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7589515 |
Method for reducing temperature-dependent error in photocurrent sensor, and photocurrent sensor device
[Problem] To permit reduction in the temperature dependence of a sensor, which is ascribable to the temperature dependence of the Verdet constant of a sensor fiber, at a low cost. [Means for...
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7548053 |
Wide-band antenna coupled spectrometer using CMOS transistor
To create a broad band spectrometer, a plurality of individual antenna based bolometers are fabricated on the surface of a single spectrometer chip, each bolometer having an individual antenna...
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7518376 |
Electric field probe
This is an electronic scanning probe, preferably made up of at least two sensing elements, each sensing element substantially surrounded by reference electrodes. These sensing elements are...
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7466118 |
Compensation of simple fibre optic Faraday effect sensors
An electric current measurement device includes a housing defining first and second open ends sealed by first and second sealing means, respectively; a first optical fibre received in an aperture...
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7460741 |
Fiber optic current sensor and method for sensing current using the same
An apparatus for sensing current and a method for sensing current are provided. The apparatus includes an optical fiber having first and second opposing ends and a hollow passageway therethrough, a...
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7443170 |
Device and method for determining at least one variable associated with the electromagnetic radiation of an object being tested
A device determines at least one characteristic of electromagnetic radiation emitted from a test object. A support receives the object. A network of probes is distributed along a substantially...
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7425820 |
High current measurement with temperature compensation
A non-contact device for measuring current in a conductor. The device includes an interferometer with an optical fiber that extends around the conductor and through which light beams pass. The...
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7421212 |
Detecting and locating pulses using a Bragg cell
Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated...
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7372249 |
Load measurement for a thermal microwave power sensor
A thermocouple power sensor includes the ability to monitor the value of a RF load resistor. A meter connects to the input of a thermocouple-based RF signal power detector. The apparatus can sense...
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7339363 |
Variable gain received signal strength indicator
An RSSI circuit provides a relatively inexpensive technique for accurately measuring received signal strength over a wide dynamic range. A received signal is processed by a rectifier circuit that...
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7336062 |
Optically measuring electric field intensities
An apparatus includes an optical resonator and a passive optical device. The optical resonator has first and second optical reflectors and an optical cavity interposed between the reflectors. The...
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7298134 |
Electrical-energy meter adaptable for optical communication with various external devices
An example embodiment of an electrical-energy meter comprises a transformer for producing an electrical output proportional to an electrical current in a conductor of electrical energy, a circuit...
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7298128 |
Method of detecting RF powder delivered to a load and complex impedance of the load
Methods and systems of detecting one or more characteristics of a load are disclosed. One or more characteristics of a first signal may be detected at the output of a Radio Frequency (RF) power...
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7242176 |
Systems and methods for evaluating electromagnetic interference
Systems and methods for evaluating electromagnetic interference that may be employed, for among other things, to evaluate electronic system immunity to radiated electromagnetic fields and/or to...
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7235962 |
Inductor-based current sensing
A circuit for sensing a current in an inductor is described. Integrator circuitry is operable to generate a first signal representing an integration of a voltage across the inductor. Comparison...
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7176671 |
Current measuring device
A current measuring apparatus comprises a current detection unit 10 and a photoelectric converter 20 . The current detection unit 10 comprises an optical fiber sensor 11 extended or looped...
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7119339 |
Transmission mode terahertz computed tomography
A method of obtaining a series of images of a three-dimensional object by transmitting pulsed terahertz (THz) radiation through the entire object from a plurality of angles, optically detecting...
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7109739 |
Wafer-level opto-electronic testing apparatus and method
A wafer-level testing arrangement for opto-electronic devices formed in a silicon-on-insulator (SOI) wafer structure utilizes a single opto-electronic testing element to perform both optical and...
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7084616 |
Method and device for measuring an electrical voltage
A method and device for measuring electrical voltage allow measurement under open-air conditions including high-voltage and very high voltage. Influence of temperature changes on electrical and...
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7082230 |
Optically modulated scatterer and array thereof
The present optically modulated scatterer comprises a substrate, an antenna positioned on the substrate, an optical switch connected to the antenna, and an optical waveguide connected to the...
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7075286 |
Fiber-optic current sensor
An optical current sensor having a reflection interferometer ( 1, 10 ) has, in its fiber-optic lead ( 2 ), a polarization-maintaining first fiber branch ( 20 ) for two forward-traveling...
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7057792 |
Optical sensor unit for measuring current and voltage of high frequency
An optical sensor unit, free from electrical noise, includes a sensor case which has both lateral sides having high frequency connectors mounted thereon, and a metallic plate mounted inside the...
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7039454 |
Biological optical measuring instrument
A biological optical measuring instrument comprising a measuring probe ( 101 ) for collecting light from a plurality of portions of a subject ( 214 ) transmitted through the subject ( 214 ) by...
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7019511 |
Optical analysis of integrated circuits
The invention is directed to a system and method for analyzing an integrated circuit having silicon on insulator (SOI) structure. According to one example embodiment of the present invention, an...
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7009378 |
Time division multiplexed optical measuring system
A time division multiplexed optical voltage measuring system includes an optical voltage sensing system module including, (i) a plurality of optical sensors where each sensor is responsive to an...
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6995550 |
Method and apparatus for determining properties of an electrophoretic display
A method for sensing the state of an electrophoretic display includes the steps of applying an electrical signal to a display element, measuring an electrical response for the display element, and...
