Remote multipoint fiber optic gas sensors using a FMCW technique and a tunable laser

Hongbo Yu; Hoi Lut Ho; Wei Jin; Yanbiao Liao; Yanhe Li

doi:10.1117/12.401729

3 October 2000 Remote multipoint fiber optic gas sensors using a FMCW technique and a tunable laser

Hongbo Yu, Hoi Lut Ho, Wei Jin, Yanbiao Liao, Yanhe Li

Proceedings Volume 4220, Advanced Photonic Sensors: Technology and Applications; (2000) https://doi.org/10.1117/12.401729
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

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.

Citation Download Citation

Hongbo Yu, Hoi Lut Ho, Wei Jin, Yanbiao Liao, and Yanhe Li "Remote multipoint fiber optic gas sensors using a FMCW technique and a tunable laser", Proc. SPIE 4220, Advanced Photonic Sensors: Technology and Applications, (3 October 2000); https://doi.org/10.1117/12.401729

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