Including Physical Deformation Or Movement Of Waveguide Patents (Class 385/13)
  • Patent number: 9817189
    Abstract: Embodiments of present invention provide a digital dispersion compensation module. The digital dispersion compensation module includes a multi-port optical circulator; and a plurality of dispersion compensation units connected to the multi-port optical circulator, wherein at least one of the plurality of dispersion compensation units includes a fiber-bragg grating (FBG) having a first port and a second port; and an optical switch being capable of selectively connecting to one of the first port and the second port of the FBG, wherein the at least one of the plurality of dispersion compensation units is adapted to provide a positive dispersion to an optical signal, from the multi-port optical circulator, when the optical switch connects to the first port of the FBG and is adapted to provide a negative dispersion to the optical signal when the optical switch connects to the second port of the FBG.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: November 14, 2017
    Inventors: Tongqing Wang, Dobby Lam, Jinghui Li
  • Patent number: 9737198
    Abstract: The present invention relates, generally, to controlling a steerable instrument having an elongate body. More particularly, the present invention relates to a system and method for sensing the shape of a steerable instrument and controlling the steerable instrument in response to a control signal from a user input device and a shape signal corresponding to the sensed shape of at least a portion of the steerable instrument. The present invention also relates to a system for sensing the shape of a flexible instrument with an optical shape sensor.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: August 22, 2017
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Keith P. Laby, Robert M. Ohline, Christoph M. Pistor, Charles E. Swinehart, Bruce R. Woodley, Amir Belson
  • Patent number: 9709747
    Abstract: Embodiments of present invention provide a digital dispersion compensation module. The digital dispersion compensation module includes a multi-port optical circulator; and a plurality of dispersion compensation units connected to the multi-port optical circulator, wherein at least one of the plurality of dispersion compensation units includes a fiber-bragg grating (FBG) having a first port and a second port; and an optical switch being capable of selectively connecting to one of the first port and the second port of the FBG, wherein the at least one of the plurality of dispersion compensation units is adapted to provide a positive dispersion to an optical signal, from the multi-port optical circulator, when the optical switch connects to the first port of the FBG and is adapted to provide a negative dispersion to the optical signal when the optical switch connects to the second port of the FBG.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: July 18, 2017
    Inventors: Tongqing Wang, Dobby Lam, Jinghui Li
  • Patent number: 9588293
    Abstract: Various particular embodiments include a primary waveguide including an end section; cantilevered waveguides, each cantilevered waveguide including an end section disposed adjacent the end section of the primary waveguide; and control pins for applying an electrical bias to the cantilevered waveguides to selectively displace the end sections of the cantilevered waveguides away from the end section of the primary waveguide.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: March 7, 2017
    Assignee: International Business Machines Corporation
    Inventors: John J. Ellis-Monaghan, Brendan S. Harris, Vibhor Jain, Thomas Kessler, Yves T. Ngu, Sebastian T. Ventrone
  • Patent number: 9575254
    Abstract: Embodiments of present invention provide a digital dispersion compensation module. The digital dispersion compensation module includes a multi-port optical circulator; and a plurality of dispersion compensation units connected to the multi-port optical circulator, wherein at least one of the plurality of dispersion compensation units includes a fiber-bragg grating (FBG) having a first port and a second port; and an optical switch being capable of selectively connecting to one of the first port and the second port of the FBG, wherein the at least one of the plurality of dispersion compensation units is adapted to provide a positive dispersion to an optical signal, from the multi-port optical circulator, when the optical switch connects to the first port of the FBG and is adapted to provide a negative dispersion to the optical signal when the optical switch connects to the second port of the FBG.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: February 21, 2017
    Inventors: Tongqing Wang, Dobby Lam, Jinghui Li
  • Patent number: 9528893
    Abstract: An optical fiber sensor (100) can be used to measure pressure with high sensitivity and fine resolution. As a (108) at the end of the sensor expands or contracts, the spectrum of a beam reflected from the end of fiber shifts, producing a change linked to pressure exerted on the sensor. Novel aspects of the present inventive sensor include the direct bonding of a silica thin film diaphragm (110) to the optical fiber with localized or confined heating and a uniform thickness of the diaphragm. The resulting sensor has a diameter that matches the diameter of the optical fiber. Because the sensor is all silica, it does not from temperature-induced error. In addition, the sensor can be very sensitive because the diaphragm can be very thin; it can also make highly repeatable measurements due to its very uniform thickness.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: December 27, 2016
    Assignee: University of Massachusetts
    Inventors: Wenhui Wang, Xingwei Vivian Wang, Kai Sun, Nan Wu
  • Patent number: 9494416
