Journal
APPLIED SCIENCES-BASEL
Volume 9, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/app9020338
Keywords
tunable laser absorption spectroscopy; mid-infrared fingerprint spectrum; broadband spectrum; trace gas detection; wavelength modulation spectroscopy; quantum cascade lasers; interband cascade lasers
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Funding
- National Natural Science Foundation of China [61505142]
- Tianjin Natural Science Foundation [16JCQNJC02100]
- Science & Technology Development Fund of the Tianjin Education Commission for Higher Education [2017KJ085]
- Natural Science Foundation of Hebei Province [F2014202065]
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The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5-25 mu m), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008-2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.
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