Linear variable differential transformers for high precision position measurements A linear variable differential transformer (LVDT) is disclosed that has first and second coil is formed of materials that minimize the Barkhausen noise, and hence which produces outputs that are substantially independent of any Barkhausen noise. In an embodiment, th... | 08/28/2007 |
| 7252009 | System and method for pressure measurement A system and method for pressure measurement may include the ability to readily produce a pressure measurement system. In one general aspect, a process for producing a pressure measurement system includes providing an assembly including a stem, a pressure detector, ... | 08/07/2007 |
| 7233140 | Position sensing assembly with sychronizing capability A linear variable transformer, or LVDT, for use with the transducer, which has a non-ferromagnetic core that can eliminate Barkhausen noise. By eliminating the Barkhausen noise, the sensitivity of the resulting measurements can be improved. The LVDT is formed of mul... | 06/19/2007 |
| 7053603 | Circuit arrangement with a linear variable differential transformer (LVDT) as a displacement sensor or force sensor In a circuit arrangement having a linear variable differential transformer as a displacement sensor or force sensor, having a selection circuit which is connected to the primary coil of the transformer and which provides an output current for triggering the primary ... | 05/30/2006 |
| 7038443 | Linear variable differential transformers for high precision position measurements A linear variable transformer (LVDT) for use in a transducer. The LVDT has a non-ferromagnetic core which may eliminate Barkhausen noise and thereby improve the sensitivity of the resulting measurements. In one aspect, this system may be used in an atomic force micr... | 05/02/2006 |
| 7019514 | Rotary to linear LVDT system A rotary input for a linear variable differential transformer (LVDT) system connects to a gear reduction system. The gear reduction produces a reduced rotary output in a rotary output member. The output member is threaded, and a nut is threaded onto the output membe... | 03/28/2006 |
| 6912427 | Programmable limit switch with distributed intelligence A programmable limit switch includes output channels for receiving position data, each position value of the position data representing an incremental advance of a workpiece through a production field, and for producing actuation signals. The channels are connectabl... | 06/28/2005 |
| 6909426 | Tablet system with inductive loops and cord less-battery less pointer apparatus controlled by multi-channel switches set and method for transmitting and receiving its signal The purpose of the present invention is to reduce power consumption caused by controlling circuit in transmitting/receiving process between tablet system and cord less-battery less pointer apparatus. The present invention provides multi-channel switches set produced... | 06/21/2005 |
| 6864808 | System and method for processing a signal Analog circuitry is disclosed for conditioning a signal from linear and rotary variable differential transformers having a primary winding, a pair of secondary windings and a movable core. The circuitry includes a unique closed loop negative feedback mechanism which... | 03/08/2005 |
| 6781366 | Circuit for displacement detector having sensor with a sensor coil forming differential transformer A circuit for a displacement detector having a contact sensor with a sensor coil forming a differential transformer is disclosed. The circuit includes a driver for generating a driving signal for driving the sensor coil, a standard signal processor for processing th... | 08/24/2004 |
| 6605940 | Linear variable differential transformer assembly with nulling adjustment and process for nulling adjustment A linear variable differential transformer (LVDT) assembly comprises a housing. A tube extends into the housing. An armature mounts inside of the tube and can move longitudinally within the tube. A coil assembly, which includes a primary coil and two seco... | 08/12/2003 |
| 6552666 | Phase difference detection device and method for a position detector Two A.C. output signals amplitude-modulated in accordance with two function values (sine and cosine) differing from each other in correspondence to a position-to-be-detected are received from a position sensor such as a resolver. By performing an addition... | 04/22/2003 |
| 6489760 | High sensitivity displacement measuring device using linear variable differential transformer The present invention is intended to provide a ultra-precision high sensitivity displacement measuring device which has such a high resolution as to be able to make submicron measurement. According to the invention, there is provided a displacement measuring ... | 12/03/2002 |
| 6034624 | Induction-type linear position detector device A winding section includes a primary winding to be excited by a single-phase A.C. signal, and a plurality of secondary windings provided at different locations with respect to a predetermined direction of linear movement. A variable magnetic coupling sect... | 03/07/2000 |
| 5808904 | Continuous duty tie rod press strain monitor An apparatus (20) for press operation data acquisition comprises a tie rod (45a) for bearing a load during a press cycle. The rod (45a) has a load bearing portion (76) and a non-load bearing portion (78). An elongated, axially extending bore (75) is forme... | 09/15/1998 |
| 5801645 | Automatic paired LVDT probe balancing The apparatus and method of the present invention overcome the difficulties of balancing paired LVDT probes via provision of a quick and inexpensive process that can be implemented in either hardware or software. In particular, a software method is provid... | 09/01/1998 |
| 5777468 | Variable differential transformer system and method providing improved temperature stability and sensor fault detection apparatus A variable differential transformer system (10), both linear and rotary (L/RVDT) includes a primary coil (12) drive by a primary drive (20) having a triangle wave generator whose frequency is set by an external frequency control (Rosc and C | 07/07/1998 |
