Patents Assigned to YOKOGAWA TEST & MEASUREMENT CORPORATION
  • Publication number: 20220021184
    Abstract: A light source device includes a semiconductor laser that has a first end surface and a second end surface parallel to each other and forming a first resonator, and an optical system that is disposed on an optical path of laser light emitted from the semiconductor laser, that forms a second resonator with the second end surface of the semiconductor laser, and that has a reflection characteristic in which a reflectance with respect to light having a previously specified wavelength width centered at a specified center wavelength of the semiconductor laser is higher than the reflectance of the first end surface.
    Type: Application
    Filed: July 8, 2021
    Publication date: January 20, 2022
    Applicants: YOKOGAWA ELECTRIC CORPORATION, YOKOGAWA TEST & MEASUREMENT CORPORATION
    Inventors: Katsushi Ota, Tsukasa Kokubo
  • Patent number: 11175458
    Abstract: A multi-fiber connector fiber-optic measurement device identifies a polarity type and measures an optical power of a multi-fiber connector fiber-optic patch cord. The device includes: a beam splitter that splits light from the multi-fiber connector fiber-optic patch cord into a plurality of lights; a first optical sensor that receives one of the lights split by the beam splitter and outputs a first signal according to the received light; a second optical sensor that receives another of the lights split by the beam splitter and outputs a second signal according to the received light; and a signal processor that calculates the optical power based on the first signal and identifies the polarity type based on the second signal.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: November 16, 2021
    Assignees: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Katsushi Ota, Toshikazu Yamamoto
  • Patent number: 11108461
    Abstract: A method of testing a ribbon fiber cable is provided. The ribbon fiber cable includes optical fibers between a first end face and a second end face. End faces of the optical fibers are lined up in a single line in a line direction. The method includes: injecting light into each optical fiber at the second end face; measuring first power of the light exiting from each optical fiber at the first end face; disposing a member between the first end face and an optical sensor; injecting light into each optical fiber at the second end face; measuring second power of the light exiting from each optical fiber at the first end face; calculating a ratio of the second power to the first power; and testing an array of the optical fibers based on the ratio. Light transmittance of the member monotonically varies in the line direction.
    Type: Grant
    Filed: June 2, 2020
    Date of Patent: August 31, 2021
    Assignees: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Akira Tanigawa, Toshikazu Yamamoto
  • Patent number: 11022512
    Abstract: A measurement system (20) includes pressure measurement apparatuses (220, 221, 222) capable of measuring pressure. The pressure measurement apparatuses (220, 221, 222) measure pressure at a measurement timing designated by a trigger signal.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: June 1, 2021
    Assignees: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Hirokazu Nagashima, Tadahiko Iinuma, Hironori Kurihara, Hideki Yamada
  • Patent number: 10983004
    Abstract: A spectrum correction device includes an analyzer configured to analyze a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum, a corrector configured to perform a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer, and a synthesizer configured to synthesize the spectrum data corrected by the corrector.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: April 20, 2021
    Assignees: Yokogawa Electric Corporation, YOKOGAWA TEST & MEASUREMENT CORPORATION
    Inventors: Gentaro Ishihara, Manabu Kojima
  • Patent number: 10962572
    Abstract: An isolated voltage probe includes: a conductor including a positive lead, a negative lead, and a resistance via which the positive lead and the negative lead are connected to each other; a magnetic sensor for measuring a magnetic field in a non-contact manner, the magnetic field being generated by a current flowing through the conductor; and a coaxial cable for transmitting a signal that is based on an output supplied from the magnetic sensor.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: March 30, 2021
    Assignees: Yokogawa Electric Corporation, YOKOGAWA TEST & MEASUREMENT CORPORATION
    Inventor: Katsuki Mitsunaga
  • Publication number: 20210028858
    Abstract: A method of testing a ribbon fiber cable is provided. The ribbon fiber cable includes optical fibers between a first end face and a second end face. End faces of the optical fibers are lined up in a single line in a line direction. The method includes: injecting light into each optical fiber at the second end face; measuring first power of the light exiting from each optical fiber at the first end face; disposing a member between the first end face and an optical sensor; injecting light into each optical fiber at the second end face; measuring second power of the light exiting from each optical fiber at the first end face; calculating a ratio of the second power to the first power; and testing an array of the optical fibers based on the ratio. Light transmittance of the member monotonically varies in the line direction.