    Abstract: Disclosed herein is a method for sensing one or more selected parameters related to a structure of interest, for example, the shape of an isolated structure. A cable is attached to the structure of interest at one or more attachment points. The cable contains one or more optical fibers. One or more light signals are transmitted into the one or more optical fibers and then detected to form a data set. The data set is compared with information known about the one or more attachment points to determine error values. The error values are then combined with the data set to determine the selected parameters associated with the structure.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: November 15, 2016
    Assignee: BAKER HUGHES INCORPORATED
    Inventors: Roger Glen Duncan, Matthew Thomas Raum, Christopher H. Lambert
  • Patent number: 9484146
    Abstract: The invention relates to a high voltage transformer (6) having a sensor system (30) for monitoring physical characteristic variables. In particular, said sensor system has at least one sensor (1) that comprises a glass fiber (3) with a sensor head (2). Said sensor head supports a plurality of Bragg gratings (7, 8, 9). An evaluation unit (10) is associated with the sensor system and is connected to the at least one sensor head via said glass fiber. The invention is based on the general inventive concept of arranging the sensors of the sensor system between successive windings (4, 5) of the high voltage transformer using spacers. In addition, the use of a plurality of Bragg gratings in the sensor head ensures that at least one of the Bragg gratings determines the actual physical characteristic variables such as temperature or contact force (A).
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: November 1, 2016
    Assignee: MASCHINENFABRIK REINHAUSEN GMBH
    Inventors: Ansgar Hinz, Frank Micksch
  • Patent number: 9459164
    Abstract: The present disclosure provides an optical sensing apparatus for measuring a change in a first property. The optical sensing apparatus comprises first and second optical fibre portions and a sensing region for exposing both the first and second optical fibre portions to a change in an applied force. The force is, or is related to, the first property and has a component that is transversal to the optical fibre portions. The apparatus further comprises a holder for holding the first and second optical fibre portions in the sensing region. The first and second optical fibre portions are arranged relative to each other such that the change in the force results in a first change of an optical property of the first optical fibre portion and in a second change of the optical property of the second optical fibre portion and wherein the first change differs from the second change.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: October 4, 2016
    Assignee: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION
    Inventors: John William Arkwright, Simon Adam Maunder, Hsiao-Chuan Wang
  • Patent number: 9453770
    Abstract: A strain measurement device is provided. The strain measurement device includes at least one filiform strain sensor and a support of longilinear shape on which the filiform strain sensor is positioned. The strain measurement device also includes a stiffener.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: September 27, 2016
    Assignee: AIRBUS OPERATIONS S.A.S.
    Inventors: Marc Sartor, Patricia Morgue, Manuel Paredes
  • Patent number: 9389070
    Abstract: A monitoring device is provided that is used for the monitoring of an area of building or land, including an optical strand used as a sensor, one optical source for emitting an optical emission signal transmitted in the optical strand, and one optical analogue detector for detecting an intensity of an optical return signal corresponding to the optical emission signal returning from the optical strand. The monitoring device is arranged as a compact unit and includes a controller for alternately activating and deactivating the emission of the optical source so that a ratio between the non-emission duration and the emission duration is greater than 5000. A monitoring system is also provided including such a monitoring device, and a monitoring method carried out in the monitoring device.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: July 12, 2016
    Assignee: OSMOS SA
    Inventor: Bernard Hodac
  • Patent number: 9360388
    Abstract: A pressure sensing system includes a pressure sensor, an optical fiber in operable communication with the pressure sensor, and a body having a diaphragm integrally formed therein and separated a distance from the optical fiber.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: June 7, 2016
    Assignee: BAKER HUGHES INCORPORATED
    Inventors: Carl W. Stoesz, Sydnee Marie Hammond
  • Patent number: 9329203
    Abstract: Methods for fabricating ultra-sharp nanoprobes can include the steps of providing a wafer, and patterning a silicon layer on the wafer with a plurality of geometric structures. The geometric structures can be patterned using electron-beam lithography or photolithography, and can have circular, triangular or other geometric shapes when viewed in top plan. The methods can further include the step of depositing a non-uniform cladding on the geometric structures using plasma enhanced chemical vapor deposition (PECVD) techniques, and then wet-etching the wafer. The non-uniform nature of the cladding can result in more complete etching in the areas where the cladding has lower density and incomplete etching in the areas of higher density of the non-uniform cladding. The different etching rates in the proximity of at least adjacent two geometric structures can result in the formation of ultra-sharp nanoprobes.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: May 3, 2016
    Assignee: The United States of America, as Represented by the Secretary of the Navy
