公开(公告)号：US20240402003A1

公开(公告)日：2024-12-05

申请号：US18668375

申请日：2024-05-20

Applicant: NEC Corporation

Inventor： Noriyuki TONAMI ,  Sakiko MISHIMA ,  Takashi MATSUSHITA ,  Reishi KONDO ,  Tomoyuki HINO

IPC: G01H9/00 ,  G06N20/00 ,  H04R23/00

Abstract: An event recognition apparatus is configured to acquire an observation signal indicating sound or vibration that occurs at a point along an optical fiber and is detected by optical fiber sensing, also acquire a noise signal indicating optical noise present at a point along the optical fiber, and by using statistical information of a sound signal or a vibration signal acquired by a sound sensor or a vibration sensor, derive, from each of the observation signal and the noise signal, a posterior probability that at least one event occurs at a point along the optical fiber, and compare a posterior probability derived from the observation signal with a posterior probability derived from the noise signal, derive, from a result of the comparison, a posterior probability that the at least one event occurs at a point along the optical fiber, and output a result of the derivation.

公开(公告)号：US20240201007A1

公开(公告)日：2024-06-20

申请号：US18066237

申请日：2022-12-14

Applicant: NEC CORPORATION

Inventor： Hemant Shivsagar PRASAD ,  Takashi MATSUSHITA ,  Daisuke IKEFUJI ,  Tomoyuki HINO

IPC: G01H9/00

CPC classification number: G01H9/004

Abstract: A distributed optical fiber sensing (DFOS) system includes a non-transitory computer readable medium configured to store instructions thereon. The DFOS system includes a processor connected to the non-transitory computer readable medium. The processor is configured to receive DFOS data from a sensor connected to an optical fiber, wherein the optical fiber is adjacent a roadway having a bridge. The processor is further configured to filter the DFOS data based on a frequency range. The processor is further configured to generate a plurality of spread features, wherein each spread feature of the plurality of spread features corresponds to a channel of a plurality of channels of the filtered DFOS data. The processor is further configured to perform binarization of the plurality of spread features. The processor is further configured to identify a location of the bridge along the roadway based on results of the binarization of the plurality of spread features.

公开(公告)号：US20240426649A1

公开(公告)日：2024-12-26

申请号：US18741955

申请日：2024-06-13

Applicant: NEC Corporation

Inventor： Noriyuki TONAMI ,  Wataru KOHNO ,  Sakiko MISHIMA ,  Takashi MATSUSHITA ,  Tomoyuki HINO

IPC: G01H9/00 ,  G01D5/353

Abstract: An information processing device includes an acquisition unit that acquires measurement signals measured at a plurality of measurement points on a laid optical fiber cable, a prediction unit that predicts a predictive environment representing the environment of each of the measurement points from each of the measurement signals by using a prediction model set in advance, and a correction unit that corrects the predictive environment on the basis of a comparison between the predictive environment of each of the measurement points and the measurement signal measured at each of the measurement points.

公开(公告)号：US20240184014A1

公开(公告)日：2024-06-06

申请号：US18526798

申请日：2023-12-01

Applicant: NEC Corporation

Inventor： Sakiko MISHIMA ,  Takashi MATSUSHITA ,  Wataru KOHNO ,  Tomoyuki HINO

IPC: G01W1/14 ,  G01D5/353 ,  G01H9/00

CPC classification number: G01W1/14 ,  G01D5/35358 ,  G01H9/004

Abstract: An optical fiber sensing system according to the present disclosure includes an optical fiber, an interrogator connected to the optical fiber, and a vibration device disposed in a vicinity of the optical fiber. The vibration device acquires weather information regarding an installation location of the vibration device, and applies vibration according to the acquired weather information to the optical fiber. The interrogator detects vibration applied to the optical fiber by the vibration device, based on an optical signal received from the optical fiber, and determines weather conditions at the installation location of the vibration device, based on the detected vibration.

公开(公告)号：US20240102851A1

公开(公告)日：2024-03-28

申请号：US18206469

申请日：2023-06-06

Applicant: NEC Corporation

Inventor： Wataru KOHNO ,  Tomoyuki HINO ,  Sakiko MISHIMA ,  Takashi MATSUSHITA

IPC: G01H9/00 ,  H04B10/079

CPC classification number: G01H9/004 ,  H04B10/0791

Abstract: An apparatus includes memory and processor configured to: input, from a sensor, a signal indicating a characteristic vibration occurring at each position of an optical fiber, and estimate, based on the input signal, an aerial section in which the optical fiber being aerially laid over a pole is present; calculate, based on the input signal, sensing data indicating a vibration characteristic of each position of the optical fiber being present in the aerial section, and calculate a difference degree of the sensing data between two neighboring points of the optical fiber; and temporally integrate the difference degree, calculate a time average of the difference degree, estimate, based on a time average value of the difference degree, a position of the pole and a position of an extra length section of the optical fiber, and output an estimation result of positions of the pole and the extra length section.