Acta Photonica Sinica, Volume. 41, Issue 6, 678(2012)
Research on the High Resolution Trace Gas Detection Based on the Differencefrequency Midinfrared Spectrometer
Midinfrared spectral region is favorable for high sensitivity trace gas detection. The development and characterization of a compact midinfrared laser spectrometer for high resolution spectroscopic detection of trace gases is reported. Continuouswave midinfrared radiation is generated by differencefrequency mixing of outputs of two commercial narrow linewidth diode lasers. A maximum midinfrared radiation power of 1 μW at 3.31 μm is generated, and the wavelength tuning region is around 3.2 μm to 3.7 μm. The highresolution spectroscopy capability of this spectrometer is evaluated by trace CH4 measurement, the line at 3 028.751 cm-1 of v3 fundamental vibrational band of CH4 is chosen as target analysis line for this line is relatively free of interference by other gas species. The detection sensitivity for CH4 is estimated to be 0.8 ppm for 10 cm optical path length at atmospheric pressure, and the limitation is supposed mainly from the etalon noise of optical surfaces.
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CHEN Dong, ZHANG Bokun, HU Xie, LIU Wenqing, ZHANG Yujun. Research on the High Resolution Trace Gas Detection Based on the Differencefrequency Midinfrared Spectrometer[J]. Acta Photonica Sinica, 2012, 41(6): 678
Received: Dec. 6, 2011
Accepted: --
Published Online: Jun. 19, 2012
The Author Email: Dong CHEN (chd1999@sohu.com)