Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7245121 | Device and method for determining the path of a target The invention relates to a device for determining the path of an in particular metallic target, with at least two detection devices so positioned along a path to be monitored that the sensitivity curves of immediately adjacent detection devices at least partly overl... | 07/17/2007 |
| 7221151 | Magnetic array position sensor A sensor apparatus and method that can measure either a linear position or an angular position of a device. A linear array of galvanomagnetic sensing elements is fixedly mountable adjacent the device. A target is connectable to the device such that the target moves ... | 05/22/2007 |
| 7075293 | Method for inductive distance measurement, and a working head for carrying out this method using an induction coil An inductive measurement is carried out of the distance between a workpiece (3) and a working head (1), which bears an induction coil (8), through which an alternating current flows and which is part of a resonance circuit whose oscillation freq... | 07/11/2006 |
| 7075329 | Signal isolators using micro-transformers A logic signal isolator comprising a transformer having a primary winding and a secondary winding; a transmitter circuit which drives said primary winding in response to a received logic signal, such that in response to a first type of edge in the logic signal, a si... | 07/11/2006 |
| 7064538 | Magnetic sensor digital processing interface for electrical motor application A system and methods for an interface for magnetic sensors to determine a rotational angle has been achieved. This interface can be used for magnetic sensors providing analog signals of the sine and cosine values of the angle to be determined. Analog signals are bei... | 06/20/2006 |
| 6920411 | Method for configuring an operational characteristic of a proximity sensor A proximity sensor has a resonant circuit which when stimulated by a pulse produces a signal with decaying oscillations. The number of such oscillations above a signal threshold varies in relation to the distance between a metal object and the proximity sensor. The ... | 07/19/2005 |
| 6911829 | Inductive signature measurement circuit An apparatus for measuring the inductance of a wire-loop with noise-cancellation, auto-calibration and wireless communication features, or detector circuit. The apparatus measures the effective change in inductance induced in a wire-loop as a vehicle passes over the... | 06/28/2005 |
| 6850058 | Offset and low frequency noise insensitive magnetic sensor The invention provides an offset and low frequency noise insensitive magnetic sensor which incorporates a magnetic field effect transistors (MagFETs). Methods of improving the signal to noise ratio and reducing errors from offsets when measuring magnetic fields usin... | 02/01/2005 |
| 6657476 | AC-coupled sensor signal conditioning circuit A method and apparatus for minimizing errors in a sensor device due to signal amplitude variation are disclosed herein. A signal output from the sensor device is amplified and, thereafter, AC-coupled to a comparator such that the amplification and AC-coup... | 12/02/2003 |
| 6534969 | Offset-compensated angle measuring system In a device for measuring an angle $c; between a magnetic field and an MR sensor (1) which supplies at least two electrical sensor signals x and y mutually 90° phase-shifted, which are supplied to an A/D converter (4) whose output is connected to an a... | 03/18/2003 |
| 6297673 | Evaluation circuit for electronic signal transmitters The evaluation circuit has a current interface (1,1'; 11,11') for a current signal (i2) from an electronic signal transducer (6,6'; 16,16'); a current-sensing FET (3,3'; 13,13') having a gate (G), a source (S), a drain (D) and a sensing output ... | 10/02/2001 |
| 6208176 | Adaptive driver circuit for semiconductor magnetoresistors An adaptive driver circuit which uses a modified conventional current mirror circuit to provide a current source employing an automatically adjustable current to compensate for decreased SMR device sensitivity at higher temperatures and large air gaps wit... | 03/27/2001 |
| 6191576 | Method of operating or constructing a geartooth sensor A geartooth sensor utilizes an algorithm for establishing an adaptive threshold for the switch point of the sensor to minimize drift in the point at which the sensor output changes in relation to the target features it is tracking. The algorithm utilizes ... | 02/20/2001 |
| 6183859 | Low resistance MTJ A low resistance magnetic tunnel junction with low resistance barrier layer and method of fabrication is disclosed. A first magnetic layer of material with a surface is provided and a continuous layer of material, e.g. aluminum, is formed on the surface o... | 02/06/2001 |
