公开(公告)号：WO1981000618A1

公开(公告)日：1981-03-05

申请号：PCT/US1980001060

申请日：1980-08-15

Applicant: UNITED TECHN CORP

Inventor： UNITED TECHN CORP ,  SNITZER E ,  MELTZ G

IPC: G01L01/24

CPC classification number: G01L1/243 ,  G01B11/18 ,  G01L11/025

Abstract: An optical fiber (10) having at least two cores (12 & 14) positioned in a common cladding (16) can be fabricated to be responsive to strain or hydrostatic pressure (20) but not to temperature through the selection of materials, spacing and shape of the cores and cladding in the fiber. Accordingly, the cross-talk between adjacent cores (12 & 14) in the optical wave-guide (10) can be optimized to respond to a change in hydrostatic pressure (20) or in unidirectional strain along the length of the fiber. The strain or pressure change, can be determined by measuring (22 & 24) the relative intensity of light emerging from the different cores of the fiber. A larger unambiguous range for strain or hydrostatic pressure (20) changes can be provided by a multi-core optical fiber embodiment.