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5483161 |
Faraday effect continuous circuit flux concentrating magnetic field sensor
A general-purpose magnetic field sensor capable of sensitively measuring uniform magnetic fields includes a magneto-optic (Faraday-effect) sensor and a flux concentrator. Both the magneto-optic...
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5479094 |
Polarization insensitive current and magnetic field optic sensor
A sensor system includes a sensor head, an optical source, and a measurement apparatus. The sensor head includes a beamsplitter having first, second, third, and fourth ports, the beamsplitter being...
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5479106 |
Electro-optic voltage detector
To provide an E-O probe which can measure a voltage distribution in a fine region while enlarging it. A grounded, transparent electrode 2 and an electrooptic member 3 such as LiTaO 3 are...
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5477134 |
Voltage sensor for use in optical power transformer including a pair of Pockels cells
A voltage sensor is composed by arranging along the optic axis, successively from the side of incident light, a first polarizer, a Pockels cell for detection, a Pockels cell for modulation, and a...
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5475300 |
Variable color digital multimeter
A measuring instrument comprises a DC section for processing DC signals, an AC section for processing AC signals, and an OHMS sections for performing resistance measurements. A first switch is...
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5475298 |
Method and apparatus for measurements dependent on the faraday effect using polarized counter-propagating light
Measurements, particularly of current, using the Faraday magneto-optic effect in an optical fibre, have suffered from inaccuracy due to vibration causing linear birefringence in the fibre. Current...
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5465043 |
Non-contact type probe and non-contact type voltage measuring apparatus, wherein the probe's irradiation surface is coated with a conductive film having a pinhole
To enable the measurement of the absolute voltage of the wiring under test with no cross-talk and without depending on the gap interval between the probe tip and-the wiring under test....
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5463311 |
Apparatus and method for measuring operating voltage electrical signals in a high voltage environment
A test system 100 for performing electrical testing in a high voltage or inhospitable or inconvenient environment 150 electrically isolates a measurement detector 130 located within the environment...
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5461307 |
Electro-optical current sensing system and method for sensing and avoiding thermally induced measurement error therein
An electro-optics current sensing system for sensing and avoiding thermally induced measurement errors in a current sensor includes a beam generator, such as a light emitting diode or a laser...
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5459394 |
Electro-optic measurement device for the measurement of an electric signal in an electronic component
An electro-optical measurement device for the sampling of an electric signal (SI) in an electronic component by means of a radiation beam. Special embodiments of the electro-optic measurement...
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5451864 |
Magneto-optical sensor
An optical sensor includes: a light irradiation source for irradiating linearly polarized light having a wavelength of 740 to 890 nm; a magneto-optical element having a composition of Y 3 -x Tb x ...
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5451863 |
Fiber optic probe with a magneto-optic film on an end surface for detecting a current in an integrated circuit
An apparatus and method for measuring the current distribution in an integrated circuit with high time resolution is described incorporating a magneto-optic film, a linearly polarized light beam...
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5450006 |
Apparatus and methods for measuring magnetic fields and electric currents
Apparatus for sensing or measuring a magnetic field comprises a light source (10) for generating light having at least a component which is polarized, a sensing element (16) arranged to transmit...
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5448161 |
Transformer-coupled photodiode circuit for lightning and other light pulse detection
An efficient optical radiation detector for lightning or other light signals such as pulses, bursts, flashes, and steady fluctuations. A silicon photodiode (or similar light-sensitive silicon...
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5446381 |
Optical voltage electric field sensor
An optical voltage electric field sensor of the type which includes a light source, a polarizer for linearly polarizing an incident light beam emanated from the light source, a phase plate for...
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5444365 |
Voltage measuring apparatus having an electro-optic member
A change in voltage can be sensitively detected at a local part of a measured object. A set of laser medium and E-O probe are disposed between a pair of mirrors, a first one and a second one,...
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5442281 |
Method and apparatus for deriving power consumption information from the angular motion of a rotating disk in a watt hour meter
An apparatus for recording information about the angular motion of a rotatable disk disposed in a first structure is provided. The disk has regions with differing properties with respect to...
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5442300 |
Ultrafast electrical scanning force microscope probe
An ultrafast scanning probe with 2.5-picosecond response time and 10-nanometer spatial resolution. In one embodiment, a single probe tip is formed on an input electrode layer which is at least...
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5442297 |
Contactless sheet resistance measurement method and apparatus
A contactless sheet resistance measurement apparatus and a method for measuring the sheet resistance of a desired layer of a first conductivity type, formed upon a substrate of an opposite...
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5420413 |
Actuator with an optical position sensor using a variable magnetic field
An actuator having an optical position sensor is disclosed. The sensor remotely provides via a single optic fiber light having two spectral frequencies of about equal intensities to two inversely...
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5420502 |
Fault indicator with optically-isolated remote readout circuit
A fault indicator for indicating at local and remote locations the occurrence of a fault current in a conductor of an AC power distribution system utilizes a liquid crystal display having...
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5420715 |
RF/optical modulator-demodulator
A modulator or demodulator has a transparent nonlinear dielectric material (crystal), and an optical fiber for coupling light thereinto. RF is coupled into the crystal by a dielectric waveguide...
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5416860 |
Method and apparatus for optically measuring electric current and/or magnetic field with temperature compensation
A system for measuring the strength of fiber optical current in an AC magnetic field by adopting Faraday effect and temperature compensation. In general, the current measurement systems that adopt...
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5414374 |
Method for particle beam testing of substrates for liquid crystal displays (LCD)
Method for particle beam testing of substrates for liquid crystal displays (LCD). This is directed to methods wherein, given a substrate (SUB1) for a liquid crystal display, either potentials or,...
