N<sub>2</sub>O and CO Greenhouse Gas Measurements in Hollow Waveguides Based on Quantum Cascade Mid‑Infrared Coupling

Xi Yang; Hua Xia; Zhirong Zhang; PangTao; Wenbiao Huang; Bian Wu; Pengshuai Sun

doi:10.3788/CJL231529

Chinese Journal of Lasers, Volume. 51, Issue 17, 1711002(2024)

N₂O and CO Greenhouse Gas Measurements in Hollow Waveguides Based on Quantum Cascade Mid‑Infrared Coupling

Xi Yang^1,2, Hua Xia^2、*, Zhirong Zhang^1,2,3,4、**, PangTao², Wenbiao Huang², Bian Wu², and Pengshuai Sun²

¹School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, Anhui , China

²Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui , China

³Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui , China

⁴Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, Anhui , China

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Figures & Tables(9)

Fig. 1. Absorption spectra of N₂O, CO, and H₂O simulated by HITRAN database and relationship between wavenumber and current

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Fig. 2. Mid-infrared hollow waveguide gas sensor system

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Fig. 3. Second harmonic signals under different coupling methods

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Fig. 4. Lens focusing coupling of Gaussian beam

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$Second harmonic signals under different volume fractions. (a) N2O; (b) CO$

Fig. 5. Second harmonic signals under different volume fractions. (a) N₂O; (b) CO

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$Linear relationship between amplitude of second harmonic signal and volume fraction . (a) Amplitude of second harmonic signal versus number of sampling points for N2O with different volume fractions; (b) volume fraction of N2O versus amplitude of second harmonic signal; (c) amplitude of second harmonic signal versus number of sampling points for CO with different volume fractions; (d) volume fraction of CO versus amplitude of second harmonic signal$

Fig. 6. Linear relationship between amplitude of second harmonic signal and volume fraction . (a) Amplitude of second harmonic signal versus number of sampling points for N₂O with different volume fractions; (b) volume fraction of N₂O versus amplitude of second harmonic signal; (c) amplitude of second harmonic signal versus number of sampling points for CO with different volume fractions; (d) volume fraction of CO versus amplitude of second harmonic signal

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$Volume fractions measured continuously for 1 h and frequency distribution histograms. (a) Volume fraction of N2O;$

Fig. 7. Volume fractions measured continuously for 1 h and frequency distribution histograms. (a) Volume fraction of N₂O;

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Fig. 8. Allan deviation curves of system. (a) N₂O; (b) CO

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Table 1. σ values and signal-to-noise ratios of second harmonic signals

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Table 1. σ values and signal-to-noise ratios of second harmonic signals

Coupling method	σ /V	Signal-to-noise ratio
Original signal	0.00565	36.96
Lens signal	0.00371	93.99
Coupling with aperture of 2.0 mm	0.00461	32.67
Coupling with aperture of 1.5 mm	0.00426	29.61
Coupling with aperture of 1.2 mm	0.00269	36.77
Coupling with aperture of 1.0 mm	0.00230	31.43

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Xi Yang, Hua Xia, Zhirong Zhang, PangTao, Wenbiao Huang, Bian Wu, Pengshuai Sun. N₂O and CO Greenhouse Gas Measurements in Hollow Waveguides Based on Quantum Cascade Mid‑Infrared Coupling[J]. Chinese Journal of Lasers, 2024, 51(17): 1711002

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Paper Information

Category: spectroscopy

Received: Dec. 14, 2023

Accepted: Feb. 6, 2024

Published Online: Sep. 2, 2024

The Author Email: Xia Hua (zhangzr@aiofm.ac.cn), Zhang Zhirong (huaxia@aiofm.ac.cn)

DOI:10.3788/CJL231529

CSTR:32183.14.CJL231529

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology