Patents by Inventor Kazushi Uno

Kazushi Uno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200400511
    Abstract: A detection device includes: an optical fiber including: a first part, when a plurality of panels each having a first section in which a plurality of superheater tubes with steam flowing inside the superheater tubes linearly extends in parallel to form a row and a second section in which the superheater tubes bend to separate from the first section in two sets and are radially connected to a side surface of a header is provided in an extending direction of the header and a direction in which the superheater tubes form a row in each panel is orthogonal to the extending direction of the header, laid along the superheater tubes in the first section of one panel from among the panels; a second part extending toward another panel adjacent to the one panel; and a third part laid along the superheater tubes in the first section of the other panel.
    Type: Application
    Filed: September 4, 2020
    Publication date: December 24, 2020
    Applicant: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka
  • Patent number: 10775245
    Abstract: A temperature measurement device includes: a light source configured to input a light into an optical fiber; a detector configured to detect a Stokes component and an anti-Stokes component from a back scattering light from the optical fiber; a memory; and a processor configured to execute a process, the process comprising: in a predetermined region including a sample point of the optical fiber, calculating a range including the sample point in accordance with a largeness of a correlation between the Stokes component and the anti-Stokes component; smoothing the Stokes component and the anti-Stokes component in the range; and measuring a temperature of the sample point with use of the Stokes component and the anti-Stokes component that are smoothed by the corrector.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: September 15, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka, Hiroyuki Fukuda
  • Patent number: 10712211
    Abstract: A temperature measurement device includes: a detector to detect first Stokes and anti-Stokes components when a light is input into a first end of an optical fiber and detect second Stokes and anti-Stokes components when a light is input into a second end; and a processor to execute a process including: calculating a first section from a first correlation between the second Stokes component and at least one of the first Stokes and the first anti-Stokes components, calculating a second section from a second correlation between the second anti-Stokes component and at least one of the first Stokes and the first anti-Stokes components, smoothing the second Stokes component in the first section, smoothing the second anti-Stokes component in the second section; and measuring a temperature by using the second Stokes and the second anti-Stokes components after smoothing, the first Stokes component and the second Stokes component.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: July 14, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka, Hiroyuki Fukuda
  • Patent number: 10704964
    Abstract: A temperature measurement device includes: a detector to detect a first Stokes component and a first anti-Stokes component when a light is input into a first end of an optical fiber and detect a second Stokes component and a second anti-Stokes component when a light is input into a second end; and a processor configured to execute a process comprising: replacing the second anti-Stokes component with a value according to the first Stokes component, the first anti-Stokes component and the second Stokes component when any one of correlations of the second anti-Stokes component to the first Stokes component and the first anti-Stokes component is less than or equal to a threshold value; and measuring a temperature at the sample point by using the first Stokes component, the first anti-Stokes component, the second Stokes component, and the second anti-Stokes component that is replaced in the replacing.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: July 7, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka, Hiroyuki Fukuda
  • Publication number: 20200116574
    Abstract: A temperature measurement apparatus includes: a plurality of optical fibers arranged along a predetermined path; a temperature measurement unit that measures a temperature distribution of the plurality of optical fibers in an extending direction on the basis of backscattered light from the optical fibers; and an averaging processing unit that averages, on the basis of a correlation among a plurality of temperature distributions measured by the temperature measurement unit in the predetermined path, the plurality of temperature distributions in a distance direction of the optical fibers.
    Type: Application
    Filed: December 13, 2019
    Publication date: April 16, 2020
    Applicant: FUJITSU LIMITED
    Inventors: Takahiro Arioka, Kazushi Uno, Takeo Kasajima
  • Publication number: 20200072681
    Abstract: A temperature measurement apparatus includes an optical fiber disposed along a predetermined path, the optical fiber having two sections provided in front of and behind a predetermined section, the two sections allowing acquisition of respective identical temperature distributions; a light source configured to cause light to enter into the optical fiber; and a processor coupled to the light source and configured to: measure a temperature distribution in an extension direction of the optical fiber, based on backward scattered light from the optical fiber, and correct the measured temperature distribution in the predetermined section, by using a Stokes component and an anti-Stokes component contained in the backward scattered light in each of the two sections.
