Patents Assigned to Neubrex Co., Ltd.
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Publication number: 20180252556Abstract: A distributed pressure, temperature, strain (DPTS) sensing cable includes at least two slotted fiber optic metal wires each having a slot groove extended along in an outer circumference of the wires to encapsulate optical fibers in the slot grooves. The two slotted fiber optic metal wires have characteristics different from each other.Type: ApplicationFiled: October 6, 2015Publication date: September 6, 2018Applicant: NEUBREX CO., LTD.Inventors: Kinzo KISHIDA, Yoshiaki YAMAUCHI
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Patent number: 10066973Abstract: A Brillouin backscattered spectrum is obtained in such a way that two optical pulse pairs each composed of two pulses of different durations and of the same phase and ? phase difference are launched into a sensing optical fiber; Brillouin backscattered lights produced by the optical pulse pairs are detected into signals for the respective optical pulse pairs; the signals are sampled with two window functions whose time widths are equal to respective pulse durations of the optical pulse pair and whose delay time is variable; each sampled signal is transformed with a predetermined transformation; products of the transformed signals are calculated; and subtraction between the products is performed.Type: GrantFiled: October 28, 2016Date of Patent: September 4, 2018Assignee: NEUBREX CO., LTD.Inventor: Tsuneo Horiguchi
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Patent number: 10028667Abstract: A fiber optic biodiagnostic sensor system includes a blood vessel insertable pressure distribution measurement device to be inserted in vivo into a blood vessel to measure distributions of temperature and pressure of an object to be measured along a predetermined site, the device having an SM optical fiber deformable by temperature and strain, a structural member being in contact with a portion of the optical fiber to convert pressure of the to-be-measured object to strain of the optical fiber; and an outer layer converting the optical fiber and the structural member. The sensor system further includes a measurement unit emitting laser light into the SM optical fiber, detecting a frequency shift produced in the scattered light, and calculating a blood pressure at a given position of the optical fiber from a pressure change and a strain change of the SM optical fiber that are calculated from the frequency shift.Type: GrantFiled: July 25, 2014Date of Patent: July 24, 2018Assignee: NEUBREX CO., LTD.Inventors: Kinzo Kishida, Yoshiaki Yamauchi
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Publication number: 20170356793Abstract: A distributed fiber optic acoustic detection device employs a novel distributed acoustic detection method using a phase noise cancelling distributed acoustic sensing (PNC-DAS) technique.Type: ApplicationFiled: January 21, 2015Publication date: December 14, 2017Applicant: NEUBREX CO., LTD.Inventors: Kenichi NISHIGUCHI, Kinzo KISHIDA, Che-Hsien LI
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Patent number: 9829352Abstract: Distributions of a Brillouin frequency shift and a Rayleigh frequency shift in optical fibers set up in a material are measured from scattered waves of pulse laser light entered into the optical fibers, and distributions of pressure, temperature, and strain of the material along the optical fibers at a measurement time point are analyzed using coefficients that are inherent to the set up optical fibers and correlate pressure, temperature, and strain of material with the Brillouin frequency shift and the Rayleigh frequency shift.Type: GrantFiled: August 7, 2013Date of Patent: November 28, 2017Assignees: RESEARCH INSTITUTE OF INNOVATIVE TECHNOLOGY FOR THE EARTH, NEUBREX CO., LTD.Inventors: Ziqiu Xue, Yoshiaki Yamauchi, Kinzo Kishida
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Publication number: 20170248448Abstract: A Brillouin backscattered spectrum is obtained in such a way that two optical pulse pairs each composed of two pulses of different durations and of the same phase and n phase difference are launched into a sensing optical fiber; Brillouin backscattered lights produced by the optical pulse pairs are detected into signals for the respective optical pulse pairs; the signals are sampled with two window functions whose time widths are equal to respective pulse durations of the optical pulse pair and whose delay time is variable; each sampled signal is transformed with a predetermined transformation; products of the transformed signals are calculated; and subtraction between the products is performed.Type: ApplicationFiled: October 28, 2016Publication date: August 31, 2017Applicant: NEUBREX CO., LTD.Inventor: Tsuneo HORIGUCHI
