There is provided a system comprising a combination of a peak field booster with elements to increase spectral bandwidth and efficiency for THz generation and detection. The system is configured to achieve a high dynamic range around 3.5 THz while relying on a cost-effective NIR source, allowing the full system to be built at a lower cost and sold at a competitive price.
There is provided a system comprising a combination of a peak field booster with elements to increase spectral bandwidth and efficiency for THz generation and detection and configured to achieve a high dynamic range around 3.5 THz while relying on a cost-effective NIR source allowing the full system to be built at a lower cost and sold at a competitive price.
There is provided a system comprising a combination of a peak field booster with elements to increase spectral bandwidth and efficiency for THz generation and detection. The system is configured to achieve a high dynamic range around 3.5 THz while relying on a cost-effective NIR source, allowing the full system to be built at a lower cost and sold at a competitive price.
4.
BRIGHT SOURCE IN A COMPACT MODULE FOR PURE PHOTONS ENTANGLEMENT
There is provided bright entangled photon sources including the concept of alignment-free, fiber-based, mechanically-rigid and generic host modules. The attributes of inherent stability of a Sagnac interferometer, high down-conversion efficiency of periodically poled nonlinear waveguides, high optical gain of a semiconductor optical amplifier, and immunity of fiber optics are all incorporated into a single compact module. This robust engine allows the realization of highly stable, integrable and bright polarization entangled-photon sources operating at room temperature. The compact design is based on a novel concept that allows a minimum number of in-line optical parts to enhance the long-term stability and efficiency without compromising the entanglement quality. Besides energy entanglement, polarization entanglement is presented and set through the operational conditions while an optional periodically poled nonlinear waveguide can be hosted to achieve the desired spectral bandwidth and generation rate of the entangled photons. The presented invention delivers a zero-maintenance, lightweight, low-power consumption host of compact and fully-integrable bright polarization entangled photon sources.
G02F 2/02 - Changement de fréquence de la lumière, p. ex. par compteurs quantiques
G06N 10/40 - Réalisations ou architectures physiques de processeurs ou de composants quantiques pour la manipulation de qubits, p. ex. couplage ou commande de qubit
There is provided bright entangled photon sources including an alignment-free, fiber-based, mechanically-rugged and generic interferometric module. The inherent phase-stability of a Sagnac interferometer is deployed. High down-conversion efficiency of periodically poled nonlinear-waveguides is combined with the optical gain of semiconductor optical amplifiers and immunity of fiber optics. A single compact interferometric engine combines these attributes, allowing highly stable, integrable and bright polarization entangled-photon sources operating at room temperature. Using a minimum number of in-line optical parts, the compact module is based on a novel method that enhances the long-term stability and efficiency without compromising the entanglement quality. Besides energy entanglement, polarization entanglement is presented and set through the operational conditions. An optional periodically poled nonlinear waveguide can be hosted to achieve the desired spectral bandwidth and photons generation rate. The result is a zero-maintenance, lightweight, low-power consumption engine of compact and fully-integrable bright polarization-entangled photon sources.
G02F 2/02 - Changement de fréquence de la lumière, p. ex. par compteurs quantiques
G06N 10/40 - Réalisations ou architectures physiques de processeurs ou de composants quantiques pour la manipulation de qubits, p. ex. couplage ou commande de qubit
Bright entangled photon sources including an alignment-free, fiber-based, mechanically-rugged and generic interferometric module are disclosed. The inherent phase-stability of a Sagnac interferometer is deployed. High down-conversion efficiency of periodically poled nonlinear-waveguides is combined with the optical gain of semiconductor optical amplifiers and immunity of fiber optics. A single compact interferometric engine combines these attributes, allowing highly stable, integrable and bright polarization entangled-photon sources operating at room temperature. Using a minimum number of in-line optical parts, the compact module is based on a novel method that enhances the long-term stability and efficiency without compromising the entanglement quality. Besides energy entanglement, polarization entanglement is presented and set through the operational conditions. An optional periodically poled nonlinear waveguide can be hosted to achieve the desired spectral bandwidth and photons generation rate. The result is a zero-maintenance, lightweight, low-power consumption engine of compact and fully-integrable bright polarization-entangled photon sources.
