Remote multipoint fiber optic gas sensors using an FMCW technique and a tunable laser

Hongbo Yu, Hoi Ho, Wei Jin, Yanbiao Liao, Yanhe Li

Research output: Journal article publicationConference articleAcademic researchpeer-review


The cost per sensing point may be reduced by networking a number of gas sensors that shares the same tunable laser and/or the same signal processing electronics. In this paper we report on the use of a frequency modulated continuous wave (FMCW) technique for addressing the remote optical fiber gas sensor arrays. The sensor network is of a ladder topology and is interrogated by a tunable external-cavity semiconductor lasers. The system performance in terms of detection sensitivity and crosstalk between sensors is investigated. By using appropriate wavelength modulation/scanning coupled with low pass filtering, the coherent interferometric noise can be reduced greatly. Computer simulation shows that an array of 20 acetylene (C2H2) gas sensors with 2000ppm (2.5cm gas cell, or 50ppm.m) detection sensitivity for each sensor may be realized. A two-sensor acetylene gas detection system is experimentally demonstrated with detection sensitivity of 165ppm/√Hz (2.5cm gas cell or 4ppm.m/√Hz) and crosstalk of -25dB.

Original languageEnglish
Pages (from-to)44-53
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2000
EventAdvanced Photonic Sensors: Technology and Applications - Beijing, China
Duration: 8 Nov 200010 Nov 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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