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5134362 |
Apparatus for detecting failure in power system
At both ends parts of a specified section of a high tension line and close to it, a first Faraday device and a second Faraday device are disposed, and an output end of the first Faraday device is...
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5134359 |
Apparatus for measuring electrolytes including optical measurements
Apparatus for measuring electrolyte concentrations in fluid samples. The apparatus includes an ion selective electrode capable of generating a voltage differential having a magnitude related to the...
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5134361 |
Opitcal system for linearizing non-linear electro-optic
A device for rapidly measuring voltages by electro-optic or magneto-optic ans which exhibits a substantially linear response over much of its operating range. The device employs the Pockels effect...
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5130641 |
Eddy wheel edge sensor
A sensor for detecting the rotation of an eddy wheel in an electric power meter is described. The sensor includes a pair of light sources arranged to focus light on the edge of the wheel, and a...
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5128608 |
Optical instrument transformer
An optical instrument transformer can measure both current and voltage of the primary conductor. Measurement of current is made through modulation effect of a light signal by the optical...
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5126661 |
Optical probing method and apparatus
An integrated circuit (11) is tested at a high microwave frequency through the use of a laser beam (19) having a repetition rate much lower than the test frequency. Electric fields of the test...
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5124634 |
Ring optical current transducer
An optical current transducer for measuring current in a high voltage transmission line includes a temperature compensated light source of nominal predetermined intensity and wavelength, a Faraday...
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5124635 |
Voltage imaging system using electro-optics
A two-dimensional image of the voltage distribution across a surface at a large plurality voltage test points of a panel under test is extracted by illuminating the surface with an input beam of...
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5119426 |
Linear array level meter displaying multiple audio characteristics
A linear display device provides a floating bar type of display for instantaneous peak values and instantaneous average values of an audio signal. Pairs of respective peak and average comparators...
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5115127 |
Optical fiber sensor for measuring physical properties of fluids
A physical property of a fluid or of any optical fiber is measured using an ptical fiber interferometer. A conductive material is disposed upon the surface of a region of a light tranmitting...
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5113131 |
Voltage measuring device having electro-optic sensor and compensator
An apparatus and method for measuring an unknown voltage using electro-optic materials includes a beam transmitter, voltage sensor, and a receiver. The beam transmitter generates an...
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5111135 |
Method for optically measuring electric field and optical voltage/electric-field sensor
A method for optically measuring an AC electric field or an AC voltage is disclosed. According to the method, a light beam emitted from a light-emitting portion is transmitted through a sensing...
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5109189 |
Single crystal electro-optic sensor with three-axis measurement capability
A sensor utilizing a single electro-optic crystal for simultaneously measuring an electric field in three directions. By providing three light beams aligned along specific crystallographic...
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5107202 |
Fiber optic current monitor for high-voltage applications
A current monitor which derives its power from the conductor being measured for bidirectionally measuring the magnitude of current (from DC to above 50 khz) flowing through a conductor across which...
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5103164 |
Optical current transformer
An optical current transformer particularly useful for a fault location system for a power supply system and substation, including a casing which can be detachably secured to a plurality of wire...
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5095265 |
Circuit status indicator having liquid crystal display
An indicator for instantaneously indicating the presence of voltage on a monitored electrical conductor of an AC power distribution system utilizes a high impedance liquid crystal display component...
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5089771 |
Reading device for a watt-hour meter
In a watt-hour meter for metering electricity consumption of the type including: a disc mounted to a rotation shaft and a register mechanism. The watt-hour meter is further provided with a reading...
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5087810 |
Fiber optic magnetic field sensor
Light from source (10) is transmitted along an optical fiber (12) to a free end (20). Light emitted from the optical fiber free end is transmitted to a target (22), such as the free end of a second...
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5067044 |
Sensor for detecting a quench in a superconductor using an optical coupling
A quench detector for a superconducting coil is provided which utilizes an optical coupling and a rotary encoder. The presence of a resistive voltage in the superconducting coil created by a quench...
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5066903 |
Optical current transformer
An optical current transformer, which uses a Faraday cell for detecting the intensity of a magnetic flux induced in a circular iron core, has plural windings having the same number of turns...
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5059894 |
Electro-optic voltage measuring appartaus with single ended optics
A voltage measuring system utilizes an electro-optic voltage transducer (EOVT) in which two beams of polarized light injected into one end of an electro-optic crystal parallel to its fourfold axis...
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5057771 |
Phase-locked timebase for electro-optic sampling
A phase-locked timebase for electrical and electro-optic sampling has an offset phase-locked loop for controlling the delay between a stimulus reference signal and a sample strobe signal. A...
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5057767 |
Optical communications light shield for energy meter
An optical communications shielded link assembly is provided from outside the cover of an electronic power meter to the register assembly without connecting cables and including an optical coupler...
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5057768 |
Measuring device with variable color display
A measuring device includes a variable color display for indicating measured values of an input signal. A comparator and a color control circuit are provided for controlling the color of the...
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5055770 |
Method and apparatus for detecting voltage
A voltage in a selected area of an object is measured by launching an input light beam into an electrooptic material whose refractive index is changed in accordance with an electric field created...
