Patents by Inventor Takeo Kasajima

Takeo Kasajima 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: 10325214
    Abstract: An information processing apparatus includes a database configured to store a plurality of physical quantities in time-series, a processor, and a memory storing a program causing the processor to execute acquiring the plurality of physical quantities, selecting first explanatory variates, selecting second explanatory variates, generating past case data by acquiring the physical quantities corresponding to the objective variates and an input variate group of the first explanatory variates and the second explanatory variates, searching for predetermined pieces of past case data in the sequence from the shortest of the inter-vector distances, building up the second model from the input variate group in the predetermined pieces of searched past case data and from the objective variates, and predicting values of objective variates from the second model.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: June 18, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Masatoshi Ogawa, Takeo Kasajima, Hiroshi Endo, Hiroyuki Fukuda, Masao Kondo
  • Patent number: 10316778
    Abstract: An estimation device includes: a memory and a processor, wherein the processor is configured to execute a process including: determining a point of a burning having a higher peak in a predetermined range of a heat release rate based on a peak of a burning having a smaller peak, in a heat release rate waveform in an internal combustion engine that performs a multiple-stage fuel injection; calculating a tangential line of the heat release rate waveform at the point; setting a predetermined point on the tangential line as an initial value for identifying a model parameter of a heat release rate model; identifying the model parameter so that a difference between a calculation value of the heat release rate model and the heat release rate waveform is reduced with use of the initial value; and estimating a heat release rate with a result of an identification of the identifying.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: June 11, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Masatoshi Ogawa, Noriyasu Aso, Hiromitsu Soneda, Takeo Kasajima, Masao Kondo
  • 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
  • Publication number: 20190011319
    Abstract: An engine torque estimating system includes: an engine; a crank angle sensor installed for a crankshaft of an engine; an acquiring circuit for acquiring, from the crank angle sensor, a chronological waveform in which amplitude changes based on a rotational speed of the crankshaft; a generating circuit for generating input data to a mathematical model based on information of the amplitude of the chronological waveform; a calculating circuit for calculating an estimated value of engine torque by giving the generated input data to the mathematical model; and a control circuit for controlling the engine based on the estimated value of engine torque.
    Type: Application
    Filed: September 12, 2018
    Publication date: January 10, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Masatoshi OGAWA, Hiromitsu Soneda, NORIYASU ASO, Takeo Kasajima
  • Patent number: 10138838
    Abstract: An engine torque estimation device includes: a memory; a processor coupled to the memory and the processor configured to, acquire a measured value of a crank angle that is a rotation angle of a crank shaft of an engine, derive, based on the measured value of the crank angle, a calculated value of a crank angle speed, and derive an estimated value of an engine torque, based on a non-linear Kalman filter using a first estimation error that is a difference between the calculated value of the crank angle speed and the estimated value of the crank angle speed.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: November 27, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Masatoshi Ogawa, Hiromitsu Soneda, Noriyasu Aso, Takeo Kasajima
  • Patent number: 10107715
    Abstract: An estimation apparatus, includes: a sensor, disposed in the proximity of a crank rotor, configured to output a signal in response to a positional variation of an outer periphery of the crank rotor, the crank rotor including a plurality of protruding teeth formed at given distances and a tooth-missing region on an outer periphery of the crank rotor and configured to rotate in an interlocking relationship with a crankshaft of an internal combustion engine; and a processor configured to calculate a crank angular velocity of the internal combustion engine at given time intervals from the signal output from the sensor and estimate a first crank angular velocity corresponding to the tooth-missing region from second crank angular velocities at two or more points corresponding to at least one of portions before and after the tooth-missing region.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: October 23, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Hiromitsu Soneda, Masatoshi Ogawa, Takeo Kasajima
  • 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