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5412328 |
Non-contact current injection apparatus and method for use with linear bipolar circuits
The present invention relates to a non-contact current injection apparatus and a method for using the same with linear integrated bipolar circuits. The current injection apparatus has two modes: a...
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5412330 |
Optical module for an optically based measurement system
An optical module for an optically based measurement system, such as an electro-optic system (10) for measuring electrical characteristics of a device under test (14), has a probe arm (26), a layer...
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5410246 |
Method for detection of a marked element in proximity to a sensor
A method for detecting a marked element on an eddy wheel in proximity to a sensor is described. The method includes the steps of accumulating sensor output signals over a selected time period. The...
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5410243 |
Three-phase collected type optical current transformer
A three-phase collected type optical current transformer having a common hermetically sealed container miniaturized in its radial direction. The common hermetically sealed container incorporating...
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5406213 |
Instrument for testing liquid crystal display base plates
An instrument for testing defects on active matrix liquid crystal display base plates used for liquid crystal display panels. The instrument includes a testing device having an electro-optical...
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5406194 |
Al.sub.x Ga.sub.1-x as probe for use in electro-optic sampling
A new electro-optic sampling probe with femtosecond resolution suitable for ultra-fast electro-optic sampling. The new probe is several times thinner and has a dielectric constant four times less...
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5406195 |
Phase-to-phase voltage monitor for three-phase power distribution system
A voltage monitoring device for a three-phase ungrounded delta-connected power system utilizes liquid crystal optical shutter devices capacitively coupled between phases of the system such that the...
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5399853 |
Optical sensor arrangement using dual mode devices
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...
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5396166 |
Fiber optic interferometric electric field and voltage sensor utilizing an electrostrictive transducer
A fiber optic interferometer sensor system utilizing a fiber optic interferometer with an elecrostrictive transducer bonded to one of first and second optical fiber arms of the interferometer for...
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5394098 |
Apparatus including electro-optical material for use in testing a circuit having voltage-bearing elements proximate a surface of a body
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...
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5389782 |
Optically powered amplifier used by an electromagnetic field sensor to amplify an electrical signal from an antenna
An electromagnetic field sensing apparatus which detects an incoming electromagnetic field and provides an RF electrical signal indicative of the strength of the field. The electromagnetic field...
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5384534 |
Self-powered electro-optic rotational position sensor with magnetic pickup
An indicating system for measuring movement of a material, having a magnetic pickup device, waveform conditioning circuit and light signal emitter functioning under the system's own self-made...
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5382901 |
Optical magnetic field sensor capable of precise measurement without temperature induced errors
An optical magnetic field sensor is provided that can precisely measure a magnetic field strength without measuremental errors caused by temperature change. The sensor includes a light source, a...
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5365175 |
Method of locating ground faults
The present invention discloses a method of detecting and locating current imbalances such as ground faults in multiwire systems using the Faraday effect. As an example, for 2-wire or 3-wire (1...
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5357194 |
Testing bed and apparatus including same for testing printed circuit boards and other like articles
A testing bed for use in testing printed circuit boards and the like includes a light-transmissive supporting member, a plurality of spaced strips of light-transmissive, electrically-conductive...
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5343036 |
Optical measurement of electrical quantities using inverse piezoelectric effect with dual double-mode fiber
In a fiber-optic sensor for measuring electric fields and voltages, in place of a double-mode fiber extending between sensor head (15) and evaluating unit (14) two separate, similar double-mode...
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5339255 |
Method of controlling synthesis reaction
A method for controlling synthesis reaction of a synthetic high molecular resin, the method measuring continuously an infrared spectral absorption of a reaction intermediate product of...
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5339026 |
Fiber-optic sensor with first and second bimode fibers
In a fiber optic sensor for measuring electric fields and voltages, in place of a bimode fiber extending between sensor head (14) and evaluation unit (13) two separate bimode fibers (4a, 4b) of the...
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5334831 |
Proximity detector for detecting position of a target
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...
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5331272 |
Optical sensor for detecting an electric field via the Faraday effect
The optical electric current sensor is composed of a birefringent light guide (2) coiled around an electric current conductor (1) and is characterized by a spatial modulation of the magnetic field...
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5331275 |
Probing device and system for testing an integrated circuit
A probing device includes a minute probe in which at least an end portion is formed by conductive material, a cantilever having one end to which the probe is attached, and another end fixed to a...
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5311137 |
Liquid crystal electric field tester for circuit boards
A nondestructive noninvasive device and method for testing printed circuit boards (PCBs) through the utilization of a liquid crystal material which visually images the electric fields of the PCBs....
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5304920 |
Optical current transformer
In an optical current transformer in which the Faraday rotation of light in a waveguide (2) enclosing the current is measured, the waveguide (2) is designed as an integrated-optics single-mode...
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5302883 |
Automated apparatus and method for the reproduction of same color temperature luminous intensity standard light source
"Voltage-distance convergence method" is utilized in an automated apparatus and method for the reproduction of same color temperature luminous intensity standard light source thereby the adjustment...
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5301127 |
High speed method for predicting radio-wave propagation
Radio-wave propagation is rapidly predicted by a hybrid computational method that uses Ray Optics techniques to calculate radio field strength above a limiting radio-wave ray, Parabolic Equation...
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5296803 |
Watt-hour meter cover with battery hatch/reset switch and optical communication port
A watt-hour meter cover is provided which has an optical coupler including a conduit, lens, and means for engaging an external programmer/reader. The conduit is has improved signal transmission...
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