Measurement of Carbon Isotopes in Methane Based on Off-Axis Integrated Cavity Output Spectroscopy Technology with Booster Optical Amplifier

Runqing Yu; Hua Xia; Pengshuai Sun; Tao Pang; Bian Wu; Zhirong Zhang

doi:10.3788/AOS231766

Acta Optica Sinica, Volume. 44, Issue 5, 0530001(2024)

Measurement of Carbon Isotopes in Methane Based on Off-Axis Integrated Cavity Output Spectroscopy Technology with Booster Optical Amplifier

Runqing Yu^1,2, Hua Xia^2,3,4、*, Pengshuai Sun², Tao Pang², Bian Wu², and Zhirong Zhang^1,2,3,4、**

Author Affiliations

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 Laboratory of Environmental Optics and 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, National University of Defense Technology, Hefei 230037, Anhui , China

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Figures & Tables(10)

Fig. 1. Simulation results of absorption spectra of CH₄ and its isotopes. (a) Simulation results under different pressures; (b) simulation results under different optical lengths

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Fig. 2. Simulation curves of CH₄, CO₂, and H₂O from 6028.2 cm^-1 to 6029.5 cm^-1

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Fig. 3. Measurement system of isotope ratio of CH₄ based on OA-ICOS

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Fig. 4. Control curves of pressure in the integrated cavity and gas change time. (a) Change curve of pressure; (b) precision of pressure control; (c) gas change time

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Fig. 5. Comparison of direct absorption spectra with different powers of RF white noise. (a) Absorption spectra; (b) enlarge image of ¹³CH₄ absorption spectrum peak; (c) enlarge image of spectral superposition peak of ¹²CH₄ and H₂O

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Fig. 6. Absorption spectra of stable isotopes in CH₄ with BOA. (a) Absorption spectra; (b) enlarge image of ¹³CH₄ absorption spectrum peak; (c) enlarge image of noise

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$CH4 absorption spectra in the volume fraction change of 100×10-6-1012×10-6. (a) Absorption spectra; (b) peak of 12CH4 absorption spectrum and volume fraction corresponding curve; (c) peak of 13CH4 absorption spectrum and volume fraction corresponding curve$

Fig. 7. CH₄ absorption spectra in the volume fraction change of 100×10^-6-1012×10^-6. (a) Absorption spectra; (b) peak of ¹²CH₄ absorption spectrum and volume fraction corresponding curve; (c) peak of ¹³CH₄ absorption spectrum and volume fraction corresponding curve

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$δ(13C) continuous measurement results of CH4 standard gas with volume fraction of 500×10-6. (a) δ(13C); (b) analysis of Allan variance$

Fig. 8. δ(¹³C) continuous measurement results of CH₄ standard gas with volume fraction of 500×10^-6. (a) δ(¹³C); (b) analysis of Allan variance

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Table 1. Output power of amplified laser corresponds to BOA drive current
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Table 1. Output power of amplified laser corresponds to BOA drive current
Current /mA Without BOA 200 300 400 500 600 650
Power /mW 3.1 9.3 23.1 38.1 51.1 62.4 67.5

Table 2. Volume fractions of ¹²CH₄ and ¹³CH₄ in CH₄ standard gases from 100×10^-6 to 1012×10^-6
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Table 2. Volume fractions of ¹²CH₄ and ¹³CH₄ in CH₄ standard gases from 100×10^-6 to 1012×10^-6
Volume fraction of
¹²CH₄ /10^-6
1000.13 899.45 790.62 691.79 592.96 494.14 395.31 296.48 197.66 98.83
Volume fraction of¹³CH₄ /10^-6 11.23 9.99 8.88 7.77 6.66 5.55 4.44 3.33 2.22 1.11

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Runqing Yu, Hua Xia, Pengshuai Sun, Tao Pang, Bian Wu, Zhirong Zhang. Measurement of Carbon Isotopes in Methane Based on Off-Axis Integrated Cavity Output Spectroscopy Technology with Booster Optical Amplifier[J]. Acta Optica Sinica, 2024, 44(5): 0530001

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Paper Information

Category: Spectroscopy

Received: Nov. 8, 2023

Accepted: Dec. 29, 2023

Published Online: Mar. 19, 2024

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

DOI:10.3788/AOS231766

CSTR:32393.14.AOS231766

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Output power of amplified laser corresponds to BOA drive current

Table 1. Output power of amplified laser corresponds to BOA drive current

Table 2. Volume fractions of 12CH4 and 13CH4 in CH4 standard gases from 100×10-6 to 1012×10-6

Table 2. Volume fractions of 12CH4 and 13CH4 in CH4 standard gases from 100×10-6 to 1012×10-6

Table 2. Volume fractions of ¹²CH₄ and ¹³CH₄ in CH₄ standard gases from 100×10^-6 to 1012×10^-6

Table 2. Volume fractions of ¹²CH₄ and ¹³CH₄ in CH₄ standard gases from 100×10^-6 to 1012×10^-6