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Abstract

Direct absorption spectrum (DAS) can be used to measure the molecular absorptivity function and determine the spectral parameters of the gas by fitting the measured absorptivity function. Wavelength modulation-direct absorption spectroscopy (WM-DAS) is based on DAS and combines with the idea of harmonic analysis in wavelength modulation spectrum (WMS). The measurement accuracy of absorptivity function can be effectively improved by using Fourier transform. In this paper, the absorptivity function of CO R5–R11 near infrared weak absorption line at 1567 nm is accurately reproduced by using the WM-DAS method combined with long optical path gas absorption cell at room temperature and low pressure. The standard deviation of the fitting residual reaches 3 × 10 ^–5, and then the spectral parameters such as collision broadening, Dicke narrowing and speed-dependent collision broadening coefficients are measured in high precision. These parameters are compared with the results from the high sensitivity continuous wave cavity ring down spectroscopy (CW-CRDS). The experimental results show that the signal-to-noise ratio of the absorptivity function measured by CW-CRDS is about 2.5 times that of the long-path WM-DAS, and the measured spectral parameters are highly consistent. The relative errors of the collision broadening coefficients obtained by using the Voigt profiles of the two methods are less than 1%. At the same time, the detection limit of CO at 1567 nm based on the WM-DAS method is about 80 ppb, and the corresponding absorption coefficient is 2 × 10 ^–10cm ^–1, which is slightly higher than that from the CW-CRDS method. However, the WM-DAS method has the advantages of fast measurement speed, simple system and low cost, and is expected to provide a new method of measuring the weak absorption lines.

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Authors and contacts

Corresponding author:Peng Zhi-Min,apspect@tsinghua.edu.cn

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v₀/cm^–1	Transition	E′′/cm^–1	ϕ	γ₀(T₀)/10^–2cm^–1·atm^–1			β₀(T₀)/10^–2cm^–1·atm^–1		γ₂(T₀)/10^–2cm^–1·atm^–1
v₀/cm^–1	Transition	E′′/cm^–1	ϕ	CRDS	WM	HT	CRDS	WM	CRDS	WM
6371.299	R5	57.670	VP	6.26^b	6.23^b	6.29^a	—	—	—	—
			GP	6.43^b	6.48^b		2.84^c	2.90^d	—	—
			RP	6.47^b	6.50^b		2.57^c	2.67^d	—	—
			SDVP	6.50^b	6.55^b		—	—	0.87^c	0.77^d
6374.406	R6	80.735	VP	6.10^b	6.08^b	6.12^a	—	—	—	—
			GP	6.20^b	6.30^b		2.65^c	2.71^d	—	—
			RP	6.25^b	6.30^b		2.38^c	2.46^d	—	—
			SDVP	6.26^b	6.36^b		—	—	0.69^c	0.73^d
6377.407	R7	107.642	VP	5.97^b	5.94^b	5.99^a	—	—	—	—
			GP	6.07^b	6.12^b		2.22^c	2.48^d	—	—
			RP	6.10^b	6.17^b		2.06^c	2.36^d	—	—
			SDVP	6.25^b	6.24^b		—	—	0.71^c	0.71^d
6380.301	R8	138.390	VP	5.89^b	5.88^b	5.89^a	—	—	—	—
			GP	6.04^b	6.02^b		2.20^c	2.27^d	—	—
			RP	6.06^b	6.09^b		2.14^c	2.14^d	—	—
			SDVP	6.11^b	6.15^b		—	—	0.70^c	0.64^d
6383.090	R9	172.978	VP	5.80^b	5.78^b	5.80^a	—	—	—	—
			GP	5.91^b	6.03^b		2.08^c	2.11^d	—	—
			RP	5.94^b	6.03^b		1.89^c	1.85^d	—	—
			SDVP	5.97^b	6.09^b		—	—	0.61^c	0.63^d
6385.771	R10	211.404	VP	5.72^b	5.68^b	5.73^a	—	—	—	—
			GP	5.91^b	5.89^b		2.27^c	2.29^d	—	—
			RP	5.92^b	5.91^b		1.98^c	1.86^d	—	—
			SDVP	5.98^b	5.96^b		—	—	0.62^c	0.65^d
6388.347	R11	253.667	VP	5.62^b	5.58^b	5.67^a	—	—	—	—
			GP	5.91^b	5.80^b		2.62^c	2.21^d	—	—
			RP	5.93^b	5.82^b		2.15^c	2.00^d	—	—
			SDVP	5.95^b	5.89^b		—	—	0.77^c	0.67^d
注: WM代表WM-DAS, HT表示HITRAN^[36];^a表示相同温度(T₀= 288 K)下HITRAN的数据, 空气为背景气;^b不确定度 0—1%;^c不确定度 5%—15%;^d不确定度 10%—20%.

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Vol. 69, Issue 6 - 2020-03-20

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