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Multipoint Chemical Gas Sensing Using Frequency-Shifted Interferometry

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3 Author(s)
Fei Ye ; Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada ; Li Qian ; Bing Qi

We apply frequency-shifted interferometry to interrogate multiple gas sensors along a single fiber. This method uses a tunable continuous-wave laser and a slow detector, and allows spectral overlap of sensors. It can be used to quantify the concentrations of single or different gas species at multiple locations. A three-sensor system was used to demonstrate this capability, achieving a minimum detectable acetylene concentration of 230 ppm with a 3-cm gas cell, or equivalently, 6.9 ppmmiddot m. The design considerations in the implementation and the system parameters are also discussed.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 23 )