A Laser-Based Multipass Absorption Sensor for Sub-ppm Detection of Methane, Acetylene and Ammonia

doi:10.3390/s22020556

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	A Laser-Based Multipass Absorption Sensor for Sub-ppm Detection of Methane, Acetylene and Ammonia
	W. Duan; F. W. Yan; Y. Wang; H. Zhang; L. H. Ma; D. X. Wen; W. Wang; G. Sheng and Q. Wang
刊名	Sensors
	2022
卷号	22 期号:2 页码:14
DOI	10.3390/s22020556
英文摘要	A compact, sensitive laser-based absorption sensor for multispecies monitoring of methane (CH4), acetylene (C2H2) and ammonia (NH3) was developed using a compact multipass gas cell. The gas cell is 8.8 cm long and has an effective optical path length of 3.0 m with a sampling volume of 75 mL. The sensor is composed of three fiber-coupled distributed feedback lasers operating near 1512 nm, 1532 nm and 1654 nm, an InGaAs photodetector and a custom-designed software for data acquisition, signal processing and display. The lasers were scanned over the target absorption features at 1 Hz. First-harmonic-normalized wavelength modulation spectroscopy (f = 3 kHz) with the second harmonic detection (WMS-2f/1f) is employed to eliminate the unwanted power fluctuations of the transmitted laser caused by aerosol/particles scattering, absorption and beam-steering. The multispecies sensor has excellent linear responses (R-2 > 0.997) within the gas concentration range of 1-1000 ppm and shows a detection limit of 0.32 ppm for CH4, 0.16 ppm for C2H2 and 0.23 ppm for NH3 at 1 s response time. The Allan-Werle deviation analysis verifies the long-term stability of the sensor, indicating a minimal detection limit of 20-34 ppb were achieved after 60-148 s integration time. Flow test of the portable multispecies sensor is also demonstrated in this work.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/66793]
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. Duan,F. W. Yan,Y. Wang,et al. A Laser-Based Multipass Absorption Sensor for Sub-ppm Detection of Methane, Acetylene and Ammonia[J]. Sensors,2022,22(2):14.
APA	W. Duan.,F. W. Yan.,Y. Wang.,H. Zhang.,L. H. Ma.,...&G. Sheng and Q. Wang.(2022).A Laser-Based Multipass Absorption Sensor for Sub-ppm Detection of Methane, Acetylene and Ammonia.Sensors,22(2),14.
MLA	W. Duan,et al."A Laser-Based Multipass Absorption Sensor for Sub-ppm Detection of Methane, Acetylene and Ammonia".Sensors 22.2(2022):14.