Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 124, Issue 3, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-018-6916-y
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Funding
- National Natural Science Foundation of China [61627823, 61775079]
- National Key R&D Program of China [2017YFB0402800, 2016YFD0700101, 2016YFC0303902]
- Key Science and Technology R&D program of Jilin Province, China [20180201046GX]
- Industrial Innovation Program of Jilin Province, China [2017C027]
- National Science Foundation (NSF) ERC MIRTHE award
- Robert Welch Foundation [R4925U]
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A parts-per-billion in volume (ppbv) level mid-infrared methane (CH4) sensor system was demonstrated using second-harmonic wavelength modulation spectroscopy (2f-WMS). A 3291 nm interband cascade laser (ICL) and a multi-pass gas cell (MPGC) with a 16 m optical path length were adopted in the reported sensor system. Two digital lock-in amplifier (DLIA) schemes, a digital signal processor (DSP)-based DLIA and a LabVIEW-based DLIA, were used for harmonic signal extraction. A limit of detection (LoD) of similar to 13.07 ppbv with an averaging time of 2 s was achieved using the DSP-based DLIA and a LoD of similar to 5.84 ppbv was obtained using the LabVIEW-based DLIA with the same averaging time. A rise time of 0 -> 2 parts-per-million in volume (ppmv) and fall time of 2 -> 0 ppmv were observed. Outdoor atmospheric CH4 concentration measurements were carried out to evaluate the sensor performance using the two DLIA schemes.
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