|
Match
|
Document |
Document Title |
|
|
5295207 |
Optical apparatus for measuring current in a grounded metal-clad installation
An optical transformer designed to equip a grounded metal-clad installation, wherein the transformer includes a disk which is disposed transversely to the axis of the cladding and which is provided...
|
|
|
5289114 |
Voltage detection apparatus using short pulse light source with narrow spectral band width
A light source for emitting a pulsed laser beam having an ultrashort pulse width and a voltage detector including the light source therein. The light source includes a laser driving unit for...
|
|
|
5281909 |
Process and system for measuring the course of a signal at a point of measurement on a sample
A process and a system for measuring the temporal course of a recurring signal at at least one site of, measurement of a sample, the sample being impinged upon by a primary corpuscular beam and a...
|
|
|
5280173 |
Electric and electromagnetic field sensing system including an optical transducer
A method and apparatus for sensing electric and electromagnetic fields incorporating a fiber-optic transducer which mounts directly on a conventional optical fiber waveguide. The transducer employs...
|
|
|
5274325 |
Method and apparatus for electro-optic sampling measurement of electrical signals in integrated circuits
A method for electro-optic sampling measurement of electrical signals in integrated circuits, capable of improving the reproducibility of the measurements and calibrating the voltage accurately....
|
|
|
5273610 |
Apparatus and method for determining power in plasma processing
An apparatus and method including a current sensor having a radiation emitter, such as an electrical resistor, and a radiation detector, such as an infrared detector, for sensing current flowing to...
|
|
|
5274324 |
Hot line mountable hotline indicator having liquid crystal display with resettable memory function
A hot line indicator for instantaneously indicating the presence of voltage on an electrical conductor in an AC power distribution system includes a unitary one-piece housing having a projecting...
|
|
|
5272433 |
Polarmetric electric field sensor with electro-optical crystal cut disposed to measure electric field direction
A polarimetric directional field sensor comprises an emitter and receiver (1) of measurement signals, connected by optical fibers (2, 2a, 2b) to a portable probe (3). The probe (3) comprises an...
|
|
|
5272434 |
Method and apparatus for electro-optically testing circuits
Electro-optical in-circuit testing, especially of large circuits such as those assembled on printed circuit boards, is achieved in an automatic test system by disposing an electro-optical sensor in...
|
|
|
5270643 |
Pulsed laser photoemission electron-beam probe
An electron-beam test probe system (400) in which a pulsed laser-beam source (404) and a photocathode assembly (430) are used with an electron-beam column (426) to produce a pulsed electron beam at...
|
|
|
5268635 |
Intelligent self-diagnosing and sparing light emitting diodes
Visual indication of an operational condition on a printed circuit board by utilizing a pair of LEDs for each operational indication and by utilizing each LED of a pair to verify that the other LED...
|
|
|
5268634 |
Electro-optical control system
An electro-optical control system having a multi-key keypad, an alpha-numeric display, means for periodically generating a pulsed light beam, means for detecting a portion of the light beam to...
|
|
|
5268633 |
Testing operation of electric energy meter optics system
A method and apparatus for testing the proper operation of the optical elements in the optical detection circuit of an electronic register in an energy meter. The light emitter circuit is...
|
|
|
5267336 |
Electro-optical sensor for detecting electric fields
The invention relates to an electric field sensor useful in detecting and measuring wideband transient electrical responses by means of an integrated optical waveguide interferometer. Mach-Zehnder...
|
|
|
5260648 |
Process and system for rapid analysis of the spectrum of a signal at one or several points of measuring
In electron beam measuring, it is often also necessary to measure the frequency range in addition to the measuring time range. In order to do this, according to the invented process, the output...
|
|
|
5256872 |
Device for measuring current by optic fiber and dual polarization analysis
The device measures the current intensity in a conductor by FARADAY effect in a monomode optic fiber. It comprises a separator-polarizer formed for example by two coplanar half-disks of polarizing...
