In-fiber bragg grating sensors using interferometric interrogations for passive quadrature signal processing

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Abstract

This letter describes a simple optically passive detection scheme for Bragg grating sensors. This detection scheme is based on two cavity lengths in Fabry-Perot read-out interferometers to produce two quadrature phase shifted signals from the Bragg grating sensor. Using the amplified spontaneous emission from an erbium-doped fiber amplifier as a low-coherence and high-power broad-band source, the passive detection technique is demonstrated by the use of Bragg grating sensors in dynamic strain measurements. This scheme is capable of measuring dynamic strain with a resolution of 0.1 μ∈/√Hz root mean square at a frequency of 500 Hz for 600 μm cavity length in the Fabry-Perot read-out system.

Original languageEnglish
Pages (from-to)1003-1005
Number of pages3
JournalIEEE Photonics Technology Letters
Volume10
Issue number7
DOIs
Publication statusPublished - 1998 Jul

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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