|
Match
|
Document |
Document Title |
|
|
6034523 |
Method and arrangement for measuring a magnetic field using the Faraday effect, with compensation for intensity changes
Two light signals pass, in opposite directions, through a series circuit comprising a first optical fiber, a first polarizer, a Faraday sensor device, a second polarizer and a second optical fiber....
|
|
|
6018238 |
Hybrid non-contact clamp-on current meter
A magnetic core for a hybrid non-contact current meter having a magnetic core that is adapted for encircling a current carrying conductor wherein the magnetic core includes a first portion having a...
|
|
|
6008634 |
Electrical junction box
An electrical junction box includes an electrical circuit, a current sensor having a ferrite bead ring for generating a magnetic field according to a current flow in the electrical circuit and also...
|
|
|
5994899 |
Asymmetrical magneto-impedance element having a thin magnetic wire with a spiral magnetic anisotropy
A magneto-impedance element includes an amorphous wire having a spiral magnetic anisotropy. A dc-biased alternating current is supplied to the amorphous wire, whereby a voltage is produced between...
|
|
|
5986444 |
Device having a shaped, magnetic toroidal member and a magnetoresistive sensor for detecting low magnitude electrical currents
A device for detecting low magnitude electrical currents includes a generally toroidally-shaped member made of magnetic material that provides an air gap, and a magneto-resistive device in the form...
|
|
|
5973492 |
High accuracy optical current transducer thta eliminates birefringence
An improved magneto optical current transducer for measuring electrical current is taught that significantly reduces birefringence resulting from thermal transients and construction-induced...
|
|
|
5966008 |
Radio-interrogated, surface-wave technology current transformer for high-voltage systems
A radio-interrogated, surface-wave technology current transformer for high/medium-voltage systems includes a magnetosensitive element connected to a surface-wave structure of a surface-wave...
|
|
|
5959449 |
Process for the determination of electrical values without contacting
A method for determining electrical measurement variables (e.g. DC or AC voltages or currents, powers or resistances) without physically contacting a conductor (1) includes at least two coil...
|
|
|
5952819 |
Auto-zeroing current sensing element
A current sensor for sensing alternating current in a current-carrying conductor includes a substantially C-shaped magnetic core having first and second ends with a gap therebetween. A current...
|
|
|
5949231 |
Alternating current measuring device
The alternating current sensor has a transformer-like iron core structure, the circuit in which the current to be measured is connected to the primary winding (current input winding), the secondary...
|
|
|
5939876 |
Measuring device for a metal-enclosed, gas-insulated high-voltage installation
The measuring device is intended for a metal-enclosed, gas-insulated high-voltage installation. It contains at least one sensor (10, 11), arranged in an enclosure tube (3) of the metal enclosure...
|
|
|
5933000 |
Process and arrangement for measuring a magnetic field using the faraday effect with compensation for variations in intensity and temperature effects
Two light signals pass through a series connection of a first multimode optical fiber, a first polarizer, a Faraday sensor device, a second polarizer an a second multimode optical fiber in opposite...
|
|
|
5933003 |
Magnetoresistive wheatstone bridge with compensating current conductor for measuring an electric current
Measuring devices for determining magnetic fields to be used in particular for the potential-free measurement of the strength of an electric current which generates such a magnetic field. To...
|
|
|
5880583 |
Cryogenic current comparator based on liquid nitrogen temperature superconductors
A cryogenic current comparator device is based on the magnetic shielding properties of superconducting tubes and maintains electrical currents being compared in a highly exact integer ratio. One...
|
|
|
5847560 |
Process and device for measuring an alternating electric current with temperature compensation
Linearly polarized measuring light is broken down into two differently polarized component light signals in an analyzer after passing through a Faraday sensor device. The intensity of the...
|
|
|
5844410 |
Device for optically measuring physical quantity in power equipment and method of manufacturing the same
A device for optically measuring a physical quantity in power equipment includes an optical fiber associated with the power equipment, an optical part for transmitting/receiving light to/from the...
|
|
|
5844409 |
Method and system for measuring an electric current with two light signals propagating in opposite directions, using the Faraday effect
Method and system for measuring an electric current in a current conductor, two opposing light signals are transmitted through a Faraday element surrounding the current conductor and, after the...
|
|
|
5841272 |
Frequency-insensitive current sensor
An electrical device is capable of sensing both AC and DC current which is flowing through an electrical circuit. The electrical device bifurcates the current into separate paths, wherein impedance...
|
|
|
5834934 |
Inductive current sensor with reduced influence of spurious gaps and electrical apparatus including it
Inductive current sensor and electrical apparatus incorporating this sensor. The magnetic circuit of the sensor comprises a separable part carrying the detector element and is made of a material...
|
|
|
5834933 |
Method for magnetooptic current measurement and magnetooptic current-measuring device
Simple methods for magnetooptic current measurement and magnetooptic current-measuring devices are specified, which are independent of temperature influences on the measurement result and require...
|
|
|
5834931 |
RF current sensor
An RF sensor having a novel current sensing probe and a voltage sensing probe to measure voltage and current. The current sensor is disposed in a transmission line to link all of the flux generated...
|
|
|
5831425 |
Bus bar structure for electrical junction box
A bus bar structure which can detect current exceeding the rated allowance of the current sensor and which does not involve insertion of the bus bar, thereby increasing the current sensor detection...
|
|
|
5831426 |
Magnetic current sensor
A current determiner having an output at which representations of input currents are provided having an input conductor for the input current and a current sensor supported on a substrate...
|
|
|
5831424 |
Isolated current sensor
An improved isolated current sensing device. The invention consists of two magnetizable cores which surround the conductor carrying the current to be measured. The two cores are cyclically...
