Simultaneous measurement of gas absorption and path length by employing the first harmonic phase angle method in wavelength modulation spectroscopy

doi:10.1364/oe.383744

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	Simultaneous measurement of gas absorption and path length by employing the first harmonic phase angle method in wavelength modulation spectroscopy
	C. G. Yang,L. Mei,X. P. Wang,H. Deng,M. Hu,Z. Y. Xu,B. Chen,Y. B. He and R. F. Kan
	2020
发表期刊	Optics Express
ISSN	1094-4087
卷号	28 期号:3 页码:3289-3297
摘要	Tunable diode laser absorption spectroscopy has been widely employed for gas sensing, where the gas concentration is often obtained from the absorption signal with a known or a fixed absorption path length. Nevertheless, there are also numerous applications in which the absorption path length is very challenging to retrieve, e.g., open path remote sensing and gas absorption in scattering media. In this work, a new approach, based on the wavelength modulation spectroscopy (WMS), has been developed to measure the gas absorption signal and the corresponding absorption path length simultaneously. The phase angle of the first harmonic signal (1f phase angle) in the WMS technique is utilized for retrieving the absorption path length as well as the gas absorption signal. This approach has been experimentally validated by measuring carbon dioxide (CO2) concentration in open path environment. The CO2 concentration is evaluated by measuring the reflectance signal from a distant object with hundreds of meters away from the system. The measurement accuracy of the absorption path length, evaluated from a 7-day continuous measurement, can reach up to 1%. The promising result has shown a great potential of utilizing the 1f phase angle for gas concentration measurements, e.g., open path remote sensing applications. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
DOI	10.1364/oe.383744
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64886
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	C. G. Yang,L. Mei,X. P. Wang,H. Deng,M. Hu,Z. Y. Xu,B. Chen,Y. B. He and R. F. Kan. Simultaneous measurement of gas absorption and path length by employing the first harmonic phase angle method in wavelength modulation spectroscopy[J]. Optics Express,2020,28(3):3289-3297.
APA	C. G. Yang,L. Mei,X. P. Wang,H. Deng,M. Hu,Z. Y. Xu,B. Chen,Y. B. He and R. F. Kan.(2020).Simultaneous measurement of gas absorption and path length by employing the first harmonic phase angle method in wavelength modulation spectroscopy.Optics Express,28(3),3289-3297.
MLA	C. G. Yang,L. Mei,X. P. Wang,H. Deng,M. Hu,Z. Y. Xu,B. Chen,Y. B. He and R. F. Kan."Simultaneous measurement of gas absorption and path length by employing the first harmonic phase angle method in wavelength modulation spectroscopy".Optics Express 28.3(2020):3289-3297.

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