    Type: Application
    Filed: June 2, 2020
    Publication date: January 28, 2021
    Applicants: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Akira Tanigawa, Toshikazu Yamamoto
  • Publication number: 20200379177
    Abstract: A multi-fiber connector fiber-optic measurement device identifies a polarity type and measures an optical power of a multi-fiber connector fiber-optic patch cord. The device includes: a beam splitter that splits light from the multi-fiber connector fiber-optic patch cord into a plurality of lights; a first optical sensor that receives one of the lights split by the beam splitter and outputs a first signal according to the received light; a second optical sensor that receives another of the lights split by the beam splitter and outputs a second signal according to the received light; and a signal processor that calculates the optical power based on the first signal and identifies the polarity type based on the second signal.
    Type: Application
    Filed: May 28, 2020
    Publication date: December 3, 2020
    Applicants: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Katsushi Ota, Toshikazu Yamamoto
  • Patent number: 10782321
    Abstract: An excitation core includes an annular strip-shaped magnetic substance, in which both ends of the strip-shaped magnetic substance are overlapped in a thickness direction and are in contact with one another. A sensor head includes: this excitation core and a magnetism collecting body. The magnetism collecting body includes a strip-shaped first magnetism collector and a strip-shaped second magnetism collector, the first magnetism collector having both ends thereof in contact with both ends of the second magnetism collector to form the annular magnetism collecting body, the magnetism collecting body being disposed on an inside or an outside of the reinforcing body.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: September 22, 2020
    Assignees: Yokogawa Electric Corporation, YOKOGAWA TEST & MEASUREMENT CORPORATION
    Inventors: Takanobu Shinagawa, Kiyoshi Yokoshima
  • Patent number: 10754990
    Abstract: A measurement device is provided. The measurement device includes a display, a detector, an operation unit, and a central processing unit. The detector detects a physical quantity and outputs measurement data based on the detected physical quantity. The operation unit includes plural keys for performing operation functions for operating the measurement device to detect and output the measurement data. The central processing unit controls the display to display the measurement data on the display, and to lock the operation unit such that all of the operation functions are temporarily inoperable except for an unlocking function and one or more of the operation functions that is set to be selectively operable even when the operation unit is locked.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: August 25, 2020
    Assignees: Yokogawa Electric Corporation, YOKOGAWA TEST & MEASUREMENT CORPORATION
    Inventors: Gentaro Ishihara, Tohru Mori
  • Patent number: 10663347
    Abstract: An optical measurement apparatus includes: a moving mirror that changes an optical path length of one of two beams generated by splitting light subject to measurement; a drive mechanism that causes the moving mirror to reciprocate a predetermined distance in linear motion; a measured light receiver that detects intensity of light generated by superimposing the two beams; and a computation processor that sets a plurality of measurement ranges within the predetermined distance and calculates a measurement value based on a change in the light intensity detected by the measured light receiver for each of the measurement ranges.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: May 26, 2020
    Assignees: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventor: Manabu Kojima
  • Patent number: 10627291
    Abstract: An optical measurement apparatus includes: a moving mirror that changes an optical path length of one of two beams generated by splitting light subject to measurement; a drive mechanism that causes the moving mirror to reciprocate a predetermined distance in linear motion; a measured light receiver that detects intensity of light generated by superimposing the two beams; and a computation processor that sets a plurality of measurement ranges within the predetermined distance and calculates a measurement value based on a change in the light intensity detected by the measured light receiver for each of the measurement ranges.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: April 21, 2020
    Assignees: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventor: Manabu Kojima
  • Patent number: 10620074
    Abstract: A pressure gauge includes: a pressure sensor; a display unit configured to display a measurement value of the pressure sensor; and a measurement controller configured to set, as a measurement range of the pressure sensor, any of a plurality of measurement ranges defined by a lower limit value specific to the pressure sensor and respective upper limit values that are equal to or lower than an upper limit value specific to the pressure sensor and are different from each other, and to avoid that the display unit displays the measurement value when the measurement value exceeds a display upper limit value dependent on the upper limit value of the measurement range that is set.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: April 14, 2020
    Assignees: Yokogawa Electric Corporation, Yokogawa Test & Measurement Corporation
    Inventors: Hirokazu Nagashima, Tadahiko Iinuma, Toshiaki Kawakami
  • Publication number: 20190346325
    Abstract: A measurement system (20) includes pressure measurement apparatuses (220, 221, 222) capable of measuring pressure. The pressure measurement apparatuses (220, 221, 222) measure pressure at a measurement timing designated by a trigger signal.