|
|
|
5814983 |
Method for sensing DC current and sensor for carrying out same
A method and sensor for accurately measuring DC current includes an electromagnetic circuit component, such as a current transformer, having a saturated state and an unsaturated state which...
|
|
|
5811965 |
DC and AC current sensor having a minor-loop operated current transformer
Current is sensed by a circuit which provides a high frequency reversing voltage to a sensing winding on a current transformer, for driving the transformer into its linear region at least once per...
|
|
|
5811964 |
Method and device for measuring an electrical alternating quanity with temperature compensation
A polarized measuring light is provided to a sensing means under the influence of an alternating electrical quantity, the polarization of the measuring light changing as a function of the...
|
|
|
5793196 |
Current transformer for measuring differential-mode and common-mode current
A measuring device for measuring time varying differential-mode currents flowing in first and second conductive groups includes a low reluctance magnetic circuit including first and second portions...
|
|
|
5767667 |
Magnetic core non-contact clamp-on current sensor
A magnetic core for a non-contact clamp-on current sensor having a magnetic core that is adapted for encircling a current-carrying conductor wherein the magnetic core includes a first portion...
|
|
|
5764047 |
Measurement of power supply dc current by means of a small ac current
An apparatus for measuring the dc current in a power supply circuit includes a transformer having a primary winding, a core and a secondary winding, a current generator, a pulse generator, and a...
|
|
|
5719494 |
Sensor assembly
A sensor assembly for measuring current I o is disclosed. The sensor assembly includes four magnetoresistive resistors (1, 2, 3, 4) arranged to form a Wheatstone bridge. The bridge is disposed...
|
|
|
5717327 |
Current sensor
A current sensor includes a current carrying bus bar configured to define a pair of electrically parallel current carrying paths each having a different cross-sectional area. A sensing device is...
|
|
|
5717388 |
Method for long term monitoring of magnetic fields
There is disclosed a methodology for measuring the magnetic field strengths of fundamental and harmonic frequencies associated with a.c. electrical current flows over a protracted period of time;...
|
|
|
5717326 |
Flat current sensor
A portable current measuring apparatus brings many current sensing devices close to a wire in order for the magnetic flux of the current within the wire to induce a current in the devices. The...
|
|
|
5696491 |
Self-excited microelectromechanical device
A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced...
|
|
|
5661396 |
Method for detecting digital carrier signals on twisted pair transmission lines
An improved method and apparatus for detecting signals on a twisted pair of transmission lines includes a sensor for nonintrusively coupling a portion of the signal to the apparatus. A filter is...
|
|
|
5656934 |
Optical method of measuring an alternating electrical current, including temperature compensation, and a device for carrying out the method
An alternating current in a conductor is measured using a Faraday element. The Faraday element is disposed around the conductor and linearly polarized light is supplied to the device. The plane of...
|
|
|
5652507 |
Apparatus and method for measuring an AC current which saturates the core of a current transformer
The dynamic range of a current transformer (CT) is increased without reducing the scaling of measurements at the low end of the dynamic range by designing the core of the CT to saturate only after...
|
|
|
5652506 |
Apparatus for measuring an a.c. current in a cable
An apparatus for measuring an a.c. current flowing in an electric cable comprises a pair of jaws for receiving the cable and which are movable towards one another to engage the opposite sides of...
|
|
|
5642041 |
Alternating current sensor employing parallel plates and having high dynamic range and accuracy
An alternating current sensor includes a first conductor plate, a second conductor plate positioned in spaced relationship relative to the first conductor plate and facing the first conductor...
|
|
|
5635831 |
Optical voltage and electric field sensor based on the pockels effect
An optical voltage/electric field sensor includes a crystal having a refractive index distribution which depends on an electric field applied thereto, wires for leading the electric field onto the...
|
|
|
5635829 |
Optical sensor
In an optical unit (a), a first polarizer, a first light wave phase modulator (a Pockels device), a second light wave phase modulator, and a second polarizer are arranged in this sequence. A...
|
|
|
5635830 |
Optical magnetic field sensor employing differently sized transmission lines
A magneto-optical element is of a rare-earth iron garnet crystal expressed at least by formula 1, and a element in whose composition range the value of X is set at 0.8≤X≤1.3; that of Y at...
|
|
|
5629616 |
Circuit for measuring current in class-d amplifiers
A circuit accurately measures the current flowing in a load which is powered by a pulse-width modulated (PWM) arrangement. The current measurement circuit is transformer-coupled to the load. A...
|
|
|
5621377 |
Sensor assembly for measuring current as a function of magnetic field gradient
To measure magnetic field gradients is difficult because sensor elements available for this have only a limited linearity range due to their sensitivity which is strongly dependent on the...
|
|
|
5617019 |
Inductive measuring device for measuring alternating current components superposed to a high direct current
A direct current of high intensity having alternating current components superposed thereon is flowing in a conductor 1 through a magnetic circuit 5, 6. Two measuring coils 7, 8 are arranged inside...
|
|
|
5617020 |
Microelectromechanical-based power meter
A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced...
|
|
|
5594331 |
Microelectromechanical powerline monitoring apparatus
A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced...
|
|
|
5568047 |
Current sensor and method using differentially generated feedback
A current sensor has one signal interface channel including a transformer having a primary winding, a secondary winding and a feedback winding. A magnetic core magnetically couples the primary...
|
|
|
5565836 |
Nullification of magnetic fields relative to coils
The internal and/or external magnetic fields of a coil are nullified to ad structurally detrimental Lorentz Forces and/or environmentally hazardous magnetic fields, in accordance with...
|