The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2021
Filed:
May. 31, 2018
Optasense Holdings Limited, Farnborough, GB;
Alastair Godfrey, Farnborough, GB;
OPTASENSE HOLDINGS LIMITED, Hampshire, GB;
Abstract
This application relates to methods and apparatus for distributed fibre optic sensing that can provide an indication of the absolute value of pressure acting on a sensing portion of a fibre optic cable. A sensor apparatus () has a first fibre optic cable structure () comprising a first optical fibre () and an interrogator () configured to perform distributed acoustic sensing on the first optical fibre () to provide a measurement signal from at least one sensing portion of the first optical fibre. The first fibre optic cable structure () is configured such that a sensitivity of a sensing portion () to an incident pressure stimulus (ΔP, ΔP) depends on the ambient pressure (AP, AP) at the location of the respective sensing portion. A processor () is configured to process the measurement signal in response to an incident pressure stimulus (ΔP, ΔP) based on a predetermined sensitivity profile () to determine an indication of the ambient pressure at the respective sensing portion.