Fujitsu Corporation

Takahiro Arioka

Hiroyuki Fukuda

Kazushi Uno

Takeo Kasajima

Fumio Takei

Masao Kondo

Hiroshi Endo

Shigeyoshi Umemiya

Hiroaki Yoshida

Masatoshi Ogawa

Kazuaki Karasawa

Shino Tokuyo

Yoshio Kikuchi

Yoichi Takasu

Ayasa So

A computer-readable, non-transitory medium storing a program that causes a computer to execute a process is provided. The process includes acquiring a backward Rayleigh scattered light from an optical fiber composite overhead ground wire of an electrical power transmission facility; generating vibration information of a frequency band including a natural frequency of the optical fiber composite overhead ground wire, on a basis of the backward Rayleigh scattered light; and detecting abnormality of the electrical power transmission facility, on a basis of the vibration information.

Computer-readable non-transitory medium, abnormality detection device and abnormality detection method

A computer-readable, non-transitory medium storing a program that causes a computer to execute a process is provided. The process includes acquiring a backward Rayleigh scattered light from an optical fiber composite overhead ground wire provided along an electrical power transmission line, determining each of spectral densities of each of frequencies of vibration of the optical fiber composite overhead ground wire, on a basis of the backward Rayleigh scattered light, estimating a wind speed of a wind hitting the electrical power transmission line, on a basis of a first spectral density of a first frequency band including a natural frequency of the optical fiber composite overhead ground wire, and estimating a wind direction of the wind, on a basis of a second spectral density of a second frequency band which does not include the natural frequency of the optical fiber composite overhead ground wire.

Computer-readable non-transitory medium, estimation device and estimation method

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.

Determination device, determination method, and non-transitory computer-readable recording medium

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.

Temperature measurement device, temperature measurement method, and computer-readable non-transitory medium

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.

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.

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.

Temperature measuring system and temperature measuring method

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.

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.

Temperature measurement device and temperature measurement method

A modular data center includes: a rack which houses an electronic device; a blower device capable of switching a flowing direction of air and configured to feed the air into the rack; a space housing a moisture absorbent; an in-rack temperature detector which detects a temperature inside the rack; a dew-point temperature detector which detects a dew-point temperature of outside air; and a controller. The controller receives signals inputted from the in-rack temperature detector and the dew-point temperature detector, and controls shutters and the blower device.

Modular data center

A management system includes labels disposed on a management target at respective positions different from each other each of the labels including display parts, the display parts changing respective colors depending on different levels of temperature or humidity, the display parts changing coloring positions depending on the level; an image obtaining unit outputting image data indicating an image of the labels captured by the imaging device; an image processing part performing first or second image processing, the first image processing transforming the image data so that a difference in a number of pixels corresponding to each of the labels among the labels in image data after the transformation is less than that before the transformation, the second image processing recognizing an image of the display parts; and a level detector detecting the level of temperature or humidity based on brightness information of pixels corresponding to the display parts.

Management system

A module-type data center includes: a casing including a first intake opening, a second intake opening, and an exhaust opening; an air conditioner provided in the casing and configured to generate a first airflow by taking in outside air through the first intake opening and bringing the outside air into direct contact with a refrigerant; a fan unit provided in the casing and configured to generate a second airflow by taking in the outside air through the second intake opening; and an electronic device provided in the casing and configured to be air-cooled by a mixed airflow of the first airflow and the second airflow and release an exhaust airflow after the air-cooling to the exhaust opening. The first intake opening and the second intake opening are provided on different surfaces of the casing.

Growing community of inventors

Isehara, Japan

Takahiro Arioka