×

Fiber optic grating-based weighted, two-mode fiber sensors

  • US 5,208,877 A
  • Filed: 08/29/1991
  • Issued: 05/04/1993
  • Est. Priority Date: 08/29/1991
  • Status: Expired due to Fees
First Claim
Patent Images

1. A two-mode, elliptical-core, vibration-modal optical fiber strain sensor with a permanent photo-induced index change forming a grating within the optical fiber characterized by a change in beat-length along the length of the optical fiber which is dependent on the amount of strain induced in the optical fiber while the grating is being formed, said grating being produced by differential phase modulation between LP01 and LP11even modes of laser light propagating in said optical fiber while the fiber is under stress, said optical fiber sensor exhibiting a strain sensitivity which is a function of distance along the length of the optical fiber.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×