Design of a novel gas sensor structure based on mid-infrared absorption spectrum

Abstract A new type of light-collecting structure that can greatly improve signal-to-noise ratio for gas test was designed on the basis of mid-infrared absorption spectrum principle. A rotational symmetric ellipsoid reflector was employed to collect the mid-infrared radiation with the light source and detector on two focuses, and Beer–Lambert law was applied to construct related math models. Theoretical analysis showed that this structure could perfectly enhance the gains of signals by 648 times. Experimental analysis of methane gas was carried out by using principle of differential absorption, 3.31 μm mid-infrared absorption wavelength and double PbSe detectors. The detection limit of this system was 50 ppm and the test precision was as high as 3%. Due to the attenuation and imprecise ellipsoid reflector, the experimental gain of differential signal was 220 times.

[1]  David Chapman,et al.  Widely tunable single-mode quantum cascade laser source for mid-infrared spectroscopy , 2007 .

[2]  Philippe Dondon,et al.  Development of a reliable methane detector , 1997 .

[3]  R. Hanson,et al.  Tunable diode-laser absorption measurements of methane at elevated temperatures. , 1996, Applied optics.

[4]  D T Reid,et al.  Mid-infrared methane detection in a photonic bandgap fiber using a broadband optical parametric oscillator. , 2007, Optics express.

[5]  George Stewart,et al.  Fibre optic techniques for remote spectroscopic methane detection—from concept to system realisation , 1998 .

[6]  Markus W. Sigrist,et al.  Mobile laser spectrometer with novel resonant multipass photoacoustic cell for trace-gas sensing , 2000 .

[7]  K. P. Petrov,et al.  Mid-infrared spectroscopic detection of trace gases using guided-wave difference-frequency generation , 1998 .

[8]  J. Stafford-Evans,et al.  Standoff sensing of natural gas leaks: evolution of the remote methane leak detector (RMLD) , 2005, 2005 Quantum Electronics and Laser Science Conference.

[9]  Wei Jin,et al.  Sensitive, multipoint gas detection using TDM and wavelength modulation spectroscopy , 2000 .

[10]  Harold I. Schiff,et al.  Some applications of NIR tunable diodes for remote sensing , 1996 .

[11]  Frank K. Tittel,et al.  Recent Advances in Trace Gas Detection Using Quantum and Interband Cascade Lasers (「レーザー分光による環境微量物質の計測」解説小特集号) , 2006 .

[12]  B. Corbett,et al.  Methane sensing with a novel micromachined single-frequency Fabry-Perot laser diode emitting at 1331 nm , 1997, IEEE Photonics Technology Letters.

[13]  Nicole Jaffrezic-Renault,et al.  Study of a new evanescent wave optical fibre sensor for methane detection based on cryptophane molecules , 2005 .

[14]  A. Cho,et al.  Application of Balanced Detection to Absorption Measurements of Trace Gases with Room-Temperature, Quasi-cw Quantum-Cascade Lasers. , 2001, Applied optics.

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

[16]  H. Inaba,et al.  Remote sensing system for near-infrared differential absorption of CH4 gas using low-loss optical fiber link. , 1984, Applied optics.

[17]  Peter Werle,et al.  Two infrared laser spectrometers for the in situ measurement of stratospheric gas concentration , 2004 .

[18]  Livio Gianfrani,et al.  Trace-gas analysis using diode lasers in the near-IR and long-path techniques , 2002 .

[19]  George Stewart,et al.  New micro-optic cell for optical fibre gas sensors with interferometric noise reduction , 1997 .

[20]  A. Grisel,et al.  A low power integrated catalytic gas sensor , 1993 .

[21]  Tawee Tanbun-Ek,et al.  H2S and CO2 gas sensing using DFB laser diodes emitting at 1.57 μm , 1995 .

[22]  M. Zahniser,et al.  High precision measurements of atmospheric nitrous oxide and methane using thermoelectrically cooled mid-infrared quantum cascade lasers and detectors. , 2004, Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.

[23]  A. Kosterev,et al.  Quantum Cascade Laser based Trace Gas sensor Technology: Recent Advances and Applications , 2007, 2007 IEEE Sensors.