Research on fiber grating sensing characters using fiber cavity ring down demodulation technique

Bo Liu*, Jian Zhang, Jian Hua Luo, Wei Hua Zhang, Qing Shi, Gui Yun Kai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

An exploratory study on the temperature and strain sensor based on weak long period grating (LPG) and fiber ring is presented. This fiber ring-down (FRD) device consists of two matched fiber Bragg gratings, a section of single mode fiber, a weak long period grating, a pulsed laser source and a photodiode. The weak long period grating inserted in fiber ring cavity is used as sensing element which will cause additional loss is cavity. By measuring the fiber ring-down time in time domain, the temperature (0-100°C) and strain (0-l000με) sensing characteristics on weak long period grating are achieved. The demodulation wavelength range is 10 nm.

Original languageEnglish
JournalGuangdianzi Jiguang
Volume18
Issue number9
Publication statusPublished - 1 Sep 2007

Keywords

  • Cavity ring down (CRD)
  • Fiber ring down (FRD)
  • Long period grating (LPG)
  • Sensor

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