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:
Oct. 12, 2021
Filed:
Dec. 20, 2016
Gravitude As, Bergen, NO;
Remy Agersborg, Straumsgrend, NO;
Bjarte Fagerås, Fana, NO;
Martin Vatshelle, Kalandseidet, NO;
Hugo Ruiz, Nesttun, NO;
Lars Hille, Nesttun, NO;
Trond Espedal, Fyllingsdalen, NO;
John Even Lindgård, Harstad, NO;
Louise Wedderkopp Bjerrum, Bergen, NO;
Yngve Rusås, Laksevåg, NO;
GRAVITUDE AS, Bergen, NO;
Abstract
A system () for monitoring a field () under a body of water, wherein the system () comprises a reference station () and a plurality of permanent seafloor sensors (). Each permanent seafloor sensor () is fixed relative to a seafloor () on or at the field (). The seafloor sensor () further has a nearby survey station () sufficiently distant to ensure that a movable sensor () visiting the nearby survey station () does not disturb measurements from the permanent seafloor sensor (). The distance is sufficiently close to ensure that the offset (Δp, Δg) from a value provided by the permanent seafloor sensor () is constant or can be modelled, e.g. to account for changes in the pressure/depth relation due to changes in water density. Each seafloor sensor is associated with a unique drift function d(t) at least comprising a drift rate (a). Thus, each permanent seafloor () sensor provide an output that is corrected for drift at any time between calibration surveys. The system may be used for permanent monitoring of a seafloor.