Design of a fibre optic multi-point sensor for gas detection

Stewart, George; Tandy, Chris; Moodie, D.G.; Morante, M. A.; Dong, Fengzhong

doi:10.1016/s0925-4005(98)00199-3

Cited by 92 publications

(46 citation statements)

References 7 publications

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“…All these were analyzed in a previous paper for a TDM system. 13 For the FMCW system reported here, the effect of polarization variation and the source noise will be more-or-less the same as that for the TDM system. The shot-noiselimited performance should be better than that of the TDM system because of the relatively high average power level associated with the FMCW system.…”

Section: Theory Of the Frequency-modulated Continuousmentioning

confidence: 94%

“…This would reduce the cost per sensing point and enhance the competitiveness compared with conventional electrical-chemical gas sensors. Spatial division multiplexing 13 ͑SDM͒ and time-division multiplexing 14 ͑TDM͒ techniques have been used for multiplexing fiber optic gas sensors. The SDM system exhibits a performance similar to that of a single-cell system, but a number of receivers and signal processing units need to be used.…”

Section: Introductionmentioning

confidence: 99%

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Multiplexing of optical fiber gas sensors with a frequency-modulated continuous-wave technique

Yu¹,

Jin²,

Ho³

et al. 2001

Appl. Opt.

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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 10 6 for each sensor may be realized. A two-sensor acetylene detection system was experimentally demonstrated that had a detection sensitivity of 165 parts in 10 6 for 2.5-cm gas cells ͑or a minimum detectable absorbance of 2.1 ϫ 10 Ϫ4 ͒ and a cross talk of Ϫ25 dB.

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Section: Theory Of the Frequency-modulated Continuousmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Multiplexing of optical fiber gas sensors with a frequency-modulated continuous-wave technique

Yu¹,

Jin²,

Ho³

et al. 2001

Appl. Opt.

Self Cite

View full text Add to dashboard Cite

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“…Optical gas sensors show great promise in applications of chemical and gas detection with many advantages, such as excellent remote monitoring at long distance, resistance to electromagnetic interference, and safety in flammable and explosive situations. The most important method for the remote monitoring of methane is based on the spectroscopic absorption [4,5]. The proposed method can be realized in many ways, such as a compact hollow waveguides [6], wavelength-division multiplexing [7], and laser diodes [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Method for the Measurement of Methane Gas Based on Multi-beam Interferometry

Ye¹,

Li²

2013

Journal of the Optical Society of Korea

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A method for the measurement of the concentration of methane is experimentally demonstrated. The wavelength filter and gas cell are combined by using one Fabry-Perot etalon, which is filmed with the reflectivity of 96%. The optical broadband source is not only filtered to match the absorption wavelength of methane, but also absorbed by the methane in the same Fabry-Perot etalon. The concentration of the methane can be detected directly by measuring the transmission intensity. Compared with the conventional method, the proposed method possesses low costand high stability.

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“…Stewart et al [19] demonstrated the potential of 2f-WMS-based remote multi-point open-path detection of methane in industrial environments, reporting on various iterations where performance was limited by optical fringes, noise, and system drift [25,26]. Tai et al [21] presented a fiber-coupled continuous-wave 2f-WMS-based system capable of achieving a minimum drift-limited detectable absorbance of 2.0 × 10…”

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confidence: 99%