Nec Corporation

Yukihide Yoda

Yoshiaki Aono

Koji Asahi

Naoto Ogura

Koyo Mori

Tadayuki Iwano

A specifying system according to the present disclosure includes an optical fiber () laid along a levee () of a river (), a communication unit () configured to receive, from the optical fiber (), an optical signal containing a pattern that changes according to a state of the levee (), and a specifying unit () configured to specify a water level of the river () based on the pattern that changes according to the state of the levee ().

Specifying system, specifying apparatus, and specifying method

In order to provide a detection device that is capable of detecting the submersion of a fiber-optic cable in water before water penetrates the interior of the fiber-optic cable, a detection systemcomprises: a vibration-detecting fiber-optic cable; a receiving meansthat receives an optical signal including vibrations detected by the fiber-optic cable; and a detection meansthat detects submersion of the fiber-optic cable in water on the basis of the vibrations included in the optical signal.

Detection system, detection device, and detection method

An optical fiber sensing system and method assessing that an abnormality has occurred when a vibration pattern of an optical signal output from an optical fiber, that detects a vibration, is not already known. When the vibration pattern of the optical signal has not occurred in accordance with a predetermined event, and the vibration pattern is an abnormal vibration pattern, assessing that the abnormality has occurred at a position at which the optical fiber detected the vibration.

Abnormality assessment device using optical fiber sensing system

A monitoring system according to the present disclosure includes an optical fiber () laid in a monitoring area; an authenticating unit () configured to authenticate a person or a vehicle passing through a gate (G) for entering the monitoring area; an optical fiber sensing unit () configured to acquire, based on an optical signal received from the optical fiber (), a parameter having a unique pattern corresponding to the pattern of action of the authenticated person or vehicle; and an analyzing unit () configured to identify the pattern of action of the authenticated person or vehicle based on the unique pattern of the parameter.

Monitoring system, monitoring device, monitoring method, and non-transitory computer-readable medium

An optical fiber sensing system according to the present disclosure comprises: an optical fiber () that is laid in a pipe (); a reception unit () configured to receive, from the optical fiber (), an optical signal superimposed with vibration detected by the optical fiber (); and an assessment unit () configured to extract a vibration pattern of the vibration detected by the optical fiber () from the optical signal and determine the degradation state of the pipe () based on the extracted vibration pattern.

Optical fiber sensing system, optical fiber sensing device, and method for detecting pipe deterioration

A monitoring system according to the present disclosure includes an optical fiber () laid on a ground or a seabed, an optical fiber sensing unit () configured to receive an optical signal from the optical fiber () and detect a vibration produced in the ground or the seabed based on the optical signal, and an analyzing unit () configured to identify a natural phenomenon that has caused the detected vibration based on a unique pattern of the detected vibration.

A utility pole deterioration detection system includes a cable () disposed in a utility pole (), the cable () containing a communication optical fiber, a receiving unit () configured to receive an optical signal containing a pattern that changes according to a deterioration state of the utility pole () from at least one optical fiber contained in the cable (), and a detection unit () configured to detect a deterioration state of the utility pole () based on the pattern.

Utility pole deterioration detection system, utility pole deterioration detection apparatus, utility pole deterioration detection method, and non-transitory computer readable medium

A utility pole location specifying system according to the present disclosure includes a cable () containing a communication optical fiber disposed in a utility pole (), a receiving unit () configured to receive an optical signal containing a characteristic pattern of the utility pole () from at least one communication optical fiber contained in the cable (), and a specifying unit () configured to specify a location of the utility pole () based on the characteristic pattern.

Utility pole location specifying system, utility pole location specifying apparatus, utility pole location specifying method, and non-transitory computer readable medium

A state specifying system according to the present disclosure includes a cable () disposed in a utility pole (), the cable () containing a communication optical fiber, a receiving unit () configured to receive an optical signal from at least one optical fiber contained in the cable (), and a specifying unit () configured to specify a state of the utility pole () or an environmental state around the utility pole () corresponding to a pattern of the optical signal received by the receiving unit ().

State specifying system, state specifying apparatus, state specifying method, and non-transitory computer readable medium

A method of detecting removal of a maintenance hatch includes transmitting an optical pulse along an optical fiber, wherein a first portion of the optical fiber is proximate to the maintenance hatch. The method further includes detecting backscatter light from the optical fiber using a sensor. The method further includes determining information related to the first portion of the optical fiber based on a comparison of the detected backscatter light and a trained model. The method further includes identifying whether the maintenance hatch has been removed based on the determined information.

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Tokyo, Japan

Yukihide Yoda