Patents by Inventor Kazushi Oishi

Kazushi Oishi 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).

  • Optical fiber temperature distribution measurement device and method of measuring optical fiber temperature distribution
    Patent number: 9689751
    Abstract: An optical fiber temperature distribution measurement device for measuring a temperature distribution along a longitudinal direction of an optical fiber is provided.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: June 27, 2017
    Assignee: Yokogawa Electric Corporation
    Inventors: Hideo Shida, Kazushi Oishi
  • Optical fiber temperature distribution measuring device
    Patent number: 9631983
    Abstract: An optical fiber temperature distribution measuring device measures a temperature distribution along an optical fiber by using backward Raman scattering light generated in the optical fiber. The device includes an arithmetic controller that changes a plurality of calibration parameters in conjunction with each other on the basis of a measured temperature value and a reference temperature value at a to-be-measured point, thereby converging a calibrated value of the measured temperature to a true value.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: April 25, 2017
    Assignee: Yokogawa Electric Corporation
    Inventors: Kazushi Oishi, Teruaki Umeno
  • OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING DEVICE
    Publication number: 20150330844
    Abstract: An optical fiber temperature distribution measuring device measures a temperature distribution along an optical fiber by using backward Raman scattering light generated in the optical fiber. The device includes an arithmetic controller that changes a plurality of calibration parameters in conjunction with each other on the basis of a measured temperature value and a reference temperature value at a to-be-measured point, thereby converging a calibrated value of the measured temperature to a true value.
    Type: Application
    Filed: May 11, 2015
    Publication date: November 19, 2015
    Applicant: YOKOGAWA ELECTRIC CORPORATION
    Inventors: Kazushi OISHI, Teruaki UMENO
  • OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASUREMENT DEVICE AND METHOD OF MEASURING OPTICAL FIBER TEMPERATURE DISTRIBUTION
    Publication number: 20140254629
    Abstract: An optical fiber temperature distribution measurement device for measuring a temperature distribution along a longitudinal direction of an optical fiber is provided.
    Type: Application
    Filed: February 27, 2014
    Publication date: September 11, 2014
    Applicant: YOKOGAWA ELECTRIC CORPORATION
    Inventors: Hideo SHIDA, Kazushi Oishi
  • Optical fiber characteristic measuring device and method
    Patent number: 8724101
    Abstract: An optical fiber characteristic measuring device of the present invention includes: a light source which emits laser light modulated at a predetermined modulation frequency; an incident section which causes the laser light from the light source as continuous light and pulsed light to be incident from one end and other end of an optical fiber respectively; a timing adjuster which causes light emitted from the optical fiber to pass therethrough at a predetermined timing; and a light detector which detects the light which passes through the timing adjuster, and measures a characteristic of the optical fiber by using a detection result of the light detector, and the device includes: a synchronous detector which synchronously detects the detection result of the light detector by using a synchronization signal having a predetermined frequency; and a frequency setter which changes the frequency of the synchronization signal in a case where the modulation frequency at the light source is an integer multiple of the fr
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: May 13, 2014
    Assignees: Mitsubishi Heavy Industries, Ltd., Yokogawa Electric Corporation
    Inventors: Kazuo Hotate, Takashi Yari, Masahito Ishioka, Yoshihiro Kumagai, Kazushi Oishi
  • OPTICAL FIBER CHARACTERISTIC MEASURING DEVICE AND METHOD
    Publication number: 20110032517
    Abstract: An optical fiber characteristic measuring device of the present invention includes: a light source which emits laser light modulated at a predetermined modulation frequency; an incident section which causes the laser light from the light source as continuous light and pulsed light to be incident from one end and other end of an optical fiber respectively; a timing adjuster which causes light emitted from the optical fiber to pass therethrough at a predetermined timing; and a light detector which detects the light which passes through the timing adjuster, and measures a characteristic of the optical fiber by using a detection result of the light detector, and the device includes: a synchronous detector which synchronously detects the detection result of the light detector by using a synchronization signal having a predetermined frequency; and a frequency setter which changes the frequency of the synchronization signal in a case where the modulation frequency at the light source is an integer multiple of the fr
    Type: Application
    Filed: February 20, 2009
    Publication date: February 10, 2011
    Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Kazuo Hotate, Takashi Yari, Masahito Ishioka, Yoshihiro Kumagai, Kazushi Oishi