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:
Jun. 23, 2020
Filed:
Feb. 24, 2017
Koninklijke Philips N.v., Eindhoven, NL;
Jeroen Jan Lambertus Horikx, Weert, NL;
Gert Wim 'T Hooft, Eindhoven, NL;
Anna Hendrika Van Dusschoten, Eindhoven, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
The present invention relates to a method and system of obtaining a twist rate of a twist applied to an optical fiber () about a longitudinal axis of the optical fiber () at least in a part along a length of the optical fiber, the optical fiber () having a center core () extending along the length of the optical fiber () and at least one outer core () helically wound around the center core () with a spin rate. The method comprises acquiring a twist rate phase signal from an optical measurement of strain along the center core () and the at least one outer core () of the optical fiber (), calculating from the twist rate phase signal a noise filtered version of the twist rate phase signal, calculating from the twist rate phase signal a first order term of the twist rate, which is proportional to one of: i) the twist rate phase signal, ii) the noise filtered version of the twist rate phase signal, and calculating a correction term to the twist rate, which is proportional to one of the following: iii) a product of the twist rate phase signal with the noise filtered version of the twist rate phase signal, iv) a square of the noise filtered version of the twist rate phase signal.