Multiplexing of optical fibre gas sensors with an FMCW technique

H.B. Yu, W. Jin, H.L. Ho, K.C. Chan, C.C. Chan, M.S. Demokan, G. Stewart, B. Culshaw, Y.B. Liao

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We report on the use of a frequency-modulated continuous-wave technique for multiplexing optical fiber gas sensors. The sensor network is of a ladder topology and is interrogated by a tunable laser. The system performance in terms of detection sensitivity and cross talk between sensors was investigated and found to be limited by coherent mixing between signals from different channels. The system performance can be improved significantly by use of appropriate wavelength modulation -scanning coupled with low-pass filtering. Computer simulation shows that an array of 37 acetylene sensors with a detection accuracy of 2000 parts in 106 for each sensor may be realized. A two-sensor acetylene detection system was experimentally demonstrated that had a detection sensitivity of 165 parts in 106 for 2.5-cm gas cells (or a minimum detectable absorbance of 2.1 x 10-4 ) and a cross talk of -25 dB.
Original languageEnglish
Pages (from-to)1011-1020
Number of pages9
JournalApplied Optics
Volume40
Issue number7
Publication statusPublished - 1 Mar 2001

Keywords

  • fiber optics
  • optical communication
  • multiplexing
  • optical fibre
  • gas sensors
  • FMCW technique

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