    Type: Application
    Filed: November 8, 2019
    Publication date: March 5, 2020
    Applicant: FUJITSU LIMITED
    Inventors: Takahiro Arioka, Kazushi Uno, Takeo Kasajima
  • Patent number: 10422751
    Abstract: An optical fiber cord includes: an optical fiber; and a cover material covering the optical fiber, the cover material being formed by braiding a plurality of yarns. Moreover, an abnormality detection system includes: the optical fiber covered with the cover material formed by braiding the plurality of yarns; a scattered light detector configured to detect scattered light occurring in the optical fiber and output data on intensity distribution in a longitudinal direction of the optical fiber; and a data processor configured to determine the presence or absence of an abnormality based on the data outputted from the scattered light detector.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: September 24, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Fumio Takei, Takeo Kasajima
  • Patent number: 10281340
    Abstract: A temperature measuring system includes a laser light source to emit optical pulses, an optical fiber, arranged to pass through a plurality of measuring points, and input with the optical pulses, and a measuring device to detect back-scattering light output from the optical fiber and measure a temperature at the plurality of measuring points, to acquire measured temperature data. The measuring device computes corrected temperature data by varying a degree of smoothing the measured temperature data in a distance direction of the optical fiber, according to a correlation between the measured temperature data and a transfer function peculiar to the temperature measuring system.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: May 7, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Takahiro Arioka, Kazushi Uno, Takeo Kasajima, Fumio Takei, Hiroyuki Fukuda
  • Patent number: 10267689
    Abstract: A temperature measuring system includes a laser light source that emits optical pulses, an optical fiber, arranged to pass through a plurality of temperature measuring points, and input with the optical pulses, and a measuring device that detects back-scattering light output from the optical fiber and measures a temperature at the plurality of measuring points, to acquire measured temperature data. The measuring device computes corrected temperature data by varying a degree of averaging of the measured temperature data in a time direction, according to whether a time-sequential difference temperature data have a spatial correlation or a time correlation within a range that uses a target position of the optical fiber as a reference.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: April 23, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Takahiro Arioka, Kazushi Uno, Takeo Kasajima, Fumio Takei, Hiroyuki Fukuda
  • Patent number: 10247622
    Abstract: A temperature measurement device includes: an optical fiber that is arranged along a predetermined path; a light source configured to input a light into the optical fiber; a measurer configured to measure temperature distribution information in an extension direction of the optical fiber based on a back-scattering light from the optical fiber; and a corrector configured to make a filter for reducing a noise component of temperature distribution information measured by the measurer based on a difference of temperature distribution information between two different regions of the optical fiber in which a common temperature distribution is obtained, and correct the temperature distribution information by applying the filter to the temperature distribution information.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: April 2, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Takahiro Arioka, Kazushi Uno, Takeo Kasajima, Hiroyuki Fukuda
  • Patent number: 10088342
    Abstract: An abnormality detection system includes an optical fiber, a backscattered light detector, and a data processor. The backscattered light detector is connected to one end side and the other end side of the optical fiber, and configured to acquire a first intensity distribution of backscattered light by making light incident on the optical fiber from the one end side and to acquire a second intensity distribution of backscattered light by making light incident on the optical fiber from the other end side. The data processor calculates transmission loss at each position in the longitudinal direction of the optical fiber by using the first and second intensity distributions and a normalization function, and determines whether or not there is an abnormality based on the result of the calculation.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: October 2, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Fumio Takei, Takeo Kasajima
  • Publication number: 20180143085
    Abstract: A temperature measurement device includes: a detector to detect first Stokes and anti-Stokes components when a light is input into a first end of an optical fiber and detect second Stokes and anti-Stokes components when a light is input into a second end; and a processor to execute a process including: calculating a first section from a first correlation between the second Stokes component and at least one of the first Stokes and the first anti-Stokes components, calculating a second section from a second correlation between the second anti-Stokes component and at least one of the first Stokes and the first anti-Stokes components, smoothing the second Stokes component in the first section, smoothing the second anti-Stokes component in the second section; and measuring a temperature by using the second Stokes and the second anti-Stokes components after smoothing, the first Stokes component and the second Stokes component.
    Type: Application
    Filed: November 2, 2017
    Publication date: May 24, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka, Hiroyuki Fukuda
  • Patent number: 9915620
    Abstract: An abnormality detection system includes an optical fiber, a Raman scattered light detection unit, and a data processing unit. The detection unit is configured to detect Stokes light and anti-Stokes light which are generated in the optical fiber and to output data on the intensity distribution of the Stokes light in the optical fiber in the length direction thereof and data on the intensity distribution of the anti-Stokes light in the optical fiber in the length direction. The processing unit is configured to calculate the product of a value obtained by applying an FIR filter to the intensity distribution of the Stokes light, and a value obtained by applying the FIR filter to the intensity distribution of the anti-Stokes light for each of locations on the optical fiber in the length direction, and to determine whether or not abnormality is present based on the result of the calculation.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: March 13, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Fumio Takei, Takeo Kasajima, Kyoko Tadaki, Minoru Ishinabe
  • Publication number: 20180058948
    Abstract: A temperature measurement device includes: a detector to detect a first Stokes component and a first anti-Stokes component when a light is input into a first end of an optical fiber and detect a second Stokes component and a second anti-Stokes component when a light is input into a second end; and a processor configured to execute a process comprising: replacing the second anti-Stokes component with a value according to the first Stokes component, the first anti-Stokes component and the second Stokes component when any one of correlations of the second anti-Stokes component to the first Stokes component and the first anti-Stokes component is less than or equal to a threshold value; and measuring a temperature at the sample point by using the first Stokes component, the first anti-Stokes component, the second Stokes component, and the second anti-Stokes component that is replaced in the replacing.