An optical setup to detect fluorescence in samples is described, taking advantage of the geometry of sample vials to optimize both the excitation of fluorescence within said sample vials and the detection of fluorescence from the sample as it is emitted. Said optical geometry can be adapted for different sample containers and can be used in a variety of optical setup, both in single sample test systems as well as sample arrays.
Current laboratory procedures for detection of a virus using the specimens collected from upper respiratory systems involve RNA isolation from the specimen, cDNA synthesis via reverse transcription, amplification of the target region via LAMP reaction, and detection. The present invention performs alternative ways of LAMP reactions in which every single key component in the traditional system is reorganized to achieve operational LAMP protocols. The present invention skips the RNA isolation and purification steps which decrease the overall cost, and the test time by more than 20 minutes. This method can also be applicable for analysis of other viruses and some pathogens in several fields.
C12Q 1/70 - Procédés de mesure ou de test faisant intervenir des enzymes, des acides nucléiques ou des micro-organismesCompositions à cet effetProcédés pour préparer ces compositions faisant intervenir des virus ou des bactériophages
Current laboratory procedures for detection of a virus using the specimens collected from upper respiratory systems involve RNA isolation from the specimen, cDNA synthesis via reverse transcription, amplification of the target region via LAMP reaction, and detection. The present invention performs alternative ways of LAMP reactions in which every single key component in the traditional system is reorganized to achieve operational LAMP protocols. The present invention skips the RNA isolation and purification steps which decrease the overall cost, and the test time by more than 20 minutes. This method can also be applicable for analysis of other viruses and some pathogens in several fields.
C12Q 1/6806 - Préparation d’acides nucléiques pour analyse, p. ex. pour test de réaction en chaîne par polymérase [PCR]
C12Q 1/6865 - Amplification à base de promoteurs, p. ex. amplification de séquence d’acide nucléique [NASBA], système de réplication de séquence auto-entretenue [3SR] ou d’amplification à base de transcription [TAS]
C12Q 1/70 - Procédés de mesure ou de test faisant intervenir des enzymes, des acides nucléiques ou des micro-organismesCompositions à cet effetProcédés pour préparer ces compositions faisant intervenir des virus ou des bactériophages
10.
Method and device for polarization entangled photon pair creation
This disclosure is directed at a method and device capable of producing polarization entangled photon pairs and accomplishing polarization insensitive wavelength conversion. The device includes a double displacement interferometer, the interferometer of which contains an input beam displacing section including a plurality of orthogonally oriented optical beam displacing elements; a wavelength conversion section including a plurality of orthogonally oriented non-linear optical wavelength converters; an output beam recombination section including a plurality of orthogonally oriented optical beam displacing elements.
There is provided a design of a device consisting of a patterned semiconductor material to provide enhanced detection bandwidth and efficiency of terahertz (THz) pulses with an electro-optic sampling. One device has a semiconductor crystal having a patterned grating on a surface of the semiconductor. In a system, there could optionally be a quarter-wave plate after the semiconductor crystal, followed by a prism. A pair of balanced photodiodes can optionally be provided after the prism. A pulse laser having a NIR beam and THz beam is sent through the semiconductor crystal to the quarter-wave plate to the prism to the photodiodes, wherein the patterned grating on the semiconductor crystal diffracts the NIR beam while the THz remains unaffected. The photodiodes can detect the result.
