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Optical fiber for sensors including holes in cladding

  • US 5,627,921 A
  • Filed: 10/14/1994
  • Issued: 05/06/1997
  • Est. Priority Date: 10/14/1993
  • Status: Expired due to Term
First Claim
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1. An optical fiber, in particular for use as a sensor, comprisinga cylindrical core which extends in the longitudinal direction of the fiber and is located centrally in the fiber,a cladding which surrounds the core, is connected to the core and has a substantially cylindrical exterior surface, anda hole located completely in the cladding and extending in the longitudinal direction of the fiber,and a substance which changes its volume for variations of physical parameters characteristic of a region where the fiber is intended to be used,the longitudinal hole being completely or partly filled with the substance.

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