|
|
|
5256968 |
Measurement of high-frequency electrical signals by electro-optical effect
A system for measuring an electrical signal in a frequency range substantially equal to the bandwidth the signal close to the gigahertz includes two laser sources. A first laser source emits a...
|
|
|
5247244 |
Electro-optic voltage measuring system with temperature compensation
As the dielectric constant and the halfwave voltage of electro-optic crystals having a fourfold axis of rotary inversion are oppositely dependent on the absolute temperature, but their product is...
|
|
|
5243293 |
System utilizing optical current sensors for detecting fault location in substation
A system for detecting a fault occurred within a substation and judging a location of the fault including optical current sensors each having a Faraday element arranged on a top of an insulator...
|
|
|
5241306 |
System and method for introducing meter sensor hysteresis
A method and system for accurate remote reading of an electricity meter including an optical detection arrangement, including a light emitter and sensor, have positioned in the light path...
|
|
|
5237265 |
Fiber optics arrangement for measuring the intensity of an electric current
In the case of a fiber optics arrangement for measuring the intensity of an electric current while utilizing the Faraday effect in which the magnetic field surrounding the conductor 1 through which...
|
|
|
5233291 |
Method of and apparatus for measuring electric characteristics of semiconductor wafer
A method of measuring C-V characteristics of a semiconductor wafer without forming an electrode on an oxide film thereof. An electrode 201 for C-V measurement is held above a semiconductor wafer...
|
|
|
5227715 |
Apparatus for measuring electromagnetic field intensity using dual polarized light beams
An electromagnetic field intensity measuring apparatus capable of measuring an electromagnetic field intensity accurately and sensitively without affection by any disturbance, including a measuring...
|
|
|
5226107 |
Apparatus and method of using fiber-optic light guide for heating enclosed test articles
An apparatus and method for providing a specified amount of heat on a test specimen, a portion of a specimen, or multiple specimens, under space-like conditions. This system includes a vacuum...
|
|
|
5216359 |
Electro-optical method and apparatus for testing integrated circuits
Internal test sites on integrated circuit chips may be tested with minimal input/output pad or chip area overhead by providing transient interconnections to the internal test sites using an...
|
|
|
5210407 |
Electric field intensity detecting device having a condenser-type antenna and a light modulator
An apparatus measures the intensity of an electric field with a compact sensor equipped with a light modulater of a Mach-zender interferometer type and a condenser-type antenna. The sensor...
|
|
|
5208531 |
Apparatus and method for testing integrated circuits
An apparatus and method for testing an integrated circuit (12) generally comprises an input pad (14) and output pad (15) having photo-sensitive sensors (20, 46) formed thereon for eliminating the...
|
|
|
5208541 |
Spark plug firing sensor with capacitive coupling and optical pickup
A sensor for detecting the firing of a spark plug while maintaining electrical isolation of electronic equipment is disclosed. In the preferred embodiment, a conductive element is attached to one...
|
|
|
5202629 |
Optical magnetic-field sensor having an integrally bonded magnetooptical element, polarizer, analyzer and substrate
An excellent optical magnetic-field sensor having a magnetooptical element, a polarizer, an analyzer and a substrate is provided which can decrease light loss as well as temperature dependency of...
|
|
|
5196695 |
Fiber-optic sensor having near-field and remote-field signals
In a fiber-optic sensor for alternating electric fields or voltages, the interference in a bimodal fiber (3) is measured passively. To this end, the mutually phase-shifted near-field and...
|
|
|
5185675 |
Electro optic modulator systems for fiber optic information transmission
A system for transducing a signal voltage into an optical signal, transmitting the optical signal via an optical fiber to a remote location in the form of light attenuation frequency and...
|
|
|
5181026 |
Power transmission line monitoring system
An Electric Power Line Monitoring System in which a single line measuring system station can measure all of the power parameters of both voltage and phase angle plus ambient and line temperatures....
|
|
|
5175492 |
Calibration and error correction for electrical-source-to-E/O-device impedance mismatch and O/E-device-to-electrical-receiver impedance mismatch in a lightwave component analyzer
A lightwave component analyzer including at least an internal optical receiver and preferably also including an internal optical source which are selectively connectable by switches configurable by...
