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7196320 |
Fiber optic encoder for position sensing
A passive all fiber optic encoder that will be able to determine speed, position, and direction of movement of a movable object. The all passive encoder utilizes no electronics within the sensing...
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7170606 |
Multi-way LED-based surface reflectance sensor and spectrophotometer
A light sensor circuit based on direct connection of LEDs to I/O pins of a microcontroller. The LEDs are reverse biased and the parasitic junction capacitance is charged in an output mode. Then,...
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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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7036379 |
Fluid diffusion resistant glass-encased optical sensor
A fluid diffusion resistant tube-encased fiber grating pressure sensor includes an optical fiber 10 having a Bragg grating 12 impressed therein which is encased within a sensing element, such...
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7015458 |
High density fiber optic output interface and system
A fiber optic control system for controlling remotely located devices. The control system includes an illumination source for producing a light beam and a plurality of optical fibers. Each fiber is...
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6984819 |
Optical converting type ultrasonic receiving apparatus
An ultrasonic receiving apparatus is equipped with such a condition capable of obtaining superior sensitivities. This ultrasonic receiving apparatus includes: an ultrasonic detecting element for...
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6954580 |
Optical receiver with high dynamic range
An optical coupling assembly having an optical receiver that exhibits extended dynamic range, and, more particularly, an optical receiver that is integrated with a Variable Optical Attenuator (VOA)...
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6921894 |
Fiber optic micro accelerometer
An accelerometer includes a wafer, a proof mass integrated into the wafer, at least one spring member connected to the proof mass, and an optical fiber. A Fabry-Perot cavity is formed by a...
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6899849 |
Integrated sensor
An integrated optical chip device for molecular diagnostics comprising a tunable laser cavity sensor chip using heterodyned detection at the juncture of a sensor laser and a reference laser, and...
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6766072 |
Optical threshold and comparison devices and methods
An optical device for providing threshold and comparison functions. The device comprises first and second SOA's having respective first and second propagation paths along which the first and second...
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6750967 |
Light scattering measuring probe
The constitution of a probe for measuring light scattering according to this invention is as follows: a light input optical fiber 4 and a scattered light measuring optical fiber 6 for...
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6748128 |
Device for changing the length of the running path of an electromagnetic wave
The device serves for changing the length of a running path of an electromagnetic wave. It comprises a wave guide which is wound onto a core. The core is formed in two parts, wherein the distance...
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6744036 |
Optically coupled sensor for application to combustible liquids
An optically coupled circuit is electrically coupleable to a capacitive probe transducer disposed in a liquid in a tank for sensing the capacitance of the probe transducer which is a measure of a...
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6738173 |
Limiting amplifier modulator driver
Apparatus for driving an optical system modulator to modulate data signals onto a light wave of the optical system. The modulator driver apparatus has a limited amplifier for receiving multiplexed...
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6730920 |
Abbe arm calibration system for use in lithographic apparatus
In a lithographic apparatus, a reference grating 11 mounted on the wafer table WT is illuminated with a measurement beam 20 incident in a direction independent of wafer table tilt. The...
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6724786 |
Variable optical attenuator using wavelength locked loop tuning
A system and method for automatically attenuating optical signals transmitted in optical systems. The system and method exploits a wavelength-locked loop servo-control circuit and methodology that...
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6680472 |
Device for measuring of optical wavelengths
Fibre optic apparatus for accurate and repeatable measurements of light comprising one or more wavelength ranges, and system employing the apparatus. The apparatus according to the invention...
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6559999 |
System for modulating radiation using two rotating discs
The present invention is directed to a system for modulating thermal infrared radiation for a pyroelectric imaging sensor or similar sensor by providing two discs rotating at the same speed, both...
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6556149 |
Switches and joysticks using a non-electrical deformable pressure sensor
Switches and joysticks comprise user-moveable two position and multi position switches, including simple on/off and variable switches such as dimmers. The switches operate on the principle of...
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6545259 |
Optical wavelength monitor for a passive optical component
An optical wavelength monitor provided with an optical coupler for coupling at least a part of the optical signals transmitted in an optical waveguide, which signals are transmitted by means of...
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6411909 |
Device for measuring the fluid consumption of a user over a given time
The invention relates to a device for measuring the fluid consumption of a user over a given measurement time, including a volumetric meter ( 26 ) connected to a central information processing unit...
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6376831 |
Neural network system for estimating conditions on submerged surfaces of seawater vessels
An algorithm method of predicting estimated sea energy, wave directions and other seastate data with respect to submerged sea-going vessels, based on inputs derived from signal processed...
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6307666 |
Voltage sensing systems and methods for passive compensation of temperature related intrinsic phase shift
A small sized electro-optic voltage sensor capable of accurate measurement of high levels of voltages without contact with a conductor or voltage source is provided. When placed in the presence of...
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6262415 |
Orientation sensor system with high precision optical interrogation and dense multiplexing
An apparatus and method for measuring the orientation of a platform by receiving and reading signals from one or more orientation sensors, such as a magnetic compass, using optical interrogation,...
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6246048 |
Methods and apparatus for mechanically enhancing the sensitivity of longitudinally loaded fiber optic sensors
An optical fiber is provided with a Bragg grating formed along a portion of its core and a mechanical structure arranged adjacent to the Bragg grating for amplifying longitudinal strain on the...
