Traceable Measurement of Optical Path Length of Gas Cell Based on Tunable Diode Laser Absorption Spectroscopy

Jiang-xiong LONG; Yu-jun ZHANG; Li SHAO; Qing YE; Ying HE; Kun YOU; Xiao-quan SUN

doi:10.3964/j.issn.1000-0593(2022)11-3461-06

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 11 >Page 3461 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 11, 3461 (2022)

Traceable Measurement of Optical Path Length of Gas Cell Based on Tunable Diode Laser Absorption Spectroscopy

Jiang-xiong LONG^1、*, Yu-jun ZHANG^{1、1; *;}, Li SHAO^{1、1; *;}, Qing YE^{1、1; 2;}, Ying HE^3、3;, Kun YOU^3、3;, and Xiao-quan SUN^{1、1; 2;}

Author Affiliations

¹1. State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei 230037, China

³3. Hefei Institutes of Physics Science, Chinese Academy of Sciences, Hefei 230031, China

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DOI: 10.3964/j.issn.1000-0593(2022)11-3461-06 Cite this Article

Jiang-xiong LONG, Yu-jun ZHANG, Li SHAO, Qing YE, Ying HE, Kun YOU, Xiao-quan SUN. Traceable Measurement of Optical Path Length of Gas Cell Based on Tunable Diode Laser Absorption Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2022, 42(11): 3461 Copy Citation Text

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Schematic diagram of setup for optical path measurement of gas cellDFB: distributed feedback; D: detector (InGaAs); VG: Vacuum gauge; BV: Ball valve; NV: Needle valve; GC: Gas cylinder

Fig. 1. Schematic diagram of setup for optical path measurement of gas cell
DFB: distributed feedback; D: detector (InGaAs); VG: Vacuum gauge; BV: Ball valve; NV: Needle valve; GC: Gas cylinder

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Fig. 2. Output wavenumber of DFB as a function of temperature and current

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Fig. 3. Detector signal and its baseline fitting at 74.2 torr and wavenumber corresponding to the sample point

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Fig. 4. (a) Spectral absorbance and qSDVP fitting, (b) VP fitting residual, (c) qSDVP fitting residual at 74.2 Torr

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Fig. 5. Integral absorbance A as a function of Γ and its general linear regression

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p/Torr	A_fit/cm^-1	RSU_fit/%	RSU_A/%
36.0	(6.527 8±0.023 1)×10^-4	0.35	0.49
48.7	(8.835 7±0.028 8)×10^-4	0.33	0.48
59.4	(1.076 4±0.003 4)×10^-3	0.32	0.47
74.2	(1.343 6±0.003 7)×10^-3	0.28	0.44

Table 1. Integral absorbance and corresponding RSU at various pressure

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Varible (Unit)	Value	RSU/%	Contribution to the uncertainty of L/%
A_fit/cm^-1	1.343 6×10^-3	0.28	29.10
K_n	1	0.34	43.98
$S_{1, T_{0}}$ /(cm·molecule^-1)	6.647×10^-24	0.15	8.38
K_1,_T	1.014 6	0.05	1.05
$S_{2, T_{0}}$ /(cm·molecule^-1)	9.768×10^-27	2	0.00
K_2,_T	0.973 6	0.05	0.00
p/Pa	9.892 5×10³	0.2	14.84
r_iso	1.000	0.05	0.92
$χ_{C O_{2}}$ /(mol·mol^-1)	1	0.001	0.00
T/K	294.2	0.07	1.72
k_B/(J·K^-1)	1.380 648 53×10^-23	0	0
L/cm	81.61±0.42	0.51

Table 2. Uncertainty budgets for optical path length L

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