| 6160322 | Pulse signal generation method and apparatus A pulse signal generator comprises a magnetic element capable of causing a large Barkhausen jump, a detector provided in relation to the magnetic element, a magnetic field source provided in the vicinity of the magnetic element to produce a biasing magnet... | 12/12/2000 |
| 6097129 | Electronically commutated motor An electronically commutated external rotor motor has an external rotor having a cup-shaped housing and a radially magnetized permanent magnet connected in the cup-shaped housing. An interior stator is positioned in the cup-shaped housing. The interior st... | 08/01/2000 |
| 6087882 | Ultra-low power magnetically coupled digital isolator using spin valve resistors An isolator having a driver circuit which is responsive to an input signal to drive signals into a magnetic-field generator such as at least one coil. The generator is magnetically coupled to a sensor that includes spin-valve resistors which have resistan... | 07/11/2000 |
| 5952824 | Magnetic detecting apparatus with giant magnetoresistive sensing element and level shifting waveform processing circuit A magnetic detecting apparatus is capable of performing accurate waveform processing without being affected by noise signals or the like, the level shifting circuit thereof having a fixed voltage shift so as to be free of varying amplitudes of analog sign... | 09/14/1999 |
| 5801533 | Method and apparatus with cascode biasing magneto field effect transistors for improved sensitivity and amplification Cascode coupled magnetic field effect transistors used to measure magnetic field. The disclosed cascode coupled MagFET circuit includes cascode coupled transistors used to equalize the voltage at the drains of the MagFET resulting in a differential Hall c... | 09/01/1998 |
| 5760581 | Method and apparatus coupling together magneto field effect transistors in series to accumulate the effects of magnetic field for improved sensitivity and linearity A circuit including daisy chain coupled triple drain magneto field effect transistors (MagFETs) for measuring magnetic field. The disclosed method and apparatus describe multiple MagFETs coupled together to accumulate voltage differentials generated in re... | 06/02/1998 |
| 5744950 | Apparatus for detecting the speed of a rotating element including signal conditioning to provide a fifty percent duty cycle A sensor for determining the rotational speed of a rotating element. The sensor includes a giant magnetoresistive ratio sensing device which is magnetically coupled to the rotating element and includes an output terminal. The sensing device generates an o... | 04/28/1998 |
| 5627490 | Amplifier circuit An amplifier circuit for amplifying a change in a resistance value of a magnetic resistance element is formed by connecting a first and a second current mirror circuits having the same structure in cascode, so that a voltage change is amplified without us... | 05/06/1997 |
| 5585719 | Magnetoresistance effect element sensor and an electronic circuit therefor A magnetic sensor including a magnetoresistance effect element directed to prevent deterioration in the detection sensitivity occurring due to inversion of the magnetization of a plurality of ferromagnetic thin film stripes forming the magnetoresistance e... | 12/17/1996 |
| 5559454 | Circuit arrangement for signal processing for inductivity using sensor A switching arrangement for a signal processing comprises a sensor for sensing a movable part and having an inductivity, and a control reflecting circuit connected with the inductivity of the sensor, the current reflecting circuit having a transistor with... | 09/24/1996 |
| 5548242 | Waveform shaping circuit A waveform shaping circuit shapes a waveform by comparing an output signal generated by an electromagnetic coil in response to a change in an incident magnetic flux to a reference voltage in a comparator. The circuit prevents waveform shaping error due to... | 08/20/1996 |
| 5500590 | Apparatus for sensing magnetic fields using a coupled film magnetoresistive transducer A first magnetically coupled film sensing element and a second magnetically coupled film sensing element are arranged to change resistance in response to a magnetic filed when biased by a current through the elements. A current carrying conductor spaced f... | 03/19/1996 |
| 5497084 | Geartooth sensor with means for selecting a threshold magnitude as a function of the average and minimum values of a signal of magnetic field strength A geartooth sensor is provided with a circuit which determined a threshold magnitude as a function of the minimum value of a first output signal from a magnetically sensitive component and an average output signal from a magnetic sensitive component. Circ... | 03/05/1996 |
