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7997121 |
Milliwave melter monitoring system
A milliwave melter monitoring system is presented that has a waveguide with a portion capable of contacting a molten material in a melter for use in measuring one or more properties of the molten...
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7808620 |
Microchip testing device
A testing device equipped with: a microchip having a receiver for a test fluid, a discharge lamp which emits light into the microchip test fluid receiver, a light source housing in which the...
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7573565 |
Methods and systems for determining the density and/or temperature of fluids
Methods and systems are provided for determining the density and/or temperature of a fluid based on a reflection of optical energy directed at the fluid.
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7435010 |
High temperature light guide
Disclosed is a method of forming an optical monitoring or transmitting light guide and a resulting apparatus that begins by bonding a bundle of optical fibers together using an epoxy and polishing...
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7091254 |
Analytical instruments for monitoring photopolymerization
An apparatus for continuously monitoring a photopolymerization reaction in real time by optical pyrometry includes a housing having a chamber; a sample mount that may be disposed within the...
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7008103 |
Method and apparatus for temperature sensing utilizing optical fiber
A method and apparatus for sensing temperature using optical fiber is provided. In one embodiment, a method for sensing temperature using optical fiber includes launching a polarized optical signal...
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6843202 |
Thermal processing apparatus for substrate employing photoirradiation
A lamp house storing a plurality of flash lamps and a chamber storing and holding a semiconductor wafer are fitted to each other in an openable/closable manner. The lamp house and the chamber are...
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6826954 |
Method and apparatus for flow measurement
A method and apparatus is disclosed for measuring the flow of fluid in the conduit, giving the example of oil in a well bore (12). A heat exchanger such as a cooling station (66) is placed in the...
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6811307 |
DTS measurement of HV cable temperature profile
A fiber optic cable is used as a distributed temperature sensing (DTS) transducer for temperature profile measurements in a protective underground duct in which a high voltage (HV) cable has...
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6002501 |
Method and apparatus for active tamper indicating device using optical time-domain reflectometry
An optical time-domain reflectometer (OTDR) launches pulses of light into a link or a system of multiplexed links and records the waveform of pulses reflected by the seals in the link(s). If a seal...
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5930415 |
Monitoring device for a gas-insulated cable
A gas-insulated cable includes a plurality of sections separated by sealed partitions, each section including a cylindrical steel case, a cylindrical aluminum screen coaxial with and inside the...
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5828797 |
Fiber optic linked flame sensor
A fiber optic linked flame sensor for continuous optical monitoring of the combustion process within the combustion chamber of a gas turbine engine. The system includes a high temperature optical...
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5825804 |
Temperature distribution measuring apparatus using an optical fiber
A temperature distribution measuring apparatus and related method uses optical time domain reflectometry to determine temperature distribution along an optical fiber. A light pulse enters the fiber...
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5821861 |
Monitoring wall temperatures of reactor vessels
Wall temperatures of a reactor vessel are monitored by arranging an optical fibre in thermal contact with the wall and employing an optical time domain reflectometry system to monitor the...
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5672008 |
Reconfigurable multipoint temperature sensor
A temperature sensor having a light fiber connecting a light source and a reflectometer. Temperature measurement zones are formed by sensing elements made of shape-memory alloy. The elements exert...
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5608515 |
Double window for protecting optical sensors from hazardous environments
An optical sensor system includes a housing having an open end; first and second windows situated in the housing; a fastener for situating the first window closer to the open end than the second...
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5592282 |
Suppression of stimulated scattering in optical time domain reflectometry
Optical time domain reflectometry methods and apparatus are proposed in which the back-scattered optical radiation used to produce output signals is restricted to that resulting from Rayleigh...
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5585914 |
Apparatus and method for measuring a temperature of a high temperature liquid contained in a furnace
An apparatus and method for measuring a temperature of a high temperature liquid contained in a furnace. An optical fiber covered with a metallic tube is inserted through a passageway inside a...
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5568978 |
Optical apparatus and method for measuring temperature of a substrate material with a temperature dependent band gap
An optical method for measuring the temperature of a substrate material with a temperature dependent bandgap. The substrate is illuminated with a broad spectrum lamp and the bandgap is determined...
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5564832 |
Birefringent active fiber laser sensor
A birefringent active fiber laser sensor includes one or more fiber lasers 12, 14, 16, each having a pair of Bragg gratings 18, 20, embedded in a fiber 10 and excited by a common pump light 30. At...
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5539673 |
Non-invasive infrared temperature sensor, system and method
A high temperature, short time microwave heating system 10 for heat-sensitive liquid material to inactivate or reduce pathogenic agents or organisms, such as viral contaminants. The system 10...
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5521697 |
Protective cover for fiberoptic scanner head
A new and improved inner tip or head is provided for a fiberoptic scanner mechanism of the type monitoring the presence of flame in a boiler furnace. The scanner tip according to the present...
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5500731 |
Optical time domain reflectometer using ring laser light source
The purpose of the present invention is to provide a time domain reflectometer in which the system cost is low and the dynamic range is wide. In accordance with the present invention, an excitation...
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5473428 |
Interferometric temperature sensing system having a coupled laser diode wherein the magnitude is adjusted corresponding to a prior feed-back laser beam
An interferometric temperature sensing system provides a simplified design for accurately processing an interference fringe pattern using self coupling effects of a laser detection element, where a...
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5467185 |
Emissions control for internal combustion engine
Respective SiC (silicon carbide) photodiode sensors are used to measure flame temperature at each cylinder of an internal combustion engine, and information generated by the SiC photodiode sensors...
