Abstract
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 2000 ppm (2.5 cm gas cell, or 50 ppm.m) detection sensitivity for each sensor may be realized. A two-sensor acetylene gas detection system is experimentally demonstrated with detection sensitivity of 165 ppm/(root)Hz (2.5 cm gas cell or 4 ppm.m/(root) Hz) and crosstalk of -25 dB.
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