| 5493218 | Magnetic detecting apparatus with a variable voltage power supply A magnetic detecting apparatus including a magnetic sensor for detecting the displacement of a member which is detected by a variation in the voltage, a sampler for sampling the voltage detected by the magnetic sensor at the required period, and a voltage... | 02/20/1996 |
| 5489846 | Magnetic-field sensor with split-drain MOSFETS A magnetic-field sensor has an array of split-drain transistors connected in parallel, each having a first, a second, and a third drain electrode, and a negative reference current generating transistor. A biasing circuit is utilized to bias the split-drai... | 02/06/1996 |
| 5483162 | Magnetic detector for a frequency generator responsive to motor rotation A magnetic detector, such as is used in a frequency generator, for detecting the rotational rate of a motor includes magnetic resistance elements and an operational amplifier. The magnetic resistance elements have a predetermined resistance ratio and are ... | 01/09/1996 |
| 5471736 | Magnetic sensor with laminated field concentrating flux bar An improved magnetic sensor for use in measuring the position, velocity and/or direction of movement of an object having alternating zones of different magnetic conductivity in the direction of movement, comprises a permanent magnet member having a pole f... | 12/05/1995 |
| 5453690 | Squid magnetometer in which feedback current for a squid flux-locked-loop is conductively coupled into the input circuit of the squid The feedback current for the flux-locked-loop of a DC-SQUID is conductively supplied directly to the input circuit of the SQUID rather than to a separate feedback or modulation coil that is inductively coupled to the SQUID, thereby eliminating the feedbac... | 09/26/1995 |
| 5440232 | System for monitoring and analyzing field energy exposure A portable electromagnetic field exposure dosimeter includes a triaxial fite-loaded coil sensor, a group of amplifiers and bandpass filters, a data control board, and a computer. The triaxial sensor receives electromagnetic radiation along three orthogon... | 08/08/1995 |
| 5424641 | SQUID fluxmeter having a pulse mulliplication circuit number for accurately measuring large rates of change in flux A SQUID fluxmeter, which object is to accurately measure magnetic flux even if the input magnetic flux is largely changed in a short time, includes an 1-input superconducting OR gate for outputting pulses to the number of i in response to one input pulse ... | 06/13/1995 |
| 5420100 | Planar squid magnetometer with inductively coupled microstrip resonator A planar SQUID magnetometer for detection and measurement of an applied magnetic flux is disclosed wherein a planar microwave-resonant element overlaps a Josephson device incorporated in a high-Tc superconducting, thin-film SQUID device, thereb... | 05/30/1995 |
| 5414412 | Frequency dividing transponder, including amorphous magnetic alloy and tripole strip of magnetic material In an electronic article surveillance (EAS) system, a frequency-dividing transponder that responds to detection of electromagnetic radiation of a first predetermined frequency by transmitting electromagnetic radiation of a second predetermined frequency t... | 05/09/1995 |
| 5402064 | Magnetoresistive sensor circuit with high output voltage swing and temperature compensation A magnetoresistor (MR) and a non-magnetoresistor (NMR) are formed of indium antimonide or other magnetoresistive material in thermal proximity to each other on an integrated circuit substrate (100). Hall effect shorting strips (104) are formed on the magn... | 03/28/1995 |
| 5394105 | Device for contactless energy and data transmission In integrated storage circuits which receive energy only via a coil in a contactless manner and which also execute the data exchange, the integrated storage circuit loads the coil to a greater extent dependent upon the data read. It is possible to detect ... | 02/28/1995 |
| 5355085 | Multichannel SQUID flux meter having multiplexed SQUID flux sensors A plurality of SQUID flux sensors are supplied with their respective bias currents at the same time from a bias source. A superconducting multiplexer multiplexes output signals of the SQUID flux sensors during an interval of time when the bias currents ar... | 10/11/1994 |
| 5352978 | Apparatus for sensing a magnetic field with a superconductive material An apparatus of sensing a magnetic field using a ceramic superconductor magneto-resistive element having a superconductor magneto resistive effect of non linear characteristic against the applied magnetic field, there is provided a coil for applying a bia... | 10/04/1994 |
