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:
Dec. 18, 2012
Filed:
Nov. 06, 2009
Charles G Askins, Upper Marlboro, MD (US);
Charles G Askins, Upper Marlboro, MD (US);
The United States of America, as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
An apparatus and accompanying method to measure fiber twist. The method includes independent determination of fiber bending by measuring strain sensing in outer cores of the same fiber. The apparatus includes a multi-core optical fiber comprising a center core and a plurality of peripheral cores at a distance radially from the center core and running parallel to the center core. The center core includes at least one fiber Bragg grating with polarization-dependent reflectivity. The fiber Bragg grating reflects the launched light as reflected light. The apparatus includes a multi-core optical fiber bend sensing system operable to communicate with the multi-core optical fiber. The multi-core optical fiber bend sensing system is operable to sense a bend in the multi-core optical fiber. The apparatus includes a processor operable to communicate with the polarization controller. The apparatus includes a polarization vector analyzer operable to communicate electronically with the processor, and optically with a portion of the light launched into the central core of the optical fiber. The polarization vector analyzer is operable to measure the state of polarization of the launched light. The polarization controller is operable to align the polarization of the launched light with the minor axis or the major axis of birefringence of the FBG. The processor is operable, after the polarization controller aligns the polarization of the launched light, to determine a twist in the multi-core optical fiber based on the polarization of the launched light and the bend in the multi-core optical fiber.