    Inventors: Joanna Ptasinski, Stephen D. Russell
  • Patent number: 9304018
    Abstract: A measurement apparatus includes a body suit for a body that includes an appendage having a pivotable joint, the body suit comprising a sleeve to cover the appendage, wherein a first portion of the sleeve is configured to cover the pivotable joint. One or more multi-core optical fiber sensors is/are within or on the sleeve in a routing pattern that is substantially aligned with a longitudinal axis of the sleeve except within the first portion and that is at least partially transverse to the longitudinal axis within the first portion. An optical shape sensing system coupled to the one or more multi-core optical fiber sensors sends light into the one or more multi-core optical fiber sensors and determines a position of each of the multiple appendages based on reflected optical signal measurements detected from one or more multi-core optical fiber sensors.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: April 5, 2016
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Matthew A. Davis, Eugene Malinowski, Jason L. Chevalier, Alaina M. McGregor, Matthew Reaves
  • Patent number: 9297710
    Abstract: A method and device for the detection of impact events on a security barrier. A hollow rebar is farmed within a security barrier, whereby the hollow rebar is completely surrounded by the security barrier. An optical fiber passes through the interior of the hollow rebar. An optical transmitter and an optical receiver are both optically connected to the optical fiber and connected to optical electronics. The optical electronics are configured to provide notification upon the detection of an impact event at the security barrier based on the detection of disturbances within the optical fiber.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: March 29, 2016
    Assignee: U.S. Department of Energy
    Inventor: Ross E. Pies
  • Patent number: 9268086
    Abstract: A photonic apparatus comprises an integrated waveguide, an integrated resonator in the form of a microtoroid and a thermally reflowable film. The reflowable film comprises a first film area and a second film area. The reflowable film is one of a thin film and a stack of thin films. The first film area is thermally reflown, the microtoroid is formed in the thermally reflown first film area. The second film area is not reflown in the immediate vicinity of the microtoroid. The microtoroid is optically coupled to the integrated waveguide located on or located within one of or both of the first or second film areas. The first and second film areas are directly connected to each other. The microtoroid has an edge extending along a circumference. The microtoroid can be a non-inverted or an inverted microtoroid, wherein the second film area is inside or outside of the circumference.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: February 23, 2016
    Assignee: RWTH AACHEN
    Inventor: Jeremy Witzens
  • Patent number: 9264793
    Abstract: A wireless headset capable of receiving audio signals transmitted wirelessly and compatible for use in an MRI scanner is disclosed. The headset includes a first wireless module connected to the first earphone and a second wireless module connected to the second earphone. Each wireless module is electrically connected to a speaker in the respective earphone. The first wireless module receives the audio signal from a remote source and coordinates transmission of the audio signal to each of the speakers. The compact nature of each earphone minimizes the length of wire runs. In addition, the headset is made of materials having low magnetic susceptibility such that they will not be affected by the magnetic field from the MRI scanner.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: February 16, 2016
    Assignee: Neocoil, LLC
    Inventors: Brian Brown, Manuel J. Ferrer Herrera, Richard J. Smaglick
  • Patent number: 9243949
    Abstract: This application describes methods and apparatus for fiber optic distributed acoustic sensing (DAS) where microstructured fiber (202), such as holey fiber or photonic crystal fiber is used as the sensing fiber (104). The microstructured fiber is configured so to provide at least one of enhanced sensitivity to a given incident acoustic signal; an enhanced non-linear optical power threshold and directional sensitivity. By configuring the microstructured fiber to be more compliant than an equivalent solid fiber and/or provide a large refractive index variation in response to applied strain, the response to a given acoustic stimulus may be larger than for the equivalent fiber, Providing a hollow core may allow higher optical powers and by providing a directionality to microstructured (304) allows the fiber to be used in a DAS system with a directional response.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: January 26, 2016
    Assignee: OPTASENSE HOLDINGS LIMITED
    Inventors: Roger Ian Crickmore, Alastair Godfrey
  • Patent number: 9186047
    Abstract: An instrument system that includes an elongate instrument body and an optical fiber sensor is provided. The optical fiber sensor includes an elongate optical fiber that is coupled to the elongate instrument body, wherein a portion of the optical fiber is coupled to the elongate instrument body in a manner to provide slack in the fiber to allow for axial extension of the elongate instrument body relative to the optical fiber.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: November 17, 2015
    Assignee: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Bhaskar S. Ramamurthy, Neal A. Tanner, Robert G. Younge, Randall L. Schlesinger
  • Patent number: 9182253
