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5006789 |
Electro-optic signal measurement
Electro-optic probes which are adapted to be placed in the fringe field from electrical signals propagating on conductors (which may be conductors of an integrated circuit) and which modulate...
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5003247 |
Measuring device with variable color background
A measuring device includes a display which is comprised of a plurality of adjacent display elements, each including a display area for exhibiting an indication of the measured value, substantially...
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4999571 |
Current and/or voltage detector for a distribution system
A current and voltage detector for a distribution system is provided with a lower section, an upper section and a fastener for combining the lower and upper sections into one body. The lower...
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4999577 |
Method for contactless testing of conducting paths in a substrate using photon-assisted tunneling
For testing the integrity of conducting lines on or in a substrate, the following steps are executed: (I) Selected pads are irradiated by a focused optical beam so that they are positively charged...
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4999570 |
Device for making non-contacting measurements of electric fields which are statical and/or varying in time
A device for measuring electric fields, including electric fields having frequencies extending into the GHz range, including an optically active crystal sensor having an optical property which...
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4998063 |
Fiber optic coupled magneto-optic sensor having a concave reflective focusing surface
A device for monitoring a magnetic field intensity having a given direction, the device including: a light conducting member (11) defining a first optical port (23), a second optical port (24), an...
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4996475 |
Electro-optic voltage detector having a transparent electrode
A voltage detector detects a voltage developing in a selected area of an object such as an integrated circuit by utilizing an electro-optic material equipped in an optical probe. A change in...
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4980632 |
Electrical signal observing device
The electrical signal observing device measures the electrical signal by applying the electrical signal to be measured to an optical amplifier in order to modulate a short pulse light train...
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4978910 |
Electrooptic apparatus for the measurement of ultrashort electrical signals
An electrooptic measuring apparatus having both high voltage sensitivity and femtosecond time resolution includes coplanar transmission lines fabricated on a semi-insulating multiple quantum well...
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4975635 |
Voltage detector using a sampling type high-speed photodetector
A voltage detector for measuring the voltage waveform of an object being measured on the basis of the optical intensity signal corresponding to the voltage of the object, including a light source...
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4973899 |
Current sensor and method utilizing multiple layers of thin film magneto-optic material and signal processing to make the output independent of system losses
A sensor (1) for sensing the magnitude of current flowing in a conductor (12) based upon the Faraday effect. The sensor (10) includes a light source (14) for emitting a beam of light which is...
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4973900 |
Voltage detecting device
A voltage detecting device using an electro-optical material with a refractive index that is changed by a voltage at a part of an object comprising a light source, an electro-optical material for...
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4968881 |
Voltage detector using electro-optic material having anti-reflective coatings
A voltage detector comprises a light modulator which employs an electro-optic material whose refractive index changes according to the voltage developing in an object to be measured. A transparent...
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4967144 |
Electrical signal observing device for converting an electrical signal to be measured into an optical intensity waveform
An electrical signal observing device has an optical signal as a probe for converting the voltage or current waveform to be measured into an optical intensity waveform. This optical intensity...
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4967152 |
Apparatus including a focused UV light source for non-contact measurement and alteration of electrical properties of conductors
An apparatus which is used for non-contact electrical measurement and physical alteration of certain characteristics and properties of electronic conductor devices. The apparatus includes a focused...
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4962990 |
Optical device
An optical device including an optical bench and a plurality of optical elements. The optical bench has first and second supporting sections, separated from each other, each having at least two...
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4962353 |
Voltage detector
A voltage detector with an optical modulator comprising a pulse light source for outputting light pulses, a pulse train generator for generating a light pulse train having a pulse interval with the...
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4959642 |
Instrumentation loop-powered backlit liquid crystal display
A loop-powered, backlit liquid crystal display (LCD) responds to a current instrumentation loop for providing a current representative of the value to be measured and an LCD for displaying the...
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4958124 |
Multi-channel voltage detector
A multi-channel voltage detector for converting multi-channel electrical signals into optical signals and simultaneously detecting multi-channel voltages in parallel mode. Comprising electro-optic...
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4956607 |
Method and apparatus for optically measuring electric current and/or magnetic field
A system for optically measuring the strength of an AC magnetic field, by an apparatus which includes a sensing head having a magnetooptical element, a polarizer and an analyzer, a light source...
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4949038 |
Optical fiber having a helical core for sensing a magnetic field
A sensor for sensing magnetic fields. A single mode optical fiber has a core which is wound into a helical shape. The fiber is formed with a former and a core, and the core is preferably attached...
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4947035 |
Fiber optic transducer using faraday effect
The present invention relates, in general, to optical transducers, and more particularly to optical transducers utilizing the Faraday effect and responsive to changes in a magnetic field produced...
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4947107 |
Magneto-optic current sensor
A sensor (10) for sensing the magnitude of current flowing in a conductor (12) based upon the Faraday effect is disclosed. The invention utilizes a magneto-optic material having one or more layers...
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4942362 |
Apparatus for testing ignition systems
An analyzation apparatus for ignition systems that has a pulse detector circuit that generates and converts an AC signal into a DC signal, filters unwanted signals and allows the user to adjust the...
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4940933 |
Fiber optic arc monitor
Apparatus 50 for the detection and location of arcing within an enclosed electrical device, such as an electric generator 20. Fiber optic cables 53 are strategically mounted within the generator 20...
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4939447 |
Fiber-optic voltage sensor
A fiber-optic voltage sensor comprises at least one fiber-optic, piezoelectric sensor element (2a, 2b, 2c, 2d), which measures a predeterminable directional component of a local electric field. One...
