A robust optical sensor for remote multi-species detection combining frequency-division multiplexing and normalized wavelength modulation spectroscopy

doi:10.3390/s21041073

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	A robust optical sensor for remote multi-species detection combining frequency-division multiplexing and normalized wavelength modulation spectroscopy
	W. Jin; H. Zhang; M. Hu; M. Hu; Y. Wei; J. Liang; R. Kan and Q. Wang
	2021
发表期刊	Sensors (Switzerland)
ISSN	14248220
卷号	21 期号:4 页码:1-13
摘要	By combining frequency-division multiplexing and normalized wavelength modulation spectroscopy, a robust remote multi-species sensor was developed and demonstrated for practical hydrocarbon monitoring. Independently modulated laser beams are combined to simultaneously interrogate different gas samples using an open-ended centimeter-size multipass cell. Gas species of interest are demodulated with the second harmonics to enhance sensitivity, and high immunity to laser power variation is achieved by normalizing to the corresponding first harmonics. Performance of the optical sensor was experimentally evaluated using methane (CH4) and acetylene (C2H2) samples, which were separated by a 3-km fiber cable from the laser source. Sub-ppm sensitivity with 1-s time resolution was achieved for both gas species. Moreover, even with large laser intensity fluctuations ranging from 0 to 6 dB, the noise can be kept within 1.38 times as much as that of a stable intensity case. The reported spectroscopic technique would provide a promising optical sensor for remote monitoring of multi hazardous gases with high robustness. 2021 by the authors. Licensee MDPI, Basel, Switzerland.
DOI	10.3390/s21041073
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收录类别	SCI ; EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65606
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	W. Jin,H. Zhang,M. Hu,et al. A robust optical sensor for remote multi-species detection combining frequency-division multiplexing and normalized wavelength modulation spectroscopy[J]. Sensors (Switzerland),2021,21(4):1-13.
APA	W. Jin.,H. Zhang.,M. Hu.,M. Hu.,Y. Wei.,...&R. Kan and Q. Wang.(2021).A robust optical sensor for remote multi-species detection combining frequency-division multiplexing and normalized wavelength modulation spectroscopy.Sensors (Switzerland),21(4),1-13.
MLA	W. Jin,et al."A robust optical sensor for remote multi-species detection combining frequency-division multiplexing and normalized wavelength modulation spectroscopy".Sensors (Switzerland) 21.4(2021):1-13.

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