    Abstract: An optical fiber attenuation sensor that includes a first protrusion movable between a first position and a second position, a second protrusion movable between a third position to a fourth position, and an elastic object coupled to the first protrusion that causes the first protrusion to move from the first position to the second position. When the first protrusion moves from the first position to the second position, the second protrusion moves from the third position to the fourth position. The second protrusion is configured and positioned to cause an event in a signal in an optical fiber when the second protrusion moves from the third position to the fourth position.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: November 10, 2015
    Assignee: AFL Telecommunications LLC
    Inventors: Wilfred Courchaine, Roger Vaughn, Theodore Lichoulas
  • Patent number: 9139468
    Abstract: Optical fiber sensors adapted to measure strain or pressure are disclosed. The optical fiber sensor has a lead-in optical fiber having an end surface at a forward end, and a first optical element having a body with an outer dimension, Do, a front end surface coupled to the lead-in optical fiber, a pedestal including a retracted surface that is spaced from the front end surface, the retracted surface at least partially defining an optical cavity, a gutter surrounding the pedestal, the gutter having a gutter depth defining an active region of length, L, the first optical element further exhibiting L/Do?0.5. Also provided are systems including the optical fiber sensor, and methods for manufacturing and using the optical fiber sensor. Numerous other aspects are provided.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: September 22, 2015
    Assignee: University of Maribor
    Inventors: Denis Donlagic, Simon Pevec, Edvard Cibula
  • Patent number: 9109944
    Abstract: The spatial resolution of a fiber optical Distributed Acoustic Sensing (DAS) assembly is enhanced by: arranging an optical DAS fiber with a series of contiguous channels that are sensitive to vibration in a U-shaped loop such that substantially parallel fiber sections include pairs of channels that are arranged at least partially side by side; transmitting a series of light pulses through the optical fiber and receiving back reflections of said light pulses by a light transmission and receiving assembly; and processing the received back reflections such that back reflections stemming from at least one pair of channels that are arranged at least partially side by side are correlated to each other.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: August 18, 2015
    Assignee: Shell Oil Company
    Inventors: Johannis Josephus Den Boer, Andre Franzen, Alex Groen, Daniel Joinson, Arthur Alexander Van Rooyen
  • Patent number: 9109978
    Abstract: A light hood for a fiber identifier tool that includes a head portion having interior photo detectors, a slot for receiving an optical fiber to be tested, and a clamp mechanism for urging the fiber to bend in the vicinity of the photo detectors when the mechanism is operated. The hood has a generally T-shaped body that defines a lower hood portion arranged to engage the clamp mechanism and operate the mechanism when the lower hood portion is pulled downward by a user. An upper hood portion of the body is configured so that when the lower hood portion is engaged with the clamp mechanism and pulled downward, the upper hood portion descends to cover the head portion of the tool including the slot. Outside light is then blocked from entering the slot and reaching the photo detectors whenever a fiber is tested by the tool, thus preventing false indications.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: August 18, 2015
    Assignee: OFS FITEL, LLC
    Inventors: Yue Liang, Denis E. Burek
  • Patent number: 9103736
    Abstract: A method, apparatus and computer-readable medium for determining deformation of a plurality of coupled members. A distributed strain sensor string on a first member is coupled to a distributed strain sensor string on a second member. Signals are obtained from the sensor strings. A subset of strain data relating to sensor strain on the first member and the second member is created. A virtual sensor string is created having a plurality of virtual sensors placed on the first and second members including a joint therebetween. Strain data of sensors in the distributed stain sensor strings is mapped to sensors in the virtual sensor string. The deformation of the plurality of coupled members is determined using the strain data of the virtual sensors.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: August 11, 2015
    Assignee: Baker Hughes Incorporated
    Inventors: Jianfeng Chen, Xudong Yang
  • Patent number: 9092955
    Abstract: The present invention relates to a laser apparatus for inducing a photo-mechanical effect. More particularly, the present invention relates to a laser apparatus for outputting a pulsed laser beam and inducing a photo-mechanical effect by controlling pulse energy of the pulsed laser beam.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: July 28, 2015
    Assignee: KONKUK UNIVERSITY INDUSTRIAL COOPERATION CORP
    Inventors: Soon Cheol Chung, Jae Hoon Jun, Jong Rak Park, Seungmoon Choi, Gu In Jung, Byung Chan Min, Hyung Sik Kim, Sung Phil Kim
  • Patent number: 9086340
    Abstract: A tubular insertion device includes a tubular insertion portion including a flexible portion in a predetermined part, bending sensors distributed and arranged in the flexible portion, and an operation support information calculating unit. The operation support information calculating unit extracts operation support information including at least first external force information regarding an external force applied to the tubular insertion portion by a combinational calculation based on detection information from the bending sensors.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: July 21, 2015
    Assignees: OLYMPUS CORPORATION, OLYMPUS MEDICAL SYSTEMS CORP.