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Patent number: 9557196Abstract: In an optical fiber cable that includes an optical fiber core for measuring pressure and a multilayer armor cable for measuring temperature, an annular clearance space having a desired thickness is formed between the optical fiber core and the multilayer armor cable and fixing members for fixing the optical fiber core and the multilayer armor cable are provided at predetermined intervals in the axial direction of the optical fiber cable.Type: GrantFiled: April 3, 2014Date of Patent: January 31, 2017Assignees: RESEARCH INSTITUTE OF INNOVATIVE TECHNOLOGY FOR THE EARTH, NEUBREX CO., LTD.Inventors: Ziqiu Xue, Kinzo Kishida, Yoshiaki Yamauchi, Shinzo Suzaki
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Publication number: 20160220131Abstract: A fiber optic biodiagnostic sensor system includes a blood vessel insertable pressure distribution measurement device to be inserted in vivo into a blood vessel to measure distributions of temperature and pressure of an object to be measured along a predetermined site, the device having an SM optical fiber deformable by temperature and strain, a structural member being in contact with a portion of the optical fiber to convert pressure of the to-be-measured object to strain of the optical fiber; and an outer layer converting the optical fiber and the structural member. The sensor system further includes a measurement unit emitting laser light into the SM optical fiber, detecting a frequency shift produced in the scattered light, and calculating a blood pressure at a given position of the optical fiber from a pressure change and a strain change of the SM optical fiber that are calculated from the frequency shift.Type: ApplicationFiled: July 25, 2014Publication date: August 4, 2016Applicant: NEUBREX CO., LTD.Inventors: Kinzo KISHIDA, Yoshiaki YAMAUCHI
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Patent number: 9366526Abstract: A plurality of optical fibers is helically embedded in tubular installation layers on the outer circumferential surface of a shaped body having a circular cross section. A three-dimensional position of the shaped body after deformed produced by bend, torsion, or stretch due to external force is measured by utilizing frequency change or phase change of pulse laser light emitted into the optical fibers caused by Brillouin scattering and/or Rayleigh scattering occurring in the optical fiber deformed in accordance with the shaped body deformation.Type: GrantFiled: October 28, 2013Date of Patent: June 14, 2016Assignee: NEUBREX CO., LTD.Inventors: Yoshiaki Yamauchi, Kenichi Nishiguchi, Kinzo Kishida
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Patent number: 9360304Abstract: Under a known pressure is externally applied to a reference member to which an optical fiber is fixed, test light is allowed to enter the optical fiber, and at least one of a reference Brillouin measurement for determining a reference Brillouin frequency shift amount based on the Brillouin scattering phenomenon, and a reference Rayleigh measurement for determining a reference Rayleigh frequency shift amount based on the Rayleigh scattering phenomenon is performed. A Brillouin measurement coefficient or a Rayleigh measurement coefficient is determined from these calculation results. An optical fiber is fixed to a sample member, the volumetric change of which is unknown, and the same sample Brillouin measurement or sample Rayleigh measurement is performed to determine the frequency shift amount. The volumetric change of the sample member is determined from the sample Brillouin or the sample Rayleigh frequency shift amount, and from the Brillouin or the Rayleigh measurement coefficient.Type: GrantFiled: August 10, 2012Date of Patent: June 7, 2016Assignees: RESEARCH INSTITUTE OF INNOVATIVE TECHNOLOGY FOR TH, NEUBREX CO., LTD.Inventors: Ziqiu Xue, Yoshiaki Yamauchi, Kinzo Kishida
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Publication number: 20160116308Abstract: In an optical fiber cable that includes an optical fiber core for measuring pressure and a multilayer armor cable for measuring temperature, an annular clearance space having a desired thickness is formed between the optical fiber core and the multilayer armor cable and fixing members for fixing the optical fiber core and the multilayer armor cable are provided at predetermined intervals in the axial direction of the optical fiber cable.Type: ApplicationFiled: April 3, 2014Publication date: April 28, 2016Applicants: NEUBREX CO., LTD., RESEARCH INSTITUTE OF INNOVATIVE TECHNOLOGY FOR THE EARTHInventors: Ziqiu XUE, Kinzo KISHIDA, Yoshiaki YAMAUCHI, Shinzo SUZAKI
