Spectroscopy and Spectral Analysis, Volume. 34, Issue 3, 838(2014)
A Trace Gas Sensor Using Mid-Infrared Quantum Cascaded Laser at 48μm to Detect Carbon Monoxide
Presented in the present paper is a compact instrument developed for rapid, sensitive and continuous monitoring of trace gases in air, with results shown for carbon monoxide concentration. This instrument takes advantage of recent technology in mid-infrared quantum cascaded laser (QCL) operating at 48 μm and mercury cadmium telluride (HgCdTe) mid-infrared (MIR) detector, combing MIR multipass herriott cell with 76 m absorption path length to obtain low detection sensitivity down to 50 nmol·mol-1 level in 4 s acquisition time. Meanwhile, in order to eliminate the instability induced by electrically modulated light source and effectively improve detection limit of the instrument, an optical structure with dual channel path was designed which is based on differential optical absorption spectroscopy method. The experimental results show that the instrument integrated with gas concentration inversion algorithm can be applied to in-situ measurements of trace gases without calibration. Additionally, operator could substitute a QCL operating at a different wavelength to measure other gases.
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CHEN Chen, WANG Biao, LI Chun-guang, LI Jian, WANG Yi-ding. A Trace Gas Sensor Using Mid-Infrared Quantum Cascaded Laser at 48μm to Detect Carbon Monoxide[J]. Spectroscopy and Spectral Analysis, 2014, 34(3): 838
Category: Research Articles
Received: May. 22, 2013
Accepted: --
Published Online: Mar. 14, 2014
The Author Email: Chen CHEN (cchen19831102@gmail.com)