Fiber Bragg grating-based wavelength modulation spectroscopy technique for trace gas sensing

Shivani Tiwari; Nilesh J. Vasa; Balaji Srinivasan

doi:10.1117/12.2227749

29 April 2016 Fiber Bragg grating-based wavelength modulation spectroscopy technique for trace gas sensing

Shivani Tiwari, Nilesh J. Vasa, Balaji Srinivasan

Proceedings Volume 9899, Optical Sensing and Detection IV; 98992E (2016) https://doi.org/10.1117/12.2227749
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

A novel gas sensing system based on a tunable fiber Bragg grating (FBG) and a Super luminescent light emitting diode (SLED) source is proposed for trace gas sensing. Such a system has been demonstrated for precise detection of acetylene (C₂H₂) using wavelength modulation spectroscopy technique (WMS) based on modulating the Bragg wavelength of FBG within the width of an absorption line of a target gas. The sensing system has been calibrated against specific gas concentrations (ppm) through controlled experiments and the minimum detectable acetylene (C₂H₂) gas concentration is experimentally found to be ~ 80 ppm (0.008% by volume). Furthermore, the detection limit of the system is estimated to be limited by the noise floor of our system at ~ 7 ppm (0.0007% by volume). The proposed system provides a relatively inexpensive alternative for trace gas sensing based on a well-established FBG technology. Moreover, the proposed system has tremendous potential for simultaneous detection of multiple species through the use of a cascaded set of carefully chosen FBGs.

Citation Download Citation

Shivani Tiwari, Nilesh J. Vasa, and Balaji Srinivasan "Fiber Bragg grating-based wavelength modulation spectroscopy technique for trace gas sensing", Proc. SPIE 9899, Optical Sensing and Detection IV, 98992E (29 April 2016); https://doi.org/10.1117/12.2227749

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