G01N 21/35 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge
G01N 21/359 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge en utilisant la lumière de l'infrarouge proche
G01N 21/3581 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge en utilisant la lumière de l'infrarouge lointainCouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge en utilisant un rayonnement térahertz
There is provided a design of a device consisting of a patterned semiconductor material to provide enhanced detection bandwidth and efficiency of terahertz (THz) pulses with an electro-optic sampling. One device has a semiconductor crystal having a patterned grating on a surface of the semiconductor. In a system, there could optionally be a quarter-wave plate after the semiconductor crystal, followed by a prism. A pair of balanced photodiodes can optionally be provided after the prism. A pulse laser having a NIR beam and THz beam is sent through the semiconductor crystal to the quarter-wave plate to the prism to the photodiodes, wherein the patterned grating on the semiconductor crystal diffracts the NIR beam while the THz remains unaffected. The photodiodes can detect the result.
5 measurements at every 2 minutes (1 minute charging and 1 minute discharging), indicating semi-continuous quantification of organic carbon in water and wastewater.
H01M 8/16 - Éléments à combustible biochimique, c.-à-d. éléments dans lesquels des micro-organismes agissent comme catalyseurs
H01M 8/24 - Groupement d'éléments à combustible, p. ex. empilement d'éléments à combustible
G01N 27/22 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant l'impédance en recherchant la capacité
There is provided a fiber-based broadband polarization-entangled photon source. The polarization entangled photon pair source module comprises an optical fiber, a pump to couple light into the fiber and one or more suppression filters following the fiber. The optical fiber preferably is a periodically poled silica fiber and the pump is preferably a laser diode pump. The present invention relates to a compensation-free, alignment-free, diode-pumped, broadband, polarization-entangled photon source that is based on a low-birefringence fiber. It has an extremely simple configuration capitalizing on the compensation-free and direct generation capability of a low-birefringence fiber. The source has broad bandwidth, high-quality and polarization-entanglement. The present invention is compact, robust, low-power, low-cost, alignment-free and room-temperature operable, featuring a simple turn-key, plug-and-play operation.
A biofilm capacitance microbial electrochemical cell (MEC) was invented to measure organic carbon in water and wastewater (represented by the 5-day biochemical oxygen demand (BOD5) here) rapidly and accurately. The MEC were run at charging (open circuit) and discharging (close circuit) conditions alternately to improve the sensitivity, response time and accuracy. The detectable BOD5 concentrations with the biofilm-capacitance MEC ranged from 5 to 250 mg/L (R2 > 0.9). This innovative MEC sensor enabled BOD5 measurements at every 2 min (1min charging and 1 min discharging), indicating semi-continuous quantification of organic carbon in water and wastewater.
G01N 27/42 - Mesure du dépôt ou de la libération de matériaux d'un électrolyteCoulométrie, c.-à-d. mesure de l'équivalent de Coulomb du matériau dans un électrolyte
There is provided a fiber-based broadband polarization-entangled photon source. The polarization entangled photon pair source module comprises an optical fiber, a pump to couple light into the fiber and one or more suppression filters following the fiber. The optical fiber preferably is a periodically poled silica fiber and the pump is preferably a laser diode pump. The present invention relates to a compensation-free, alignment-free, diode-pumped, broadband, polarization-entangled photon source that is based on a low-birefringence fiber. It has an extremely simple configuration capitalizing on the compensation-free and direct generation capability of a low-birefringence fiber. The source has broad bandwidth, high-quality and polarization-entanglement. The present invention is compact, robust, low-power, low-cost, alignment-free and room-temperature operable, featuring a simple turn-key, plug-and-play operation.
This disclosure is directed at a method and device capable of producing polarization entangled photon pairs and accomplishing polarization insensitive wavelength conversion. The device includes a double displacement interferometer, the interferometer of which contains an input beam displacing section including a plurality of orthogonally oriented optical beam displacing elements; a wavelength conversion section including a plurality of orthogonally oriented non-linear optical wavelength converters; an output beam recombination section including a plurality of orthogonally oriented optical beam displacing elements.
G02F 2/02 - Changement de fréquence de la lumière, p. ex. par compteurs quantiques
H04B 10/00 - Systèmes de transmission utilisant des ondes électromagnétiques autres que les ondes hertziennes, p. ex. les infrarouges, la lumière visible ou ultraviolette, ou utilisant des radiations corpusculaires, p. ex. les communications quantiques
18.
