公开(公告)号：US11308774B2

公开(公告)日：2022-04-19

申请号：US17124419

申请日：2020-12-16

Applicant: Fiber Sense Pty Ltd

Inventor： Mark A. Englund

IPC: G08B13/186 ,  G01H9/00 ,  H04R23/00

Abstract: Described herein are methods and systems of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system are applied to detect acoustic events near or within the selected geographical area.

公开(公告)号：US20210209908A1

公开(公告)日：2021-07-08

申请号：US17124419

申请日：2020-12-16

Applicant: Fiber Sense Pty Ltd

Inventor： Mark A. ENGLUND

IPC: G08B13/186 ,  G01H9/00 ,  H04R23/00

Abstract: Described herein are methods and systems of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system may be useful in the detection of acoustic events near or within the selected geographical area.

公开(公告)号：US20220018980A1

公开(公告)日：2022-01-20

申请号：US17293422

申请日：2019-11-13

Applicant: FIBER SENSE PTY LTD

Inventor： Mark Andrew ENGLUND

IPC: G01V1/22 ,  G01D5/353

Abstract: Described herein is a method and system for distributed fibre optic sensing in particular across multiple fibre optic ports with multiple corresponding fibre optic paths. In general, the disclosed method and system includes the steps of (a) repeatedly transmitting a train of optical signals through a fibre optic network including a plurality of optical fibres distributed across a geographic area using at least one optical signal transmitter, (b) sequentially distributing optical signals in the train through the plurality of optical fibres via corresponding optical fibre ports using an optical switching arrangement, (c) receiving backscattered optical signals from the plurality of optical fibres, the backscattered optical signals being influenced by disturbances that induce fibre optic sensing signals, including low frequency weight-induced disturbances, (d) demodulating data from the backscattered optical signals, and processing the data to identify at least some of the low-frequency weight-induced disturbances, and/or (e) sensing the backscattered optical signals in a reduced frequency range, thereby reducing the corresponding required sampling rate and increasing the predetermined multiplex or switching ratio or the number of optical fibre ports serviced per optical signal transmitter/receiver. The disclosed method and system may be useful to provide efficient usage of hardware resources. The disclosed method and system may also be useful to detect low frequency weight-induced disturbances for object tracking against high noise clutter in the higher frequency signal bands.

公开(公告)号：US10909822B2

公开(公告)日：2021-02-02

申请号：US16805610

申请日：2020-02-28

Applicant: Fiber Sense Pty Ltd

Inventor： Mark A. Englund

IPC: G08B13/18 ,  G08B13/186 ,  G01H9/00 ,  H04R23/00

Abstract: Described herein are methods and systems of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system are thereby configured to detect acoustic events near or within the selected geographical area.

公开(公告)号：US12235400B2

公开(公告)日：2025-02-25

申请号：US17293422

申请日：2019-11-13

Applicant: FIBER SENSE PTY LTD

Inventor： Mark Andrew Englund

IPC: G01V1/22 ,  G01D5/353

Abstract: This application is directed to distributed fiber optic sensing particularly across multiple fiber optic ports with multiple corresponding fiber optic paths. A method is implemented to repeatedly a train of optical signals through a fiber optic network including a plurality of optical fibers distributed across a geographic area using at least one optical signal transmitter, sequentially distribute optical signals in the train through the plurality of optical fiber via corresponding optical fiber ports using an optical switching arrangement, receive backscattered optical signals from the plurality of optical fibers demodulate data from the backscattered optical signals, process the data to identify at least some of the low-frequency weight-induced disturbances, and/or sense the backscattered optical signals in a reduced frequency range. The method is useful to detect low frequency weight-induced disturbances for object tracking against high noise clutter in the higher frequency signal bands.

公开(公告)号：US10950102B2

公开(公告)日：2021-03-16

申请号：US16805610

申请日：2020-02-28

Applicant: Fiber Sense Pty Ltd

Inventor： Mark A. Englund

IPC: G08B13/18 ,  G08B13/186 ,  G01H9/00 ,  H04R23/00

Abstract: Described herein are methods and systems of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system are thereby configured to detect acoustic events near or within the selected geographical area.