    Inventors: Eiji Yamamoto, Ryo Tojo, Jun Hane, Jun Hasegawa
  • Patent number: 9014518
    Abstract: A bearing comprises a Bragg grated optical fiber to measure one or more parameters of the bearing. The optical fiber is coupled to the bearing in such a way that at least a part of the optical fiber that comprises Bragg grating is curved. The grating which is curved is adapted to the curvature in such a way that the frequency response is well defined and not spread out. This is achieved by arranging the gratings such that even though the fiber is curved the gratings appear to be substantially parallel instead of being influenced by the curvature.
    Type: Grant
    Filed: November 26, 2010
    Date of Patent: April 21, 2015
    Assignee: Aktiebolaget SKF
    Inventor: Adam Reedman
  • Publication number: 20150098673
    Abstract: A method of correlating physical locations with respective positions along an optical waveguide can include transmitting to the waveguide a signal including an indication of the transmitting location, and the waveguide receiving the signal. A system for correlating a physical location with a position along an optical waveguide can include a transmitter which transmits to the optical waveguide a signal including an indication of the transmitter location, and a computer which correlates the location to the position, based on the signal as received by the waveguide. A method of determining a position along an optical waveguide at which a signal is transmitted can include modulating on the signal an indication of a transmission location, and transmitting the signal to the waveguide, thereby causing vibration of the waveguide.
    Type: Application
    Filed: October 9, 2013
    Publication date: April 9, 2015
    Applicant: HALLIBURTON ENERGY SERVICES, INC.
    Inventors: David A. BARFOOT, Paul H. MCPHAIL
  • Patent number: 9002153
    Abstract: The present invention relates to an optical fiber cable net including: one elongated optical fiber cable having a front end portion repeatedly moved upward and downward from the lower end portion of the left side of a bee hive-like section along a line forming the bee hive-like section, the optical fiber cable being wound by a plurality of times onto pre-disposed portions where it meets the pre-disposed portions and being moved upward or downward, so that if the front end portion of the optical fiber cable reaches the lower end portion of the right side of the bee hive-like section, the front end portion of the optical fiber cable is sequentially passed through the respective net eyes of the right side of the bee hive-like section, the respective net eyes of the upper side thereof and the respective net eyes of the left side thereof.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: April 7, 2015
    Inventor: Hong Gi Chun
  • Publication number: 20150091875
    Abstract: Pressure-sensing touch systems and methods are disclosed for sensing the occurrence of a touch event based on pressure applied at a touch location. The touch system includes a light-source system and a detector system operably adjacent respective input and output edges of a waveguide. Pressure at a touch location on the waveguide gives rise to a touch event causes the waveguide to bend or flex. The waveguide bending causes a change in the optical paths of light traveling by FTIR, causing the light distribution in the output light to change. The changes are detected and are used to determine whether a touch event occurred, as well as the time-evolution of the touch event. The changes in the output light can include polarization changes caused by birefringence induced in the waveguide by the applied pressure applied. Various detector configurations are disclosed for sensing the location and pressure of a touch event.
    Type: Application
    Filed: August 15, 2014
    Publication date: April 2, 2015
    Inventor: Ming-Jun Li
  • Patent number: 8989528
    Abstract: Systems and methods comprise or involve optical fibers having Bragg gratings. The optical fibers can be assembled in a parallel manner into a fiber sensor configuration. Bragg gratings can be written onto different cores of optical fibers. Bragg gratings may be written at a same or nearly same axial position for all optical fibers in the configuration and may be written at the same time and may have a substantially equal index of refraction variation and unequal lengths. Spaced Bragg gratings may also have characteristic sidelobe spectrums for tagging the respective gratings. Gratings can also be written at different wavelengths and over another grating at the same location.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: March 24, 2015
    Assignee: Hansen Medical, Inc.
    Inventor: Eric Udd
  • Patent number: 8989527
    Abstract: The location of one or more fiber optic channels (16) along the length of a fiber optic cable (12) is determined by: a) arranging an electrical conductor and a magnetic source at a known location adjacent to at least one of the channels (16); b) transmitting an electrical current through the electrical conductor, thereby deforming the electrical conductor by Lorenz forces in the vicinity of the magnetic source; c) conveying the deformation of the electrical conductor to deform an adjacent channel (16); d) transmitting light pulses through the fiber optic cable (12) and using variations in the light pulses back reflected by the deformed channel (16) and the known location of the magnetic source to determine the location of the deformed channel (16).