GLASS FERRULE COUPLING OF IN-LINE FIBER TAPS AND FIBER CLADDING WAVEGUIDES
There is provided a device comprising an optical tap and waveguide in the core and cladding of an optical fiber together with a glass ferrule that is angle polished to provide a reflection surface (with or without total internal reflection) that produces a reflection of the light tapped from the optical fiber to reach the bottom of the glass ferrule and propagate in a direction that is perpendicular to (or at least different than the direction of propagation close to) the axis of the optical fiber. The fiber waveguide may be created using an ultrafast fabrication method and the glass ferrule can itself be modified by the same ultrafast laser technique to further manipulate the light traveling inside.
A device including an optical tap and waveguide in the core and cladding of an optical fiber together with a glass ferrule that is angle polished to provide a reflection surface (with or without total internal reflection) that produces a reflection of the light tapped from the optical fiber to reach the bottom of the glass ferrule and propagate in a direction that is perpendicular to (or at least different than the direction of propagation close to) the axis of the optical fiber. The fiber waveguide may be created using an ultrafast fabrication method and the glass ferrule can itself be modified by the same ultrafast laser technique to further manipulate the light traveling inside.
G02B 6/28 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux
G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques
G02B 6/293 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux avec des moyens de sélection de la longueur d'onde
20.
MM-wave SFCW radar and SAF based imaging inspection system
The present invention presents a flexible, stepped frequency, radar based, imaging inspection system. The imaging inspection system can be used in airports, seaport sites, borders, postal processing centres, and sensitive sites. It comprises a millimetre-wave Stepped Frequency Continuous Wave (SFCW) radar module (2) connected to a transmitting channel and a receiving channel. The transmitting channel may comprise a frequency upconvertor (8) and the receiving channel may comprise a frequency downconvertor (10). A digital signal processing unit (14) reconstructs a conductivity profile and a permittivity profile of an object under test (OUT) from measurement data collected via a phase-array antenna or a translational stage (18) based on synthetic aperture focusing (SAF).
G01S 13/88 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques
G01S 13/90 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour la cartographie ou la représentation utilisant des techniques d'antenne synthétique
G01S 13/38 - Systèmes pour mesurer la distance uniquement utilisant la transmission d'ondes continues, soit modulées en amplitude, en fréquence ou en phase, soit non modulées avec comparaison en phase du signal reçu avec le signal transmis au même moment dans lesquels l'on utilise plusieurs fréquences de modulation
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p. ex. systèmes du type radar primaireSystèmes analogues
G01V 8/00 - Prospection ou détection par des moyens optiques
21.
Multi-view planar near-field scattering tomography system
A multi-view planar near-field scattering tomography system is provided herein. In one aspect the system is developed based on the reformulated signal subspace approach. Utilized for solving the electromagnetic inverse scattering problem, the signal subspace approach is reformulated. The present invention pertains to a computationally efficient approach to an electromagnetic inverse scattering-based permittivity profile estimation technique. In a second aspect, the system is developed at the millimeter-wave and THz frequency range to ensure accuracy by eliminating the multipath effects and without the need for an Anechoic chamber or water as a background medium for clinical, security, and manufacturing applications.
G01R 27/32 - Mesure de l'atténuation, du gain, du déphasage ou des caractéristiques qui en dérivent dans des réseaux électriques quadripoles, c.-à-d. des réseaux à double entréeMesure d'une réponse transitoire dans des circuits comportant des constantes réparties
G01R 27/06 - Mesure des coefficients de réflexionMesure du rapport d'ondes stationnaires
G01N 22/00 - Recherche ou analyse des matériaux par l'utilisation de micro-ondes ou d'ondes radio, c.-à-d. d'ondes électromagnétiques d'une longueur d'onde d'un millimètre ou plus
G01R 29/08 - Mesure des caractéristiques du champ électromagnétique
22.
