Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6512
Title: Multiplexing of optical fiber gas sensors with a frequency-modulated continuous-wave technique
Authors: Yu, HB
Jin, W 
Ho, HL
Chan, KC
Chan, CC
Demokan, S
Stewart, G
Culshaw, B
Liao, YB
Keywords: Chemical sensors
Computer simulation
Crosstalk
Frequency modulation
Low pass filters
Multiplexing
Issue Date: 1-Mar-2001
Publisher: Optical Society of America
Source: Applied optics, 1 Mar. 2001, v. 40, no. 7, p. 1011-1020 How to cite?
Journal: Applied optics 
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 × 10⁻⁴) and a cross talk of −25 dB.
URI: http://hdl.handle.net/10397/6512
ISSN: 0003-6935
DOI: 10.1364/AO.40.001011
Rights: © 2001 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-7-1011. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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