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: March 24, 2015
    Assignee: Shell Oil Company
    Inventor: Daniel Joinson
  • Publication number: 20150077740
    Abstract: A reinforcing cable for a prestressed concrete structure is disclosed. The cable has an optical fiber entwined between the twisted wire ropes that form the cable. The optical fiber facilitates in situ monitoring of cable integrity by comparing optical signal transmission over time.
    Type: Application
    Filed: November 1, 2011
    Publication date: March 19, 2015
    Applicant: Empire Technology Development LLC
    Inventor: Machiko Fuse
  • Patent number: 8983243
    Abstract: Wind turbine blade comprising a sensor system with an optical path comprising a first optical sensor fiber, a second optical sensor fiber and a patch optical fiber, the first optical sensor fiber including a first core with a first core diameter wherein the first optical sensor fiber extends from a first end to a second end and comprising at least one sensor, the second optical sensor fiber including a second core with a second core diameter, wherein the second optical sensor fiber extends from a first end to a second end and comprising at least one sensor, the patch optical fiber including a patch core with a patch core diameter, wherein the patch optical fiber extends from a first end to a second end and connects the first optical sensor fiber and the second optical sensor fiber, wherein the first core diameter is the same as the patch core diameter.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: March 17, 2015
    Assignee: LM WP Patent Holding A/S
    Inventors: Morten Philipsen, Lars Erik Jensen
  • Publication number: 20150069996
    Abstract: An optical fiber for a sensor that can measure a current or a voltage precisely is provided. The optical fiber for the sensor 10 comprises: an FBG 12 wherein a refractive index of a core changes periodically; a metal layer 13 for sheathing the FBG 12; and a pair of electrodes 14 and 15 provided at the metal layer 13. The electrodes 14 and 15 are connected to an object to be measured in desired positions. Current flowing through the metal layer 13 is calculated based on variation in Bragg wavelength of the FBG 12.
    Type: Application
    Filed: January 21, 2013
    Publication date: March 12, 2015
    Applicants: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, INSTITUTE OF NATIONAL COLLEGES OF TECH, JAPAN, NATIONAL UNIVERSITY CORPORATION KAGAWA UNIVERSITY
    Inventors: Ko Imaoka, Yoshifumi Suzaki, Hiromu Iwata, Kiyoshi Nakagawa
  • Publication number: 20150049981
    Abstract: An optical-based sensing apparatus and method are provided. A sensing apparatus (10) may include a tube (30). An optical fiber (12) may be encased in the tube. A buffering layer (14) may be interposed between the optical fiber and the tube. The buffering layer and/or the tube may be selectively configured to form along a length of the apparatus a plurality of optical sensing zones (16, 18, 20) spatially arranged to sense parameters involving different parameter modalities.
    Type: Application
    Filed: August 16, 2013
    Publication date: February 19, 2015
    Applicant: General Electric Company
    Inventors: Mahadevan NMN Balasubramaniam, Glen Peter Koste, Slawomir Rubinsztajn, Sachin Narahari Dekate, Anurag Kasyap Vejjupalle Subramanyam, Sunilkumar Onkarnath Soni
  • Publication number: 20150033868
    Abstract: A transversal load insensitive optical waveguide includes a primary section having a core. The waveguide may further include an outer cladding. The primary section includes a primary section surface and the outer cladding includes an exterior surface mechanically attached to the primary section surface by an interior cladding structure forming a mechanical connection. The cladding structure is such that for at least part of a distance between each two radial corresponding points on the exterior surface and the primary section surface respectively, the mechanical connection deviates from being radial, so that a radially-directed load on an exterior surface of the outer cladding is deflected by the cladding structure.