Method and system for simultaneous measurement of strain and temperature utilizing dual core fiber
There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G02B 6/32 - Moyens de couplage optique ayant des moyens de focalisation par lentilles
G01L 1/24 - Mesure des forces ou des contraintes, en général en mesurant les variations des propriétés optiques du matériau quand il est soumis à une contrainte, p. ex. par l'analyse des contraintes par photo-élasticité
G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
G01D 1/00 - Dispositions pour la mesure donnant des résultats autres que la valeur instantanée d'une variable, d'application générale
G01D 5/353 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec atténuation ou obturation complète ou partielle des rayons lumineux les rayons lumineux étant détectés par des cellules photo-électriques en modifiant les caractéristiques de transmission d'une fibre optique
23.
Method for the fabrication of optical waveguide devices in photonic crystal fibers and in waveguides with hollow structures
There is provided a method to fabricate optical taps and waveguide devices in photonic crystal fibers and other fibers with hollow structures. The method involves a preparation step, where the hollow holes inside the fiber are collapsed or partially modified locally; and a waveguide fabrication step, where a femtosecond laser is focused inside the fiber and used to produce optical waveguides that interact in the region that was previously modified in the preparation step.
C03B 37/15 - Finition des fibres ou filaments avec application de chaleur, p. ex. pour fabriquer des fibres optiques
B23K 26/53 - Travail par transmission du faisceau laser à travers ou dans la pièce à travailler pour modifier ou reformer le matériau dans la pièce à travailler, p. ex. pour faire des fissures d'amorce de rupture
G02B 6/28 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux
G02B 6/255 - Épissage des guides de lumière, p. ex. par fusion ou par liaison
24.
METHOD FOR THE FABRICATION OF OPTICAL WAVEGUIDE DEVICES IN PHOTONIC CRYSTAL FIBERS AND IN WAVEGUIDES WITH HOLLOW STRUCTURES
There is provided a method to fabricate optical taps and waveguide devices in photonic crystal fibers and other fibers with hollow structures. The method involves a preparation step, where the hollow holes inside the fiber are collapsed or partially modified locally; and a waveguide fabrication step, where a femtosecond laser is focused inside the fiber and used to produce optical waveguides that interact in the region that was previously modified in the preparation step.
There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G01L 1/24 - Mesure des forces ou des contraintes, en général en mesurant les variations des propriétés optiques du matériau quand il est soumis à une contrainte, p. ex. par l'analyse des contraintes par photo-élasticité
G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
G02B 6/32 - Moyens de couplage optique ayant des moyens de focalisation par lentilles
G01D 1/00 - Dispositions pour la mesure donnant des résultats autres que la valeur instantanée d'une variable, d'application générale
G01D 5/353 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec atténuation ou obturation complète ou partielle des rayons lumineux les rayons lumineux étant détectés par des cellules photo-électriques en modifiant les caractéristiques de transmission d'une fibre optique
26.
Method and system for simultaneous measurement of strain and temperature utilizing dual core fiber
There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G01L 1/24 - Mesure des forces ou des contraintes, en général en mesurant les variations des propriétés optiques du matériau quand il est soumis à une contrainte, p. ex. par l'analyse des contraintes par photo-élasticité
G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
G01D 1/00 - Dispositions pour la mesure donnant des résultats autres que la valeur instantanée d'une variable, d'application générale
27.
METHOD AND SYSTEM FOR SIMULTANEOUS MEASUREMENT OF STRAIN AND TEMPERATURE UTILIZING DUAL CORE FIBER
There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores.
G01D 5/353 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec atténuation ou obturation complète ou partielle des rayons lumineux les rayons lumineux étant détectés par des cellules photo-électriques en modifiant les caractéristiques de transmission d'une fibre optique
G01D 21/02 - Mesure de plusieurs variables par des moyens non couverts par une seule autre sous-classe
28.