    Type: Application
    Filed: May 13, 2019
    Publication date: November 14, 2019
    Applicants: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Hirokazu NAGASHIMA, Tadahiko IINUMA, Hironori KURIHARA, Hideki YAMADA
  • Publication number: 20190323887
    Abstract: A spectrum correction device includes an analyzer configured to analyze a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum, a corrector configured to perform a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer, and a synthesizer configured to synthesize the spectrum data corrected by the corrector.
    Type: Application
    Filed: April 15, 2019
    Publication date: October 24, 2019
    Applicants: Yokogawa Electric Corporation, Yokogawa Test & Measurement Corporation
    Inventors: Gentaro ISHIHARA, Manabu KOJIMA
  • Patent number: 10345341
    Abstract: An excitation core includes a first strip-shaped magnetic substance and a second strip-shaped magnetic substance. The first strip-shaped magnetic substance has both ends mutually overlapped with and mutually in contact with both ends of the second strip-shaped magnetic substance in a thickness direction. A sensor head includes this excitation core and a magnetism collecting body. This magnetism collecting body includes strip-shaped first magnetism collector and second magnetism collector. Both ends of the first magnetism collector and both ends of the second magnetism collector are in contact with one another to form the annular magnetism collecting body. This magnetism collecting body is disposed at an inside or an outside of the reinforcing body.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: July 9, 2019
    Assignees: Yokogawa Electric Corporation, Yokogawa Test & Measurement Corporation
    Inventors: Takanobu Shinagawa, Kiyoshi Yokoshima
  • Publication number: 20190120692
    Abstract: An optical measurement apparatus includes: a moving mirror that changes an optical path length of one of two beams generated by splitting light subject to measurement; a drive mechanism that causes the moving mirror to reciprocate a predetermined distance in linear motion; a measured light receiver that detects intensity of light generated by superimposing the two beams; and a computation processor that sets a plurality of measurement ranges within the predetermined distance and calculates a measurement value based on a change in the light intensity detected by the measured light receiver for each of the measurement ranges.
    Type: Application
    Filed: October 25, 2018
    Publication date: April 25, 2019
    Applicants: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventor: Manabu Kojima
  • Publication number: 20180284161
    Abstract: An excitation core includes an annular strip-shaped magnetic substance, in which both ends of the strip-shaped magnetic substance are overlapped in a thickness direction and are in contact with one another. A sensor head includes: this excitation core and a magnetism collecting body. The magnetism collecting body includes a strip-shaped first magnetism collector and a strip-shaped second magnetism collector, the first magnetism collector having both ends thereof in contact with both ends of the second magnetism collector to form the annular magnetism collecting body, the magnetism collecting body being disposed on an inside or an outside of the reinforcing body.
    Type: Application
    Filed: March 16, 2018
    Publication date: October 4, 2018
    Applicants: YOKOGAWA ELECTRIC CORPORATION, Yokogawa Test & Measurement Corporation
    Inventors: Takanobu SHINAGAWA, Kiyoshi YOKOSHIMA
  • Patent number: D890795
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: July 21, 2020
    Assignees: Yokogawa Electric Corporation, Yokogawa Test & Measurement Corporation
    Inventors: Ayako Kouno, Hisayo Ishikawa, Kouji Hayashi
  • Patent number: D890796
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: July 21, 2020
    Assignees: Yokogawa Electric Corporation, Yokogawa Test & Measurement Corporation
    Inventors: Ayako Kouno, Hisayo Ishikawa, Kouji Hayashi