    Type: Application
    Filed: January 25, 2013
    Publication date: February 5, 2015
    Inventors: Lun Kai Cheng, Peter Martijn Toet
  • Patent number: 8937713
    Abstract: A long-distance fiber optic monitoring system having a sensing unit and an analyzer that is remotely located from the sensing unit is provided. The sensing unit comprises a source of optical energy for injecting optical energy into the fiber optical cable and an optical detector configured to detect an optical return signal from the optical fiber. The detected optical return signal is associated with an acoustic signal impinging on the optical fiber. The analyzer receives a signal from the remote sensing unit via the optical fiber that is representative of the optical return signal, and determines a location of a disturbance based at least on the received signal. The representative signal can be transmitted from the remote sensing unit to the analyzer as an optical signal or via a metallic wired included with the optical fiber.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: January 20, 2015
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: John Sinclair Huffman
  • Patent number: 8929690
    Abstract: A fuse state indicator for a cascading fuse multiple discharge device including a fiber optic cable having a first end, a second end, and an intermediate segment. The intermediate segment is configured for attachment to a fuse assembly of a fuse panel where the fuse panel is arranged for physically severing the intermediate segment of the fiber optic cable in response to discharge of the fuse assembly.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: January 6, 2015
    Inventors: Timothy J. Doering, Aaron Ephraim Bard
  • Patent number: 8923663
    Abstract: The invention relates to a distributed fiber optic sensor (104, 106) having a first spatial resolution (301, 303) and a second, different, spatial resolution (302, 304). The sensor, which may be a distributed acoustic sensor, has an optical source (112) configured to interrogate an optical fiber (104) with optical radiation and a detector (116) configured to detected optical radiation back-scattered from within the fiber. A processor (108) is configured to process the detected back-scatter radiation to provide a plurality of longitudinal sensing portions of fiber. The optical source and processor are adapted to provide the first and second spatial resolutions, for instance by changing the duration and/or separation of the optical pulses and analysis bins. The first and second spatial resolutions may be provided sequentially or simultaneously and the spatial resolution used may be varied as part of a default pattern or in response to a detection event.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: December 30, 2014
    Assignee: Optasense Holdings Limited
    Inventors: David John Hill, Magnus McEwen-King
  • Publication number: 20140375980
    Abstract: Optic fiber sensor characterized in that the sensing fiber is provided with a continuous Bragg grating covering the entire fiber length which is dedicated to sensing and along which spatially resolved measurements are performed.
    Type: Application
    Filed: December 19, 2012
    Publication date: December 25, 2014
    Inventors: Sang Hoon Chin, Luc Thevenaz
  • Patent number: 8913855
    Abstract: A getting-on/off determination apparatus determines rider's getting-on/off for an inverted two-wheel vehicle that travels while maintaining the inverted state. The getting-on/off determination apparatus includes an optical fiber laid in a step portion that a rider gets on/off, a light emitting unit that emits detection light and is connected to one end of the optical fiber, a light receiving unit that receives the detection light emitted from the light emitting unit and is connected to another end of the optical fiber, at least one transmitted light varying portion that varies an amount of transmitted light of the detection light passing through the optical fiber in conjunction with a vertical displacement of the step portion that occurs when the rider gets on/off the inverted two-wheel vehicle, and a determination unit that determines getting-on/off of the rider based on an amount of the detection light received by the light receiving unit.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: December 16, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Norimasa Kobori, Takahiro Nakayama, Kazuhiro Mima, Hitoshi Yamada
  • Patent number: 8902195
    Abstract: An input panel for an interactive input system comprises an optical waveguide; a first radiation source directing radiation into said optical waveguide, said radiation undergoing total internal reflection within said optical waveguide; a diffusion layer adjacent to and on one side of the optical waveguide, totally internally reflected light being frustrated and escaping the optical waveguide in response to pointer contacts on the diffusion layer; a second radiation source directing radiation towards another side of the optical waveguide that is opposite the one side; and at least one imaging device having a field of view looking at the optical waveguide and capturing image frames, wherein said first and second radiation sources are turned on and off in succession and wherein said first radiation source is turned off when said second radiation source is on and wherein said first radiation source is turned on when said second radiation source is off.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: December 2, 2014
    Assignee: SMART Technologies ULC
    Inventors: Grant McGibney, Gerald Morrison, Charles Ung, Trevor Akitt, Ed Tse, Erik Benner, Jamie Duncalf
  • Publication number: 20140345388
    Abstract: A distributed fiber optic acoustic sensing system comprises an elongate body having an outer surface, an optical fiber disposed on the outer surface at a first predetermined wrap angle, and light transmitting and receiving means optically connected to the fiber for. The elongate body may include at least one substantially flat face, and/or a layer of swellable elastomer surrounding the body, and/or an outer elastomeric tube surrounding the elastomer layer. There may be at least one sensor pad disposed in the outer layer, the sensor pad comprising a stiffener and at least one longitudinal fiber affixed thereto or embedded therein. There may be a body of protective material surrounding the tube, which may have an outer surface that includes at least one substantially flat face and at least one sensor pad disposed in the body.
