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

19 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.
LanguageEnglish
Pages1011-1020
Number of pages9
JournalApplied Optics
Volume40
Issue number7
Publication statusPublished - 1 Mar 2001

Fingerprint

multiplexing
optical fibers
sensors
gases
acetylene
tunable lasers
ladders
continuous radiation
topology
computerized simulation
modulation
scanning
cells
wavelengths

Keywords

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

Cite this

Yu, H. B., Jin, W., Ho, H. L., Chan, K. C., Chan, C. C., Demokan, M. S., ... Liao, Y. B. (2001). Multiplexing of optical fibre gas sensors with an FMCW technique. Applied Optics, 40(7), 1011-1020.
Yu, H.B. ; Jin, W. ; Ho, H.L. ; Chan, K.C. ; Chan, C.C. ; Demokan, M.S. ; Stewart, G. ; Culshaw, B. ; Liao, Y.B. / Multiplexing of optical fibre gas sensors with an FMCW technique. In: Applied Optics. 2001 ; Vol. 40, No. 7. pp. 1011-1020.
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Yu, HB, Jin, W, Ho, HL, Chan, KC, Chan, CC, Demokan, MS, Stewart, G, Culshaw, B & Liao, YB 2001, 'Multiplexing of optical fibre gas sensors with an FMCW technique' Applied Optics, vol. 40, no. 7, pp. 1011-1020.

Multiplexing of optical fibre gas sensors with an FMCW technique. / Yu, H.B.; Jin, W.; Ho, H.L.; Chan, K.C.; Chan, C.C.; Demokan, M.S.; Stewart, G.; Culshaw, B.; Liao, Y.B.

In: Applied Optics, Vol. 40, No. 7, 01.03.2001, p. 1011-1020.

Research output: Contribution to journalArticle

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T1 - Multiplexing of optical fibre gas sensors with an FMCW technique

AU - Yu, H.B.

AU - Jin, W.

AU - Ho, H.L.

AU - Chan, K.C.

AU - Chan, C.C.

AU - Demokan, M.S.

AU - Stewart, G.

AU - Culshaw, B.

AU - Liao, Y.B.

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AB - 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.

KW - fiber optics

KW - optical communication

KW - multiplexing

KW - optical fibre

KW - gas sensors

KW - FMCW technique

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Yu HB, Jin W, Ho HL, Chan KC, Chan CC, Demokan MS et al. Multiplexing of optical fibre gas sensors with an FMCW technique. Applied Optics. 2001 Mar 1;40(7):1011-1020.