公开(公告)号：US20250146863A1

公开(公告)日：2025-05-08

申请号：US18930454

申请日：2024-10-29

Applicant: NEC Laboratories America, Inc.

Inventor： Jian Fang ,  Wataru Kohno ,  Ting Wang

IPC: G01H9/00

Abstract: Methods and systems for acoustic sensing include determining sensing locations along a fiber to generate a beam pattern that is directed to an acoustic source. An optical pulse is transmitted on the fiber. Optical phase of backscattering light is measured from the sensing locations on the fiber. An output signal is generated by combining the measured optical phase according to the beam pattern.

公开(公告)号：US20250149916A1

公开(公告)日：2025-05-08

申请号：US18938281

申请日：2024-11-06

Applicant: NEC Laboratories America, Inc.

Inventor： Zhuocheng JIANG ,  Yue TIAN ,  Yangmin DING ,  Sarper OZHARAR ,  Yanchao WANG ,  Wataru Kohno ,  Ting Wang

IPC: H02J13/00

Abstract: Disclosed are systems and methods directed to a frequency analysis approach to transformer status monitoring using distributed fiber optic sensing to monitor a phase delay of a 120 Hz vibrational signal and determining an angular difference between a designated point and a reference point. Operationally, systems and methods according to aspects of the present disclosure identify phase delay patterns of a single transformer from its vibrational humming and combined vibrational signals of multiple transformers.