Abstract
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 ppm$\cdot$m. The design considerations in the implementation and the system
parameters are also discussed.
© 2009 IEEE
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