| 5767670 | Method and apparatus for providing improved temperature compensated output for variable differential transformer system A variable differential transformer system (10), both linear and rotary (L/RVDT) includes a primary coil (12) drive by a primary drive (20) having a triangle wave generator whose frequency is set by an external frequency control (Rosc and C | 06/16/1998 |
| 5717331 | Demodulator circuit for use with a displacement sensor to provide position information To allow a displacement sensor to operate independently of changes in the excitation signal to the transducer, a demodulating circuit utilizing a single integrator is provided wherein comparison is made between the excitation signal and a reference signal... | 02/10/1998 |
| 5661397 | Demodulator circuit for determining position, velocity and acceleration of displacement sensor independent of frequency or amplitude changes in sensor excitation signal To allow a displacement sensor to operate independently of changes in the excitation signal to the transducer, a demodulating circuit is provided wherein comparison is made between the excitation signal and a reference signal, the comparison is used to ad... | 08/26/1997 |
| 5621398 | Programmable switch A programmable switch includes a housing. A sensor is associated with the housing. The sensor senses a measurable physical property of a sensed element proximate the housing and developing an electrical signal varying relative thereto to represent the sen... | 04/15/1997 |
| 5477473 | Sensor-drive and signal-processing method A sensor-drive and signal-processing method, wherein the primary side of the sensor is supplied with a preferably oscillating input signal, and the output signal from the secondary side of the sensor is demodulated, if need be, filtered and amplified, is ... | 12/19/1995 |
| 5469053 | E/U core linear variable differential transformer for precise displacement measurement The present invention relates to a displacement sensor for measuring submicroinch displacements. An LVDT is constructed from an E core having a primary winding on the center pole piece and two secondary windings about two additional pole pieces. The E cor... | 11/21/1995 |
| 5440499 | Continuous duty press monitoring system A continuous duty press monitoring system includes a linear variable displacement transducer mounted to a press frame as to acquire data related to stresses and strains in the press housing due to completion of a press operation. First and second opposed,... | 08/08/1995 |
| 5327030 | Decoder and monolithic integrated circuit incorporating same A monolithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer. The interface circuit includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary ... | 07/05/1994 |
| 5239204 | Electronic proximity switch dependent upon a magnetic field An electronic proximity switch dependent upon a magnetic field includes an HF resonant circuit adapted to be influenced by an approaching magnetic trigger. A coil arrangement includes a member drivable into magnetic saturation, with the member including a... | 08/24/1993 |
| 5235274 | Pulsed excitation position sensor system using linear variable differential transducers with multiplexing A device for measuring the position of an element utilizing a linear variable differential transducer. The primary of the transducer is excited by using a single pulse, causing an induced pulse to be created at the secondary coil. The induced pulse is com... | 08/10/1993 |
| 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 measuring values, and an evaluating circuit for evaluatin... | 06/29/1993 |
| 5180979 | Position measurement sensor using a linear variable differential transformer with a triangular pulse input and output A position measurement device using a variable differential transducer. The primary of the transducer is supplied with a triangular pulse causing a similar pulse to be produced at the transducer secondary. The induced pulse is then compared with a constan... | 01/19/1993 |
| 5175541 | Evaluating circuit for inductive displacement pickup An evaluating circuit for an inductive pickup has a rectangular signal generator for outputing a rectangular signal, a driver stage for supplying a displaement pickup with an input signal produced from the rectangular signal, a phase-coupled rectifier ope... | 12/29/1992 |
| 5061896 | Variable transformer to detect linear displacement with constant output amplitude A variable transformer is disclosed. The transducer includes a uniform pitch winding wound on a hollow bobbin with several continuously variable concentric coils wound over it with layers of insulation in between. The variable coils are wound in accordanc... | 10/29/1991 |
| 4982156 | Position transducer apparatus and associated circuitry including pulse energized primary winding and pair of waveform sampled secondary windings This invention relates to transducers for indicating position. In particular, this invention relates to circuitry for accurately measuring either rotary or linear displacement of an inductive coupling member within a voltage displacement transformer (LVDT... | 01/01/1991 |
| 4937523 | Method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures A method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures. The system is formed of a linear inductive displacement sensor provided with a primary coil and two identical symmetrica... | 06/26/1990 |
| 4916391 | LVDT displacement sensor with signal noise reduction for use in weighing apparatus To weigh objects in quick succession, the objects are projected with a known horizontal velocity onto a ramp which has a surface which curves down through 90°. The ramp can move horizontally in response to the impulse corresponding to the change in horiz... | 04/10/1990 |
| 4904921 | Monolithic interface circuit for linear variable differential transformers A monlithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer. The interface circuit includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary w... | 02/27/1990 |