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4933634 |
Device and method to measure a short radiation pulse or an electric pulse
A device for measuring a single short pulse includes at least one measuring unit (D1, Dn) comprising a conductive line (L) connected to a set of photoconductors (A, B1-Bp), the line and...
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4933629 |
Method and apparatus for optically measuring electric and magnetic quantities having an optical sensing head exhibiting the Pockel's and Faraday effects
A method and an apparatus for measuring the strength of an AC electric field or an equivalent voltage, or the strength of an AC magnetic field or an equivalent current, based on a light beam which...
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4931724 |
Digital level indicating device
A digital level indicating device for use in compact disk players digital audio tape recorders, etc., which includes a converter circuit for converting a digital signal applied thereto to an...
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4929830 |
Fiber-optic electric field sensor with piezoelectric body sensor
A fibre-optic sensor for measuring a particular directional component of an electric field comprises a piezoelectric body (4) and a glass fiber (5a) which is rigidly connected to the piezoelectric...
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4929050 |
Traveling wave fiber optic interferometric sensor and method of polarization poling fiber optic
An optical light conducting fiber that has a D-shaped stress sensitive coating of PVF 2 which covers substantially equal length segments of said fiber, so that each of said segments is separated...
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4928067 |
Non-intrusive fiber optic electromagnetic field probe apparatus and associated methods
A probe tip is employed to measure electromagnetic fields without the use of a metallic conducting wire or cable which would otherwise distort the field being measured. The probe tip includes a...
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4922186 |
Voltage detector
A voltage detector comprises a pulse light source, a delay means, a dispersing prism made of an electro-optic material and a linear image sensor. The electro-optic material senses a voltage...
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4922187 |
Pulse initiator circuit
The invention provides an improved pulse initiator circuit for attaching to utility meters to generate a pulse signal having a predetermined relationship to the rate of power usage measured by the...
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4920310 |
Voltage detector
A voltage detector detects a voltage developing in a selected area of an object such as an integrated circuit by utilizing an electro-optic material equipped in an optical probe. A change in...
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4916387 |
Optical system for a Faraday effect current sensor
A system for monitoring an alternating current including: a current transducer (10) having first and second optical ports (12,14) and a component for causing optical radiation to travel between the...
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4910458 |
Electro-optic sampling system with dedicated electro-optic crystal and removable sample carrier
An electro-optic sampler utilizes a Pockels cell comprising an electro-optic crystal and a separate, removable sample carrier having an electrical transmission line affixed thereto to provide an...
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4908568 |
Mechanical probe for optical measurement of electrical potentials
A mechanical probe for optical measurement of electrical potentials. The probe of the present invention is composed of a cubic, electro-optical crystal fashioned in the form of a tip and of a...
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4906930 |
Magnetometer using a Josephson device and superconducting phototransistor
A SQUID for detecting a weak magnetic field is constructed of a sensor coil which detects a signal magnetic flux, and a superconducting loop which is magnetically coupled with the sensor coil to...
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4906922 |
Voltage mapping device having fast time resolution
A voltage detecting device for detecting voltages in an object under test including an electro-optic material covering a plurality of parts of the object under test; the refractive index of the...
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4904931 |
Electro-optical voltage measuring system incorporating a method and apparatus to derive the measured voltage waveform from two phase shifted electrical signals
The voltage between two objects is measured utilizing an electro-optic crystal exhibiting birefringence in two axes (slow and fast) mutually orthogonal to an optic axis extending between the two...
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4902963 |
Method and arrangement for recording periodic signals with a laser probe
Method and arrangement for recording periodic signals with a laser probe. The application of stroboscopic methods in laser metrology requires the synchronization of the measuring arrangement...
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4899042 |
Integrated optic field sensor consisting of an interferometer formed in substrate
Integrated optic sensors for measuring electric, magnetic and temperature fields. Each sensor comprises an interferometer that includes first and second arms, each arm comprising an optical...
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4896103 |
Current measuring magnetic field sensor having magnetooptic element with its easy axis of magnetization at right angles to the magnetic field generated by the current
The magnetic field sensor is described for sensing the magnetic field, which comprises a light source part, a magnetic field detection part which contains a magnetooptic element consisting of a...
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4896106 |
Watthour meter for wye connected systems
A watthour meter, preferably for a wye connected load, includes a current transformer for sensing the load current, a resistive voltage divider network for sensing the line voltage, and a measuring...
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4894607 |
Surface potential detecting apparatus
A surface potential detecting apparatus includes an electro-optical crystal element (22), wherein an electric field from a surface to be measured is directly or indirectly applied to a measuring...
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4894608 |
Electric current sensor using the faraday effect
An electric current detector has a light source for generating light having substantially linear polarization and a predetermined polarization direction, a material substantially transparent to the...
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4891580 |
Electro-optic measurements of voltage waveforms on electrical conductors
The longitudinal electro-optic effect is used with an external probe to make voltage measurements on electrical conductors.
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4891581 |
Apparatus for sampling, analyzing and displaying an electrical signal
An apparatus for sampling, analyzing and displaying an electrical signal as disclosed having a good signal-to-noise ratio and high resolution. The apparatus includes a light pulse source for...
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4887026 |
Voltage detector for detecting a voltage developing in a selected area of an object
A voltage detector detects a voltage developing in a selected area of an object such as an integrated circuit by utilizing an electro-optic material equipped in an optical probe. A change in...
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