Patents Assigned to Fiber Sense Limited
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Patent number: 11874417Abstract: The present invention relates to a system for distributed acoustic sensing in a marine environment surrounding a repeater along a fibre-optic submarine communications cable. The system includes at least one distributed acoustic sensing (DAS) unit. Each DAS unit further includes a light source that is configured to transmit outgoing light in at least one fibre-optic sensing cable that is located in the marine environment and a receiver configured to receive reflected light that includes at least one optical property influenced by an acoustic disturbance in the marine environment. Each DAS unit further includes an optical multiplexer for multiplexing optical signals onto the fibre-optic submarine communications cable via the repeater where the optical signals carry information on the at least influenced optical property. A method for distributed acoustic sensing in the marine environment is also disclosed.Type: GrantFiled: July 18, 2018Date of Patent: January 16, 2024Assignee: Fiber Sense LimitedInventor: Mark Andrew Englund
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Patent number: 11867539Abstract: An acoustic system and method is disclosed for providing spatial and temporal classification of a range of different types of sound producing targets in a geographical area. The system includes an optical signal transmitter arrangement for repeatedly transmitting, at multiple instants, interrogating optical signals into each of one or more optical fibres distributed across the geographical area and forming at least part of an installed fibre-optic communications network. An optical signal detector arrangement receives, during an observation period following each of the multiple instants, returning optical signals scattered in a distributed manner over distance along the one or more of optical fibres.Type: GrantFiled: January 10, 2023Date of Patent: January 9, 2024Assignee: Fiber Sense LimitedInventor: Mark A. Englund
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Publication number: 20230421255Abstract: A distributed fiber sensing system may use an integrated coherent receiver. The integrated coherent receiver may include a planar lightwave circuit including various optical components.Type: ApplicationFiled: January 9, 2023Publication date: December 28, 2023Applicant: Fiber Sense LimitedInventor: Gideon Yoffe
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Patent number: 11855416Abstract: A laser for a distributed fiber sensing system may have a frequency discriminator integrated with the laser. The laser may be an external cavity laser, with at least a portion of the laser cavity on a planar lightwave circuit, which also includes the frequency discriminator.Type: GrantFiled: April 28, 2021Date of Patent: December 26, 2023Assignee: Fiber Sense LimitedInventor: Gideon Yoffe
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Patent number: 11721184Abstract: 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.Type: GrantFiled: April 18, 2022Date of Patent: August 8, 2023Assignee: Fiber Sense LimitedInventor: Mark A. Englund
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Patent number: 11555717Abstract: An acoustic system and method is disclosed for providing spatial and temporal classification of a range of different types of sound producing targets in a geographical area. The system includes an optical signal transmitter arrangement for repeatedly transmitting, at multiple instants, interrogating optical signals into each of one or more optical fibres distributed across the geographical area and forming at least part of an installed fibre-optic communications network. An optical signal detector arrangement receives, during an observation period following each of the multiple instants, returning optical signals scattered in a distributed manner over distance along the one or more of optical fibres.Type: GrantFiled: November 10, 2017Date of Patent: January 17, 2023Assignee: Fiber Sense LimitedInventor: Mark Andrew Englund
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Patent number: 11552702Abstract: A distributed fiber sensing system may use an integrated coherent receiver. The integrated coherent receiver may include a planar lightwave circuit including various optical components.Type: GrantFiled: April 28, 2021Date of Patent: January 10, 2023Assignee: Fiber Sense LimitedInventor: Gideon Yoffe
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Patent number: 11308774Abstract: 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.Type: GrantFiled: December 16, 2020Date of Patent: April 19, 2022Assignee: Fiber Sense LimitedInventor: Mark A. Englund