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5447373 |
Light receiving section for an optical pyrometer
A light receiving section of an optical pyrometer enables accurate temperature measurement of molten metal with minimum cost. The light receiving section of the optical pyrometer comprises a...
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5421652 |
Pyrometer adapter
In accordance with the present invention, a pyrometer adapter is disclosed for providing the optical head of a pyrometer access to a target area in a gas turbine engine, where the pyrometer adapter...
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5381229 |
Sapphire optical fiber interferometer
An optical interferometer comprises a multi-mode sapphire fiber as a high temperature sensor. One end of the sapphire fiber is coupled to a silica fiber and, in turn, to the sapphire fiber. The...
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5332316 |
Fiber optic systems for sensing temperature and other physical variables
The invention is drawn to methods and devices for measuring temperature with a simple probe, a single interrogating light source and a single photodetector in a manner that the same probe can be...
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5322361 |
Method and apparatus for measuring temperature
A method and apparatus for measuring temperature by subjecting, to the temperature to be measured, a light-transmissive body of a material whose dimensions change in response to temperature,...
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5315376 |
Method and apparatus for correcting concentration
A concentration correcting apparatus comprising a correction coefficient calculating means and a correcting means is shown and described. The correction coefficient calculating means calculates a...
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5272334 |
Device for detecting a temperature distribution having a laser source with temperature and wavelength adjusting means
An apparatus for measuring temperature along an optical fiber uses backscattered light and optical time domain reflectometry to obtain a measure of the temperature distribution along the fiber. The...
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5255068 |
Fringe pattern analysis of a birefringent modified spectrum to determine environmental temperature
A sensor for use in an optical temperature detector system having a birefringent element made of a single crystal metal oxide plate. A broad band light spectrum is transmitted through a first...
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5217306 |
Temperature distribution analyzer using optical fiber
A temperature distribution analyzer is disclosed. In the analyzer, a measuring optical fiber is provided so as to extend through a target region in order to analyze the temperature distribution of...
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5208650 |
Thermal dilation fiber optical flow sensor
A thermal dilation type optical flow sensor includes an optical heating sce for heating a flowing fluid and a sensor disposed in a downstream direction from said heating source wherein the sensor...
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5172191 |
Sweeping photoreflectance spectroscopy
A sweeping photoreflectance spectroscopy technique and apparatus is disclosed. This technique and apparatus enable the determination of the band structure of semi conductors and other materials at...
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5125738 |
Apparatus and system for locating a point or a faulty point in a transmission line
A plurality of current detectors are provided in a plurality of prescribed spots of a transmission line for locating a fault caused, e.g. by lightning. A plurality of discriminators are provided in...
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5102232 |
Temperature-measuring method and distributed optical fiber temperature sensor
A temperature-measuring method comprises inputing laser pulses into an optical fiber to be measured and measuring temperature distribution in the fiber from the ratio of the amplitudes and the...
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5092680 |
Device for measuring temperature of object in vacuum environment
A device for the measurement of a temperature in a relatively low range having the lower limit of below 100° C. is proposed. The device is suitably used for measuring a temperature of a substrate ...
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5090018 |
Pulsed laser system for visually detecting faults in optical waveguides
A pulsed laser system for visually detecting faults in optical waveguides. A laser operating at a duty cycle of less than fifty percent (50%) produces visible light pulses at a frequency...
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5022754 |
Determining the wavelength of optical radiation
This invention relates to a method and apparatus, i.e. a "wavelength meter", for determininhg the wavelength of optical radiation, e.g., visible radiation. Radiation is subjected to two or more...
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5000580 |
Apparatus and method for measuring temperatures inside process vessels containing a hostile environment
An improved apparatus and means for measuring temperatures inside enclosures or conduits containing hot gases laden with entrained solids using a pyrometer. The improvement involves an optical...
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4958910 |
Radiation pulse generation
A radiation pulse generating assembly comprises a radiation generator such as a laser for generating pulses of radiation having pulse widths in the order of pico seconds. The pulses from the...
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RE33245 |
Method and apparatus for measuring temperature in the high pressure furnace of a hot isostatic pressing
A method of measuring the temperature in a high pressure furnace of a hot isostatic pressing apparatus, wherein a closed-end pipe having its inside communicated with the inside of the high pressure...
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4859065 |
Temperature measurement
A method of measuring temperature comprises the steps of consecutively launching (1, 2) input pulses of light at two different wavelengths into a temperature sensing element in the form of an...
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4845647 |
Method and apparatus for determining temperature in a blackbody radiation sensing system
A system for measuring temperature within a region to be tested includes a sensor means responsive to the temperature within the region for transmitting light energy along an optically-transmissive...
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4804264 |
Arrangement for time-resolved optical backscatter measurement at optical waveguides
A measuring apparatus for space-resolved temperature measurement by optical backscattering measurement at optical waveguides, wherein an improvement in the signal-to-noise ratio is achieved by...
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4799787 |
Optical fibre radiation pyrometer
An optical pyrometer for a gas-trubine engine has a radiation receiving head located to view the blades of the engine and supply radiation from the blades to one end of a fibre-optic cable. At the...
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4790669 |
Spectroscopic method and apparatus for optically measuring temperature
Apparatus and method for optically measuring temperature by spectroscopically determining the temperature-induced changes in the wavelength spectrum of light interacting with a semiconductor...
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4773766 |
Method of measuring temperatures and portable recorder for storing temperature data
A portable temperature data recorder for temporarily storing plural sets of temperature data representative of temperatures at a single location or at different locations, and automatically...
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