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6989664 |
RF power sensor for measuring an RF signal power using capacitance
An RF power sensor for measuring power for an RF signal using capacitance includes a substrate preferably formed of a semiconductor, such as silicon or of a dielectric substance, a fixture part...
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6980911 |
Automatic transfer switch system with synchronization control
An automatic transfer switch (ATS) system and method of operating an ATS system to switch between first and second powers received from respective first and second power supplies, are disclosed. In...
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6952107 |
Optical electric field or voltage sensing system
An electric field sensing system is characterized so that a signal processor may derive an output representative of an electric field intended to be measured, particularly established by high...
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6936978 |
Methods and apparatus for remotely controlled illumination of liquids
Methods and apparatus for remotely controlled illumination of liquids in a variety of environments. In one example, remotely controlled multi-color LED-based light sources are employed to achieve a...
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6930475 |
Method for the temperature-compensated, electro-optical measurement of an electrical voltage and device for carrying out the method
For measuring an electric voltage in an electro-optic voltage converter, polarized light of two wavelengths is sent through a medium. At the output side, the light is led through a polarizer and...
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6919716 |
Precision avalanche photodiode current monitor
Precision measurement of optical signal power is provided. In one implementation, a Wilson current mirror senses current through an avalanche photodiode (APD) that has been exposed to the optical...
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6909977 |
Method for diagnosing degradation in aircraft wiring
Wiring in new and older aircraft use bundled insulated conductors that are subject to deterioration overtime that can result in on-board fires, loss of in-flight control and eventual crashes of the...
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6906506 |
Method and apparatus for simultaneous measurement of electric field and temperature using an electrooptic semiconductor probe
An apparatus and method to simultaneously measure electric and thermal fields with a single probe. Using an electrooptic semiconductor probe, the Pockels effect is employed to measure electric...
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6894514 |
Circuit pattern detecting apparatus and circuit pattern inspecting method
A transparent conductive layer is formed under a glass substrate. A reflection preventing layer and a reflecting layer are formed on the respective surfaces of an electro-optic crystal layer. The...
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6885182 |
Temperature-compensated electro-optical voltage sensor
The electra-optical voltage sensor has an electra-optically active medium and a distance medium between two electrodes, between which the voltage V to be measured is present. The media and the...
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6876188 |
Electro-optical voltage sensor for high voltages
The voltage sensor for measurement of a voltage V, which is present between two electrodes ( 3, 4 ) and generates an electric field E, comprises at least two layers ( 1 a, 2 a ) made of...
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6854327 |
Apparatus and method for monitoring compaction
An apparatus and method for continuous, passive detection and measurement of tensile and compressional strain in a structure utilizing a shielded optic fiber, the optic fiber having one or more...
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6806650 |
Structure and the method for measuring the spectral content of an electric field as a function of position inside a plasma
An RF electric field probe device for measuring an RF electric field intensity in a plasma. The device is composed essentially of an electric field sensing unit and an output unit. The electric...
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6774616 |
System for detecting fluids in a microfluidic component
A system for detecting fluids in a microfluidic component having at least one microchannel including a limitation wall which has two surfaces which, facing the microchannel in a transparent area,...
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6768226 |
Electric circuit shielding
A measuring circuit capable of performing a high-accuracy measurement by eliminating inductive influence from an ambient noise voltage source. An electric circuit including a signal circuit of high...
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6767129 |
Microwave power sensor and method for manufacturing the same
A microwave power sensor and a method for manufacturing the same. The microwave power sensor includes a semiconductor substrate with a nitride or oxide film formed thereon. A membrane which is a...
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6737853 |
Photoconductive-sampling voltage measurement
A method of probing voltage comprises: establishing electrical connectivity between a conductor to be probed and a first terminal of a photoconductive switch; during a sampling interval n, applying...
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6734657 |
Temperature-compensated fiber optic current sensor
In a fiber optic current sensor having a coiled sensor fiber ( 1 ) which encloses a current conductor (S), and at least one phase delay element ( 4, 5 ) adjoining the sensor fiber ( 1 ), the at...
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6724179 |
Opto-electric device for measuring the root-mean-square value of an alternating current voltage
An opto-electric device for measuring the root mean square value of an alternating current voltage has: a) an electric field-to-light-to-voltage converter having 1) a light source; 2) an...
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6703821 |
Faraday-effect current sensor with improved vibration response
The invention is directed to a Faraday-type current sensor which is less susceptive to effects caused by rotation, acceleration and vibration of the sensor coil. The sensor coil of the invention...
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6693536 |
Electromagnetic radiation monitor
A site or vehicle which includes a plurality of electromagnetic radiators monitors the radiation by the use of a plurality of broadband sensors spaced about the potential radiation site or vehicle....
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6686997 |
Apparatus and a method for pulse detection and characterization
An optical/analog/digital pulse detector receives an input signal and drives a Bragg cell illuminated by a collimated light beam. The Bragg cell spatially modulates the collimated light beam and...
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6683447 |
Electro-optic apparatus for measuring signal potentials
An electro-optic sampling apparatus is provided to enable measurement on potentials of signals on the conductor of coaxial cable with high precision and with ease. Herein, an electric input...
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6677769 |
Scanning electromagnetic-field imager with optical-fiber-based electro-optic field-mapping system
A microwave and millimeter-wave electric-field mapping system based on electro-optic sampling has been developed using micromachined Gallium Arsenide crystals mounted on gradient index lenses and...
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