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Fiber shape sensing systems and methods

  • US 8,780,339 B2
  • Filed: 07/15/2010
  • Issued: 07/15/2014
  • Est. Priority Date: 07/15/2009
  • Status: Active Grant
First Claim
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1. A shape measuring system comprising:

  • a large core optical fiber wherein a fiber grating is written onto said optical fiber; and

    a spectral read out system configured to measure a property of a reflection of light from the fiber grating,wherein the optical fiber includes a fiber core and a fiber cladding, and wherein a separation between outer opposite edges of the diameter of the fiber core is configured such that when the optical fiber is bent, a strain difference exists between the outer opposite edges across the fiber core, and wherein the strain difference in the optical fiber is used to determine bend and/or twisting measurements of the optical fiber.

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