    Type: Application
    Filed: October 20, 2017
    Publication date: March 1, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka, Hiroyuki Fukuda
  • Publication number: 20180058947
    Abstract: A temperature measurement device includes: a light source configured to input a light into an optical fiber; a detector configured to detect a Stokes component and an anti-Stokes component from a back scattering light from the optical fiber; a memory; and a processor configured to execute a process, the process comprising: in a predetermined region including a sample point of the optical fiber, calculating a range including the sample point in accordance with a largeness of a correlation between the Stokes component and the anti-Stokes component; smoothing the Stokes component and the anti-Stokes component in the range; and measuring a temperature of the sample point with use of the Stokes component and the anti-Stokes component that are smoothed by the corrector.
    Type: Application
    Filed: October 20, 2017
    Publication date: March 1, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takeo Kasajima, Takahiro Arioka, Hiroyuki Fukuda
  • Publication number: 20180031428
    Abstract: A determination device includes: a memory; and a processor coupled to the memory and the processor configured to executes a process, the process comprising: generating a reference model of a sensor detection value; determining whether a time from a predetermined point in time until a deviation between the reference model and the sensor detection value exceeds a threshold is shorter than a predetermined time; and outputting a signal associated with an abnormality when the time is determined to be shorter.
    Type: Application
    Filed: August 14, 2017
    Publication date: February 1, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Kazushi Uno, Takahiro Arioka, Takeo Kasajima, Hiroyuki FUKUDA
  • Patent number: 9816878
    Abstract: A temperature measurement system includes an optical fiber, a temperature distribution measurement apparatus, and a data processing apparatus. The temperature distribution measurement apparatus is configured to detect backscattered light by causing light to enter the optical fiber, and acquire the temperature distribution of the optical fiber in the length direction thereof based on the result of the detection. The data processing apparatus is configured to store therein the temperature distribution acquired by the temperature distribution measurement apparatus, perform signal processing on a difference temperature distribution obtained by computing the difference between a current temperature distribution and a past temperature distribution, and determine whether or not abnormality is present based on the result of the signal processing.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: November 14, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Fumio Takei, Takeo Kasajima, Kyoko Tadaki, Minoru Ishinabe
  • Patent number: 9797782
    Abstract: A temperature distribution measurement apparatus includes a laser light source optically connected to an optical fiber, a photodetector configured to detect light backscattered in the optical fiber, and a temperature distribution measurement unit configured to obtain a true measured temperature distribution by performing correction calculation using a transfer function on a temporary measured temperature distribution obtained based on an output from the photodetector. The temperature distribution measurement unit stores therein data on a transfer function set for each entire length of the optical fiber and for each longitudinal position in the optical fiber. Then, when the length of the optical fiber is changed, the temperature distribution measurement unit changes the transfer function to be used in the correction calculation by using the data on the transfer function.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: October 24, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Takeo Kasajima, Kazushi Uno, Minoru Ishinabe, Kyoko Tadaki, Fumio Takei
  • Publication number: 20170097267
    Abstract: A temperature measurement device includes: an optical fiber that is arranged along a predetermined path; a light source configured to input a light into the optical fiber; a measurer configured to measure temperature distribution information in an extension direction of the optical fiber based on a back-scattering light from the optical fiber; and a corrector configured to make a filter for reducing a noise component of temperature distribution information measured by the measurer based on a difference of temperature distribution information between two different regions of the optical fiber in which a common temperature distribution is obtained, and correct the temperature distribution information by applying the filter to the temperature distribution information.
    Type: Application
    Filed: September 21, 2016
    Publication date: April 6, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Takahiro Arioka, Kazushi Uno, Takeo Kasajima, Hiroyuki FUKUDA
  • Patent number: 9528860
    Abstract: An abnormality detection system includes an optical fiber, a backscattered light detection unit, and a data processing unit. The detection unit is connected to one end and the other end of the optical fiber and configured to acquire a first intensity distribution of backscattered light by causing light to enter the optical fiber from the one end, and to acquire a second intensity distribution of backscattered light by causing light to enter the optical fiber from the other end. The processing unit is configured to calculate the product of a value obtained by applying a first FIR filter to the first intensity distribution, and a value obtained by applying a second FIR filter to the second intensity distribution, for each of locations on the optical fiber in the length direction thereof, and to determine whether or not abnormality is present based on the result of the calculation.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: December 27, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Kazushi Uno, Fumio Takei, Takeo Kasajima, Kyoko Tadaki, Minoru Ishinabe