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Patent number: 9287972Abstract: A distributed optical fiber sound wave detection device is provided with an optical pulse emission unit that causes an optical pulse to be incident into the optical fiber, and a Rayleigh scattered light reception unit that receives Rayleigh scattered light produced inside the optical fiber. The optical pulse emission unit outputs the optical pulse that is modulated using a code sequence which has a predetermined length and by which the optical pulse is divided into a plurality of cells. The Rayleigh scattered light reception unit includes a phase variation derivation unit that performs demodulation corresponding to the modulation in the optical pulse emission unit on the Rayleigh scattered light and determines a phase variation thereof from the demodulated Rayleigh scattered light, and a sound wave detection unit that determines a sound wave that has struck the optical fiber from the phase variation determined by the phase variation derivation unit.Type: GrantFiled: September 11, 2012Date of Patent: March 15, 2016Assignee: NEUBREX CO., LTDInventors: Kinzo Kishida, Kenichi Nishiguchi, Che-Hsien Li
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Publication number: 20150285626Abstract: A plurality of optical fibers is helically embedded in tubular installation layers on the outer circumferential surface of a shaped body having a circular cross section. A three-dimensional position of the shaped body after deformed produced by bend, torsion, or stretch due to external force is measured by utilizing frequency change or phase change of pulse laser light emitted into the optical fibers caused by Brillouin scattering and/or Rayleigh scattering occurring in the optical fiber deformed in accordance with the shaped body deformation.Type: ApplicationFiled: October 28, 2013Publication date: October 8, 2015Applicant: NEUBREX CO., LTD.Inventors: Yoshiaki Yamauchi, Kenichi Nishiguchi, Kinzo Kishida
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Publication number: 20150219443Abstract: Under a known pressure is externally applied to a reference member to which an optical fiber is fixed, test light is allowed to enter the optical fiber, and at least one of a reference Brillouin measurement for determining a reference Brillouin frequency shift amount based on the Brillouin scattering phenomenon, and a reference Rayleigh measurement for determining a reference Rayleigh frequency shift amount based on the Rayleigh scattering phenomenon is performed. A Brillouin measurement coefficient or a Rayleigh measurement coefficient is determined from these calculation results. An optical fiber is fixed to a sample member, the volumetric change of which is unknown, and the same sample Brillouin measurement or sample Rayleigh measurement is performed to determine the frequency shift amount. The volumetric change of the sample member is determined from the sample Brillouin or the sample Rayleigh frequency shift amount, and from the Brillouin or the Rayleigh measurement coefficient.Type: ApplicationFiled: August 10, 2012Publication date: August 6, 2015Applicants: NEUBREX CO., LTD., RESEARCH INSTITUTE OF INNOVATIVE TECHNOLOGY FOR THE EARTHInventors: Ziqiu Xue, Yoshiaki Yamauchi, Kinzo Kishida
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Publication number: 20140255023Abstract: A distributed optical fiber sound wave detection device is provided with an optical pulse emission unit that causes an optical pulse to be incident into the optical fiber, and a Rayleigh scattered light reception unit that receives Rayleigh scattered light produced inside the optical fiber. The optical pulse emission unit outputs the optical pulse that is modulated using a code sequence which has a predetermined length and by which the optical pulse is divided into a plurality of cells. The Rayleigh scattered light reception unit includes a phase variation derivation unit that performs demodulation corresponding to the modulation in the optical pulse emission unit on the Rayleigh scattered light and determines a phase variation thereof from the demodulated Rayleigh scattered light, and a sound wave detection unit that determines a sound wave that has struck the optical fiber from the phase variation determined by the phase variation derivation unit.Type: ApplicationFiled: September 11, 2012Publication date: September 11, 2014Applicant: NEUBREX CO., LTD.Inventors: Kinzo Kishida, Kenichi Nishiguchi, Che-Hsien Li