|
|
|
5171981 |
Fiber-optic voltage sensor with cladded fiber and evanescent wave variation detection
A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across...
|
|
|
5170127 |
Capacitance imaging system using electro-optics
An unassembled simple matrix liquid crystal display (LCD) panel, with strips of highly-conductive material, is tested by extracting a two-dimensional image of the capacitance distribution across...
|
|
|
5166610 |
Dual range speed indicator with acceleration display
A solid state speed indicator for railroad locomotives is provided with a plurality of indications in addition to speed. These include an acceleration indicator and an overspeed indicator. In...
|
|
|
5164667 |
Voltage detecting device
A voltage detecting device using an electro-optical material with a refractive index which is changed by a voltage at a part of an object comprising a light source, comprises an electro-optical...
|
|
|
5164664 |
Method for the optical measurement of electrical potentials
The optical absorption edge of a semiconductor is shifted toward lower photon energies in an electrical field. The method of the invention utilizes this electro-absorptive effect in order to...
|
|
|
5164662 |
Detection of radio frequency emissions
A method and system for detecting radio frequency emissions in an electrical machine, by: sensing the radio frequency emissions and deriving a light signal modulated by the radio frequency...
|
|
|
5157327 |
Method and apparatus for electro-optically measuring a voltage signal
A method and apparatus for measuring an electro-optic voltage signal generated in response to an applied voltage signal at a select dot contact of an electro-optic crystal. The applied voltage...
|
|
|
5157324 |
Improved electro-optical crystal
A Pockels effect electric field sensor includes, as a sensitive element, a crystal with electro-optic properties traversed by a luminous beam with specific polarization and propagation directions....
|
|
|
5153427 |
Optical d.c. voltage transformer
An optical d.c. voltage transformer having an electrooptic medium to which a d.c. electrical field or voltage to be measured is to be applied. The electrooptic medium affects the polarized light...
|
|
|
5150051 |
Home gaussmeter with filter-integrator circuit for measuring elf radiation
A meter (10) for measuring extremely-low-frequency radiation includes a coil circuit (22) whose output is filtered by a sharp-cut-off high-pass filter (24) to pass standard house-current...
|
|
|
5149962 |
Proximity detector using faraday effect and bidirectional transmission
A proximity detector apparatus that uses the Faraday Effect to detect position changes of a target. The proximity detector includes a permanent magnet having a magnetic field that changes as the...
|
|
|
5150043 |
Apparatus and method for non-contact surface voltage probing by scanning photoelectron emission
An apparatus and method for non-contact sensing electrical potentials of selected regions on the surface of a sample are provided. A typical sample is an integrated circuit, electronic device, or...
|
|
|
5142224 |
Non-destructive semiconductor wafer probing system using laser pulses to generate and detect millimeter wave signals
Electrical devices are characterized by optically triggering an electrical signal onto the device and then optically sampling the electrical signal waveform on the device.
|
|
|
5140156 |
High sensitivity optical magnetic field sensors having a magnetooptical garnet-type ferrite polycrystal
A high sensitivity optomagnetical sensor comprising a light source, a magnetic field-detecting section, a light-receiving section for receiving light emitted from the light source through the...
|
|
|
5140155 |
Fiber optic sensor with dual condition-responsive beams
An optical fiber (12) extends from a light source (10) along a beam (16) of a sensor (18). The optical fiber terminates in a free end adjacent a free end of the beam and generally opposite to a...
|
|
|
5136235 |
Rugged fiber-optical current sensor based on the Faraday effect
A fiber-optical current transformer including a sensor coil, operated in reflection mode, with a sensor fiber (5) for detecting a current utilizing of the Faraday effect. A light source (1) couples...
|
|
|
5136236 |
Arrangement for voltage measurement in a GIS installation
In a gas-insulated switchgear having an isolated-phase bus, a current-carrying bus (2) with a given external radius R 1 is arranged coaxially in a cylindrical enclosure with a given external...
|