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6243006 |
Safety device for motor-operated systems
A safety device for externally driven systems for protecting the movement of a system component against undesired collision with an object lying in the movement path of the system component is...
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6066844 |
Optical receiver with integrated variable attenuator
An optical assembly for detecting an optical signal from a signal source in systems where the intensity of the optical signal may surpass the operational range of the optical detector being used....
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5933001 |
Method for using a wideband, high linear dynamic range sensor
A magnetic field sensor which can be used as an active antenna is disclosed that is capable of small size, ultrawideband operation, and high efficiency. The sensor includes a multiplicity of...
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5780847 |
Verdet constant temperature-compensated current sensor
A fiber optic, Faraday-effect current sensor (optical current transducer) which has improved temperature sensitivity due to compensation for temperature-induced variations of the Verdet constant....
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5780846 |
Device in pen form with means for measuring a length
A measuring or determining device including a measuring head with a movable body designed to be placed in contact with the object on which the measurement or determination is to be executed. The...
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5747348 |
Diode laser interrogated fiber optic hydrazine-fuel sensor
A fiber optic chemical dosimeter system detects the presence of hydrazine fuels and nitrogen tetroxide and nitrogen dioxide gases that are used at rocket launch sites using colorimetric sensors...
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5719497 |
Lensless Magneto-optic speed sensor
Lensless magneto-optic speed sensor. The construction of a viable Faraday sensor has been achieved. Multimode fiber bundles are used to collect the light. If coupled directly into a 100 or 200 μm...
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5699461 |
Optical fiber sensors and method for making the same
An optical fiber sensor which comprises a substrate having a groove pattern, an optical fiber which includes a shaped, bare optical fiber portion of an inverted U form and capable of being received...
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5693935 |
Method and device for continuous pattern sensing using fiber optics
A fiber optic signal collection system and method for position sensing or sensing other parameters indicated by light distinctive patterns. The system is particularly suitable for use in aircraft...
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5684298 |
Photonic-based sensing apparatus using displacement tracking of an optical beam in a semiconductor
The invention employs a high-resolution semiconductor optical beam position sensor mechanically coupled to an optical beam source by a mechanical linkage which is either elastically deformable (in...
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5650612 |
Optical sensor using swept wavelength light source
An optical sensor system uses a light source which outputs light at a plurality of wavelengths which vary with time in a manner such that only one wavelength is output at any one point in time; and...
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5626804 |
Roller position controller for a continuous belt press
The present invention provides a roller position controller for a continuous belt press whereby the positions of the rollers supporting the belts are monitored and controlled, so that their...
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5619046 |
Method of manufacturing a measuring device
The invention concerns a method of manufacturing a measuring device of the Fabry-P erot resonator type. The invention likewise concerns a measuring device manufactured by means of the method. The...
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5602946 |
Fiber optic sensor system for detecting movement or position of a rotating wheel bearing
An improved fiber optic sensor system and integrated sensor bearing assembly for detecting movement or position of a rotating wheel bearing having a multi-pole tone ring which produces an...
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5602339 |
Injection molding machine pressure transducer with trapezoidal cavity
An in-line pressure transducer includes a body and an inner ring, coupled to the body, through which molten material flows. The inner ring expands in response to pressure from the molten material....
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5567622 |
Sensor for detection of nitrogen dioxide and nitrogen tetroxide
A fiber optic chemical dosimeter system detects the presence of hydrazine fuels and nitrogen tetroxide and nitrogen dioxide gases that are used at rocket launch sites using colorimetric sensors...
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5557265 |
Method and system for indicating an optical transmit amplifier fault
Optical transmit amplifier (24) fault indicator system (46), (78), and (80) indicates the failure of optical transmit amplifier (24) and includes an input loss circuit (46), an output failure...
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5539201 |
Multiple channel driver for fiber optic coupled sensors and switches
A multiple channel driver for fiber optic devices includes a source and an associated detector for each channel having processing circuitry and the power for the sources common to all channels. The...
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5535293 |
High-speed electro-optical modulator, chopper, and multiplexer/demultiplexer
A high-speed optical switch having a first light port, a second light port, a focussing system, a mirror, and a motor. The focussing system focuses light from the first light port at a focal point...
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5521749 |
Optical modulation apparatus
In accordance with a mean value of a modulated light supplied from an optical modulator utilizing electro-optic effect, the drift amount of voltage light output characteristics (an operative point...
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5496997 |
Sensor incorporating an optical fiber and a solid porous inorganic microsphere
The invention is a sensor which includes a porous microsphere and an optical fiber which having a proximal end and a distal end. The distal end of the optical fiber is coupled to the porous...
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5491334 |
Magneto-optical input system for infrared detectors
A detector interface system communicates signals between an infrared detector element maintained in a cryogenic environment and associated signal processing circuitry maintained in a non-cryogenic...
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5473156 |
Optical displacement sensor using dual reference reflectors
An optical displacement sensor comprises first and second optical fibers which transmit light to and receive light reflected from first and second fixed reflectors. A third optical fiber transmits...
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5471052 |
Color sensor system using a secondary light receiver
A system for photoelectrically sensing the color of an object includes two or more light sources having different characteristic ranges of chromaticity and one primary photosensitive element which...
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5457313 |
Fiber optic detector and method for using same for detecting chemical species
An optical sensing device for uranyl and other substances, a method for making an optical sensing device and a method for chemically binding uranyl and other indicators to glass, quartz, cellulose...
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