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Patent number: 8699009Abstract: The present invention provides a distributed optical fiber sensor capable of measuring the strain and temperature of an object to be measured simultaneously and independently with high spatial resolution. A distributed optical fiber sensor FS is a distributed optical fiber sensor which uses an optical fiber 15 as a sensor, and a strain and temperature detector 14 measures a Brillouin frequency shift amount caused by a strain and a temperature generated in the optical fiber 15 by using a Brillouin scattering phenomenon, measures a Rayleigh frequency shift amount caused by the strain and temperature generated in the optical fiber 15 by using a Rayleigh scattering phenomenon, and calculates the strain and temperature generated in the optical fiber 15 from the measured Brillouin frequency shift amount and Rayleigh frequency shift amount.Type: GrantFiled: November 6, 2009Date of Patent: April 15, 2014Assignee: Neubrex Co., Ltd.Inventors: Che-Hsien Li, Kinzo Kishida, Kenichi Nishiguchi, Artur Guzik, Atsushi Makita, Yoshiaki Yamauchi
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Publication number: 20110228255Abstract: The present invention provides a distributed optical fiber sensor capable of measuring the strain and temperature of an object to be measured simultaneously and independently with high spatial resolution. A distributed optical fiber sensor FS is a distributed optical fiber sensor which uses an optical fiber 15 as a sensor, and a strain and temperature detector 14 measures a Brillouin frequency shift amount caused by a strain and a temperature generated in the optical fiber 15 by using a Brillouin scattering phenomenon, measures a Rayleigh frequency shift amount caused by the strain and temperature generated in the optical fiber 15 by using a Rayleigh scattering phenomenon, and calculates the strain and temperature generated in the optical fiber 15 from the measured Brillouin frequency shift amount and Rayleigh frequency shift amount.Type: ApplicationFiled: November 6, 2009Publication date: September 22, 2011Applicant: NEUBREX CO., LTDInventors: Che-Hsien Li, Kinzo Kishida, Kenichi Nishiguchi, Artur Guzik, Atsushi Makita, Yoshiaki Yamauchi
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Patent number: 7719666Abstract: A distributed optical fiber sensor uses a Brillouin scattering phenomenon to avoid manual adjustment and to measure strain and/or temperature with high accuracy and high spatial resolution. A stepwise optical light source generates an optical pulse having a stepwise distribution of intensity to increase toward the center, and a continuous light source generates continuous light on. The optical pulse is incident on a sensing optical fiber as probe light and the continuous light is incident as pump light to cause a Brillouin scattering phenomenon between the probe light and the pump light. A Brillouin time domain detector determines a Brillouin loss or gain spectrum from the light emerging from the sensing optical fiber and attributed to the Brillouin scattering phenomenon, and measures strain in and/or temperature of the sensing optical fiber in the longitudinal direction thereof based on the determined Brillouin loss or gain spectrum.Type: GrantFiled: June 25, 2004Date of Patent: May 18, 2010Assignee: Neubrex Co., Ltd.Inventors: Kinzo Kishida, Tekken Li, Shenbin Lin
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Patent number: 7542856Abstract: A structure monitor system comprising a measuring unit 3 for measuring distortions of the structure S at respective points on a boundary by using an optical fiber sensor 2 laid on the boundary of the structure, numerical analysis unit 5 for calculating a distortion at a specified point on the structure S by a numerical analysis method with distortions measured by the measuring unit as a boundary condition, and a display unit 6 for displaying information on an analysis distortion by the numerical analysis unit 5 in a association with a position on the structure S.Type: GrantFiled: July 2, 2003Date of Patent: June 2, 2009Assignee: Neubrex Co., Ltd.Inventors: Kinzo Kishida, Motohiro Nakano, Yoshiaki Yamauchi
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Publication number: 20080177482Abstract: A structure monitor system comprising a measuring unit 3 for measuring distortions of the structure S at respective points on a boundary by using an optical fiber sensor 2 laid on the boundary of the structure, numerical analysis unit 5 for calculating a distortion at a specified point on the structure S by a numerical analysis method with distortions measured by the measuring unit as a boundary condition, and a display unit 6 for displaying information on an analysis distortion by the numerical analysis unit 5 in a association with a position on the structure S.Type: ApplicationFiled: July 2, 2003Publication date: July 24, 2008Applicant: Neubrex Co., Ltd.Inventors: Kinzo Kishida, Motohiro Nakano, Yoshiaki Yamauchi