Intracavity multigas detection based on multiband fiber ring laser

Abstract We present a new method for multigas detection based on multiband fiber ring laser. Wavelength division multiplexing is used to realize multiband laser operation. Laser intracavity absorption spectroscopy combined with wavelength modulation technique is used to improve the measurement sensitivity. The second harmonic signal is extracted by the software-based lock-in algorithm for gas concentration retrieval. The relationship between the harmonic amplitudes and gas concentrations is investigated under both weak absorption and strong absorption to improve the accuracy of concentration retrieval. When the system is applied to detect the mixed gases of acetylene, carbon monoxide and carbon dioxide in C + L band, the minimum detectable concentrations are 0.6 ppm, 17.4 ppm and 19.2 ppm respectively.

[1]  Y. Liu,et al.  Simultaneous Measurements of Multiple Parameters at Elevated Temperature Using a Frequency-Division Multiplexing Scheme with Tunable Diode Lasers , 2012, Applied spectroscopy.

[2]  D. Labrie,et al.  Second-harmonic detection with tunable diode lasers — Comparison of experiment and theory , 1981 .

[3]  Gang-Ding Peng,et al.  Theoretical investigation of an optical fiber amplifier loop for intra-cavity and ring-down cavity gas sensing , 2010 .

[4]  W Sibbett,et al.  Derivation of the threshold pump power of erbium-doped fiber lasers. , 1992, Optics letters.

[5]  R. Tatam,et al.  Optical gas sensing: a review , 2012 .

[6]  Clemens F Kaminski,et al.  High bandwidth absorption spectroscopy with a dispersed supercontinuum source. , 2007, Optics express.

[7]  Masataka Nakazawa,et al.  A single-frequency and single-polarization fiber ring laser using a 5-Ghz fiber Bragg grating , 1999 .

[8]  B. Pálsdóttir,et al.  Fiber laser intracavity absorption spectroscopy for in situ multicomponent gas analysis in the atmosphere and combustion environments , 2011 .

[9]  Calibration-free wavelength modulated TDLAS under high absorbance conditions. , 2011, Optics express.

[10]  Gang Li,et al.  The HITRAN 2008 molecular spectroscopic database , 2005 .

[11]  L. Dore.  Using Fast Fourier Transform to compute the line shape of frequency-modulated spectral profiles , 2003 .

[12]  V. Baev,et al.  Laser intracavity absorption spectroscopy , 1999 .

[13]  Jianquan Yao,et al.  Fiber ring laser sensor based on hollow-core photonic crystal fiber , 2015 .

[14]  Lei Zhang,et al.  Development of an intra-cavity gas detection system based on L-band erbium-doped fiber ring laser , 2014 .

[15]  D. Oh,et al.  Frequency Modulation Multiplexing for Simultaneous Detection of Multiple Gases by use of Wavelength Modulation Spectroscopy with Diode Lasers. , 1998, Applied optics.

[16]  W Johnstone,et al.  Intra-Cavity Spectroscopy Using Amplified Spontaneous Emission in Fiber Lasers , 2011, Journal of Lightwave Technology.

[17]  T. F. Morse.  Fiber laser intra-cavity spectroscopy (FLICS) , 1999, International Conference on Optical Fibre Sensors.

[18]  Hui Ding,et al.  A novel fiber Fabry–Perot filter based mixed-gas sensing system , 2009 .

[19]  R. Hanson,et al.  Fitting of calibration-free scanned-wavelength-modulation spectroscopy spectra for determination of gas properties and absorption lineshapes. , 2014, Applied optics.

[20]  Min Zhang,et al.  Sensitivity enhancement in erbium-doped fiber laser intra-cavity absorption sensor , 2003 .

[21]  S. Schilt,et al.  Multi-hydrogenated compounds monitoring in optical fibre manufacturing process by photoacoustic spectroscopy , 2006 .