公开(公告)号：US20230412266A1

公开(公告)日：2023-12-21

申请号：US18319457

申请日：2023-05-17

Applicant: NEC Laboratories America, Inc.

Inventor： Christopher WHITE ,  Jian FANG ,  Sarper OZHARAR ,  Ting WANG

IPC: H04B10/071 ,  H04B10/2575

CPC classification number: H04B10/071 ,  H04B11/00 ,  H04B10/25756

Abstract: A method for time synchronization using distributed fiber optic sensing (DFOS) that employs several trusted time beacons that are attached to the DFOS sensing fiber which in turn is connected to the DFOS interrogator. The beacons transmit their signal via two different mediums, (1) wirelessly to sensor nodes in the coverage area, and (2) through vibrations on fiber to the DFOS/DAS system located at a trusted area such as the central office. Wireless broadcast to nearby sensors includes a timestamp and beacon ID. All the sensors in the field use one of the beacons in their vicinity (the one with the strongest signal) as their time reference and send the data back with the corresponding beacon index.

公开(公告)号：US20230358907A1

公开(公告)日：2023-11-09

申请号：US18311874

申请日：2023-05-03

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI ,  Christopher WHITE ,  Ting WANG

IPC: G01V1/22 ,  G01V1/00 ,  G01V1/16

CPC classification number: G01V1/226 ,  G01V1/001 ,  G01V1/168 ,  G01V2210/1425

Abstract: A flexible, rapid deployable perimeter monitoring system and method that employs distributed fiber optic sensing (DFOS) technologies and includes a deployment/operations field vehicle including an interrogator and analyzer/processor. The deployment/operations field vehicle is configured to field deploy a ruggedized fiber optic sensor cable in an arrangement that meets a specific application need, and subsequently interrogate/sense via DFOS any environmental conditions affecting the deployed fiber optic sensor cable. Such sensed conditions include mechanical vibration, acoustic, and temperature that may be advantageously sensed/evaluated/analyzed in the deployment/operations vehicle and subsequently communicated to a central location for further evaluation and/or coordination with other monitoring systems. Upon completion, the field vehicle and DFOS reconfigure a current location or redeployed to another location.