METHOD AND SYSTEM FOR SIMULTANEOUS MEASUREMENT OF STRAIN AND TEMPERATURE
A method and system for simultaneously measuring strain and temperature characteristics of an object involves the attachment to the object of a pair of optical fibers having different refractive indices, the fibers being connected together at at least one end thereof, and directing laser light into at least one end of the fibers. The Brillouin frequency of each of the fibers is measure and the strain and temperature characteristics are calculated based on the coefficients of strain and temperature and the measured Brillouin frequencies of the fibers.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G01K 11/322 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques utilisant la diffusion de Brillouin
29.
Method and system for simultaneous measurement of strain and temperature
A method and system for simultaneously measuring strain and temperature characteristics of an object involves the attachment to the object of a pair of optical fibers having different refractive indices, the fibers being connected together at least one end thereof, and directing laser light into at least one end of the fibers. The Brillouin frequency of each of the fibers is measure and the strain and temperature characteristics are calculated based on the coefficients of strain and temperature and the measured Brillouin frequencies of the fibers.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
30.
DISTRIBUTED BRILLOUIN SENSOR SYSTEM BASED ON DFB LASERS USING OFFSET LOCKING
A distributed Brillouin sensor system is provided. The system has two distributed feedback (DFB) lasers, which are locked at the Brillouin frequency of the optical fiber through offset locking method by coupler splitting into two parts. The split parts are sent to two photodiodes, the outputs of which are sent to a mixer. A PID controller means follows the mixer and a current controller follows the PID controller. The lasers have a wavelength of 1550nm. The PID controller locks the frequency difference. An optical delay line is used to produce the frequency tuning of the two DFB lasers around the Brillouin frequency of the optical fibers. The lock-in amplifier is used to keep the DC level of the optical modulator at minimum.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G01D 5/353 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec atténuation ou obturation complète ou partielle des rayons lumineux les rayons lumineux étant détectés par des cellules photo-électriques en modifiant les caractéristiques de transmission d'une fibre optique
G01K 11/322 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques utilisant la diffusion de Brillouin
An adjustable focus connector with spring action is especially adapted for use with common FC or SAM fiber optic receptacles. The connector includes a ferrule holder which mounts a fiber-carrying ferrule at a distal end thereof. At its proximal end the ferrule holder is threadedly connected to a lead screw member. A thrust collar surrounds the ferrule holder and traps a compression spring in the cavity between the thrust collar and the ferrule holder. Because of appropriate interengagement between the components the ferrule holder cannot rotate relative to the trust collar. A traveler is threadedly connected to the lead screw and abuts against the thrust collar. A connection nut is provided at the distal end of the connector to connect it to the fiber optic receptacle. The spring action of the connector prevents damage to the fiber end during connection of the connector to the fiber optic receptacle.
An adjustable focus connector with spring action is especially adapted for use with common FC or SMA fiber optic receptacles. The connector includes a ferrule holder which mounts a fiber-carrying ferrule at a distal end thereof. At its proximal end the ferrule holder is threadedly connected to a lead screw member. A thrust collar surrounds the ferrule holder and traps a compression spring in the cavity between the thrust collar and the ferrule holder. Because of appropriate interengagement between the components the ferrule holder cannot rotate relative to the trust collar. A traveler is threadedly connected to the lead screw and abuts against the thrust collar. A connection nut is provided at the distal end of the connector to connect it to the fiber optic receptacle. The spring action of the connector prevents damage to the fiber end during connection of the connector to the fiber optic receptacle
A system and method for controlling an optical light source is provided. A current source drives the light source, while the voltage across and the current through the light source is measured. The voltage and current are converted to digital signals and sent to a neural network, which generates a modeled optical output power of the light source and a modeled value of the optical wavelength. A control circuit receives the modeled optical output power and wavelength and sends a control signal to the current source to minimize the difference between the desired power output and the modeled output power. In addition, a control signal is sent to a Pettier driver to control the temperature of a Pettier cooler in order to increase or decrease the wavelength emitted by a laser diode.
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