    Type: Application
    Filed: December 13, 2012
    Publication date: November 27, 2014
    Inventors: Johannis Josephus Den Boer, Albena Alexandrova Mateeva, Jeremiah Glen Pearce, Jeffery Joseph Mestayer, William Birch, Jorge Louis Lopez, Kees Hornman
  • Publication number: 20140334767
    Abstract: An apparatus and method for measuring bending of an object, a position of an item touching the object, and a shearing force of the item using an optical waveguide may include a frequency measurer to measure a frequency of light reflected from a grating of an optical waveguide, and a bending measurer to determine bending of an object to which the optical waveguide is attached using the frequency.
    Type: Application
    Filed: March 6, 2014
    Publication date: November 13, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Soo Chul LIM, Joon Ah PARK, Hyun Jeong LEE, Seong Ju HAN, Kyung Won MOON
  • Patent number: 8879874
    Abstract: An intruder detection system including a light emitting unit, a light guide, and a light receiving unit. The light emitting unit is arranged to emit light into the light guide and the light guide is arranged to guide the light to the light receiving unit. The impact of an intruder on the light guide causes changes in the characteristics of the light received at the light receiving unit.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: November 4, 2014
    Assignee: Perimeter Security Industries Pty Ltd
    Inventor: Dean Vey
  • Publication number: 20140321800
    Abstract: A sensor is disclosed herein. The sensor includes a fiber operable to communicate a light wave. The sensor also includes at least first and second Fiber Bragg Gratings disposed along the fiber. The sensor also includes a structure operable to be deformed in a plane of deformation. The at least first and second Fiber Bragg Gratings are disposed on opposite sides of the structure in the plane of deformation. The sensor also includes an interrogation unit operable to receive first and second signals corresponding to first and second wavelengths from the at least first and second Fiber Bragg Gratings. The first signal is associated with the first Fiber Bragg Grating and the second signal is associated with the second Fiber Bragg Grating.
    Type: Application
    Filed: July 7, 2014
    Publication date: October 30, 2014
    Inventors: Mike McNeilly, Donald R. Way
  • Publication number: 20140321799
    Abstract: A sensor comprising an optical fiber that includes a Bragg grating and a longitudinal-strain-inducing (LSI) jacket for inducing longitudinal strain into the optical fiber as a function of a transverse load, i.e., pressure or force. As the LSI jacket induces strain into the optical fiber, the fiber grating deforms, thereby changing the character of light reflected from the grating. The changes in character of the reflected light can be measured using suitable optical instrumentation. Additional physical characteristics that can be measured/sensed using an LSI-jacket-based sensor include moisture content/presence, chemical content/presence, and temperature. A transverse-load-sensing sensor can include transverse-load-applying structures that compress the LSI jacket under transverse load, causing the jacket to controllably elongate and thereby induce longitudinal strain into the optical fiber. Chemical and moisture LSI jackets can comprise materials that swell in the presence of the chemical or moisture.
    Type: Application
    Filed: April 25, 2014
    Publication date: October 30, 2014
    Inventor: Eric Udd
  • Patent number: 8873064
    Abstract: A fiber-optic sensor can have a Michelson sensor portion and a Mach-Zehnder sensor portion. A first splitter-coupler can be configured to split incoming light between a first fiber portion and a second fiber portion. A first polarization-phase conjugation device can be configured to conjugate a polarization phase of incident light corresponding to the first fiber portion, and a second polarization-phase conjugation device can be configured to conjugate a polarization phase of incident light corresponding to the second fiber portion. Each of the first and second polarization-phase conjugation devices can be configured to reflect light toward a detector and through the respective first and second fiber portions. A coupler can be configured to join light in the first fiber portion with light in the second fiber portion, and a third fiber portion can be configured to receive light from the coupler and to illuminate a second detector.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: October 28, 2014
    Assignee: Fibersonics Inc.
    Inventor: Edward Tapanes
  • Patent number: 8873900
    Abstract: An apparatus and method for determining an expanded diameter of a catheter balloon. An optical sensor includes an elongated optical fiber with at least one diffraction grating formed in a core of a distal portion thereof. The fiber distal portion is coupled to the inflatable balloon. Broadband light is transmitted to the diffraction grating by an optical interrogator. A portion of the light is reflected from the diffraction grating and is received by a wavelength detector. The wavelength of the reflected portion of light is dependent on the strain applied to the diffraction grating. The wavelength detector determines the strain in the balloon and correlates the strain to the diameter of the balloon.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: October 28, 2014
    Assignee: Medtronic Vascular, Inc.
    Inventors: Patricia O'Beirne, Aram Jamous, John Kelly