Wavelength modulation spectroscopy by employing the first harmonic phase angle method

doi:10.1364/oe.27.012137

CIOMP OpenIR

	Wavelength modulation spectroscopy by employing the first harmonic phase angle method
	C.G.Yang; L.Mei; H.Deng; Z.Y.Xu; B.Chen; R.F.Kan
	2019
发表期刊	Optics Express
ISSN	1094-4087
卷号	27 期号:9 页码:12137-12146
摘要	Wavelength modulation spectroscopy (WMS), widely employed in tunable diode laser absorption spectroscopy (TDLAS), has been accomplished by employing the first harmonic phase angle (1f-PA) method that is immune to the laser intensity and the demodulation phase. The principle of the 1f-PA method has been demonstrated by the phasor decomposition method, which indicates that the 1f-PA is linearly proportional to the integral absorption in the approximation of weak absorption. Validation experiments have been performed to investigate the relationship between the 1f-PA and the modulation amplitude/frequency by measuring the absorption line of CO2 around 6362.5 cm(-1). The peak-to-peak value of the 1f-PA decreases with the increasing of the modulation amplitude, and is particularly apparent under small modulation amplitudes and high modulation frequencies. The 1f-PA shows good linearity with the increasing of the CO2 concentration. Comparing with the traditional first harmonic normalized second harmonic (2f/1f) method, higher detection sensitivities can be achieved at high modulation frequencies. The promising results imply that the 1f-PA method has a great potential in the applications of the WMS technique especially under high modulation frequencies or modulation-amplitude limited conditions, such as strong turbulence or high pressure environments. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
关键词	diode-laser spectroscopy，frequency，recovery，Optics
DOI	10.1364/oe.27.012137
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/181722/62892
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,H.Deng,et al. Wavelength modulation spectroscopy by employing the first harmonic phase angle method[J]. Optics Express,2019,27(9):12137-12146.
APA	C.G.Yang,L.Mei,H.Deng,Z.Y.Xu,B.Chen,&R.F.Kan.(2019).Wavelength modulation spectroscopy by employing the first harmonic phase angle method.Optics Express,27(9),12137-12146.
MLA	C.G.Yang,et al."Wavelength modulation spectroscopy by employing the first harmonic phase angle method".Optics Express 27.9(2019):12137-12146.

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