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5055772 |
High voltage ignition system monitor for spark initiated internal combustion engines
A method and device for continuously monitoring the distributed high voltage pulses from an ignition coil of an electrical system of an internal combustion engine is disclosed. The device is a...
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5053617 |
Instrument for concurrently optically measuring thermal and electric quantities
An instrument including a light-emitter for emitting a light beam, a sensing head portion through which the light beam is transmitted, a light-detective element receiving the beam from the head...
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5053694 |
Device for measuring an electric field
A device for measuring an electric field comprises three optical fiber sensors, which each have a piezoelectric sensor element, as well as an interferometer for generating a sensor signal. The...
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5053696 |
Electro-electron oscilloscope
A system for time-resolving ultra-short electrical waveforms of up to a few hundred gigahertz bandwidth is presented. The system utilizes a fast electro-optic modulator capable of subpicosecond...
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5053693 |
Fibreoptical sensor
In an interferometric fiberoptic sensor with homodyne detection for measuring electrical fields or voltages, the measurement signal is compensated separately from operating point control. The...
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5051577 |
Faraday effect current sensor having two polarizing fibers at an acute angle
In known Faraday effect current sensors, light is fed into a polarizer, through a coil of field-sensitive optical fiber, and into a polarization measuring device. Such a current sensor can provide...
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5041779 |
Nonintrusive electro-optic field sensor
Utilizing the property of electro-optic crystal which changes its index of refraction in the presence of electric field, such a crystal is placed inside the resonant cavity of a Fabry-Perot type...
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5041783 |
Probe unit for an atomic probe microscope
A probe unit includes a disk-like substrate made of transparent material, a transparent electrode coated on all over the substrate, and a metal wire whose sharp tip is projected vertically and...
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5038103 |
Optical fiber magnetometer
An optical fiber magnetometer having omnidirectional capability is disclo herein for measuring a total magnetic field independent of its physical orientation or the direction of the field or...
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5038029 |
Optical sensor arrangement including polarization-altering sensor
The invention relates to an optical sensor arrangement having a light emitting arrangement (2), which feeds a first emission light beam into a first emission optical waveguide (3) and a second...
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5036270 |
Apparatus for detecting electrostatic surface potential
A set of birefringent members disposed in a path of light has an input surface via which the light enters the set and an output surface via which the light exits from the set. The birefringent...
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5034682 |
Method and apparatus for mounting disk sensing optics on electric energy register circuit board
A disk sensing optics assembly is mounted directly on the register circuit board of an electronic energy meter. The molded optics assembly includes an central cavity adapted to receive a...
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5034679 |
Polarization feedback control of polarization rotating sensor
A measuring system (40) for measuring a magnitude of a quantity in accordance with the invention includes a light source (52) for providing a light beam (58); a polarization controller (44),...
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5029273 |
Integrated optics Pockels cell voltage sensor
An integrated optics Pockels cell for use in a voltage sensor includes a crystal exhibiting the electro-optic effect in which an integratd straight line wave guide substantially aligned with a z...
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5028865 |
Device having main and secondary optical sensors
The device of the invention comprises a main optical sensor (3) suitable for measuring a changing physical parameter, and a secondary optical sensor (6) suitable for measuring a disturbance which...
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5027056 |
Multifunction register enclosure for energy meter
An electronic time of use or demand register is provided for selective addition to a watthour meter in an energy meter. The electronic register is configured for parallel mounting beside the...
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5025209 |
Apparatus for detecting surface potential distribution
An apparatus for detecting a distribution of a surface potential on a measured object comprises a reading head opposing the measured object. The reading head includes an optical modulator subjected...
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5021647 |
Optical fiber sensor having function of compensating for all drifting components
An optical fiber sensor, which has a detector section connected in a single optical path made of an optical-fiber cable and having a light-modulating element and an optical element connected in...
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5021731 |
Thermo-optical current sensor and thermo-optical current sensing systems
A thermo-optical current sensor includes a resistive or semiconducting sensing element that has an optical property that varies as a function of temperature. Current to be measured flows through...
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5015944 |
Current indicating device
A unitary, self-contained device for sensing and signalling the flow of current through a conductor includes a toroidal coil of electrically conductive wire having two ends, and an illuminating...
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5015943 |
High power, high sensitivity microwave calorimeter
A microwave calorimeter is disclosed for substantially measuring the total icrowave energy in an applied microwave pulse. The microwave calorimeter includes: a housing having a highly reflective...
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5012183 |
Electrooptic effect element and electrical signal waveform measuring apparatus using the same
An electrooptic effect element of this invention has first, second, and third electrodes. The first and second electrodes are formed on a substrate having an electrooptic effect, in order to form a...
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5012182 |
Electrical measuring device
The disclosed porcelain insulator has built-in optical transmission media extending therethrough from a base metal secured at one end thereof to a conductor-holding fixture at the opposite end...
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5010335 |
Optical port multiplexer for electric metering equipment
A single optical port in an electric meter is multiplexed between at least two internal systems by using a multiplexer circuit which has a set of data lines which can be connected to the optical...
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5008611 |
Method of eliminating the effects of birefringence from the detection of electric current using Faraday rotation
An improved method and apparatus for measuring a target electric current utilizing a Faraday effect in which an optical medium is magnetically coupled with the target electric current and light is...
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